GUAMA RIVER AND GUAJARA BAY, BELEM - AMAZON REGION
|
|
- Ira Evans
- 6 years ago
- Views:
Transcription
1 2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: Pb GEOCHRONOLOGY OF STREAM SEDIMENTS FROM THE GUAMA RIVER AND GUAJARA BAY, BELEM - AMAZON REGION Fabiana F. Dias 1*, Maria Helena T. Taddei 1, Suziane M. Nascimento 2, and Jean M. Lafon 2 1 Brazilian Nuclear Energy Commission - CNEN Poços de Caldas Laboratory Rodovia Poços de Caldas Andradas Km Poços de Caldas, MG - Brazil *fdias@cnen.gov.br mhtaddei@cnen.gov.br 2 Para Federal University Campus Universitário Rua Augusto Correa, 1 - Bairro do Guama Belem, PA - Brazil lafonjm@ufpa.br engsuzi@yahoo.com.br ABSTRACT This study was able to date three sediment profiles collected at the mouth of the Amazon river using the 210 Pb geochronology method. All sediment profiles were sliced into layers of 5 cm and each layer was analyzed for radionuclides by Gamma Spectrometry. The results obtained dated the sediments as far back as 65 years. In addition, the sedimentation rate was also determined. A subsequent interpretation of the results can provide information on pollutants present in the sediment layers and infer possible contamination patterns by operating industries and anthropogenic activities in the area of the Amazon Hydrographic Basin. 1. INTRODUCTION The 210 Pb dating method became the most important tool in sediment studies aimed at determining the absolute ages of modern sediments up to 100 years. The method is dependent on fractionation of nuclides from the 238 U decay chain (primarily 222 Rn) in rocks and soils next to the surface [1]. 222 Rn, an inert gas with a half life of 3.8 days, produced from the decay of 226 Ra, escapes from the earth surface to the atmosphere. Radon decay products (for which the longest half life son is 210 Pb, 22 years) are removed from the atmosphere composing a measurable source in the earth surface. The atmospheric 210 Pb is first removed from the atmosphere by precipitation through rain or dry deposition. The 210 Pb is then removed from the water column in aquatic systems by resident particles and deposited in sedimentation zones. By measuring 210 Pb and 226 Ra concentrations in sediment samples from lakes, reservoirs, estuarine and protected coastal
2 environments, it is possible to estimate the excess or non-supported concentration of 210 Pb in the sediment which is primarily derived from atmospheric flow. In areas where the excess 210 Pb deposition rate has been kept constant during the last century and there was not any sediment disturbance, the radionuclide concentration within the sediment core follows an exponential decrease with the depth that results from the radioactive decay. It is also considered that total 210 Pb present in the sediment is a sum of the fractions of 210 Pb atmospheric and 210 Pb in radiological equilibrium with 226 Ra [3]. 2. DISCUSSION Considering that the 210 Pb initial activity can be measured or estimated and considering that this activity is kept constant during the studied period, the residence time or the age of a certain deposit can be determined. Figure 1. Principles of 210 Pb dating [2]. In the CRS dating model (Constant Rate of Supply), also called the CF model (constant flux), the sedimentation rates are variable in time but the flux of 210 Pb to sediments remains constant. The excess 210 Pb profile vertically integrated to a depth x (or alternatively, cumulative dry-mass) will equal the flux (constant) integrated over the corresponding time interval [1]. The activity of 210 Pb atmospheric, after t years, is given by the radioactive decay equation: A = A 0. e -λ (210Pb). t (mbq g -1 ) [1]
3 In this work, the geochronology of the sediment from the Guama river and Guajara bay in Belem, at the mouth of the Amazon river, was obtained in order to determine the age of the sediment over a period of time of less than 100 years. Three sediment cores were taken from the studied area and sliced into 5 cm layers. Each layer was then analyzed for 210 Pb and 226 Ra by Gamma Spectrometry, in order to obtain 210 Pb atmospheric used as a dating tool. Table 1 below shows the corrected depth for each sediment layer and its associated age. Table 1. Data for Sediment Samples from the Guama river and Guajara bay. Sediment Core 1 Guajara Bay Corrected Depth (cm) Age (Years) DATE (Initial Date: 2006) Sediment Core 2 Guama river Corrected Depth (cm) Age (Years) DATE (Initial Date: 2006) Sediment Core 3 Guama river Corrected Depth (cm) Age (Years) DATE (Initial Date: 2006)
4 The Figures below show the geochronology method applied for the three sediment cores collected from the Guama river and Guajara bay. 3,6 3,4 3,2 3,0 Ln 210 Pb Atm 2,8 2,6 2,4 2,2 2,0 Linear Regression Y = A + B * X Parameter Value A 3,70215 B -0, Corrected Depth (cm) Figure 2. Depth versus Ln 210 Pb atmospheric for Sediment Core 1. 4,5 4,0 3,5 Ln 210 Pb Atm 3,0 2,5 2,0 Linear Regression Y = A + B * X Parameter Value A 4,47727 B -0, , Corrected Depth (cm) Figure 3. Depth versus Ln 210 Pb atmospheric for Sediment Core 2.
5 4,5 4,0 3,5 Ln 210 Pb Atm 3,0 2,5 2,0 1,5 Linear Regression Y = A + B * X Parameter Value A 4,28504 B -0, , Corrected Depth (cm) Figure 4. Depth versus Ln 210 Pb atmospheric for Sediment Core CONCLUSIONS It was possible to verify in this study that the geochronology method was adequate, useful, and very important to determine the age of sediment slices. Studies regarding sediments reflect an interest in understanding and finding solutions for present environmental problems as well as prediction of future problems; all of this based on knowledge of a recent past. Trace contaminant concentration profiles in sediment columns offer a natural archive with which pollution addition can be reconstructed. Immobilized species in the sedimentary environment don t necessarily remain in this condition; they can return to the water column as a result of chemical and physical alterations of the medium, making them available again. The reconstruction of historic addition of anthropogenic products or chemical elements such as heavy metals (potentially toxic metals) and organic pollutants is important for the improvement of management strategies and evaluation of the success of recent pollution control measures.
6 ACKNOWLEDGMENTS The authors would like to thank the technicians at the CNEN Poços de Caldas Laboratory and CNPq for sponsorship of the main author. REFERENCES 1. J. Carroll and I. Lerche. Sedimentary Processes: Quantification using Radionuclides. Radioactivity in the Environment. Volume 5. Elsevier. Kidlington, UK. (2003). 2. R. Cazotti. Geocronologia de Sedimentos Recentes com 210 Pb: Metodologia e Critérios para sua Aplicação em Lagos e Represas. Tese de Doutorado. Centro de Ciências Exatas e de Tecnologia. Departamento de Química. Universidade Federal de São Carlos. (2003). 3. E. D. Goldberg. Geochronology with Lead-210. Radioactive Dating - IAEA. Vienna. pp (1963).
Chapter 6: Chronology
6.1 21 Pb Sources and Pathways...48 6.2 Principles of 21 Pb Dating...48 6.3 Sediment Core Radionuclide Chronology...51 6.5 Sediment Core Trace Metal Chronology...57 47 6. Chronology The results from Chapter
More information(São Paulo, Brazil) Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP, Caixa Postal 11049, Pinheiros, São Paulo, Brasil 2
Journal of Radioanalytical and Nuclear Chemistry, Vol. 249, No. 1 (2001) 257 261 210Pb and 137 Cs geochronologies in the Cananeia-Iguape Estuary (São Paulo, Brazil) R. T. Saito, 1 R. C. L. Figueira, 2
More informationMATHEMATICAL MODEL OF RADON ACTIVITY MEASUREMENTS
2015 International Nuclear Atlantic Conference - INAC 2015 São Paulo, SP, Brazil, October 4-9, 2015 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-06-9 MATHEMATICAL MODEL OF RADON ACTIVITY
More informationAnalysis of the Gamma Spectrometry 210 Pb Radioisotope in River Bottom Sediments of the Hydrographic sub-basins Around the UTM-Caldas
Analysis of the Gamma Spectrometry 210 Pb Radioisotope in River Bottom Sediments of the Hydrographic sub-basins Around the UTM-Caldas Pedro H. Dutra¹; Carlos A. Carvalho Filho¹; Rubens M. Moreira¹; Maria
More informationUnderstanding the contribution of naturally occurring radionuclides to the measured radioactivity in AWE Environmental Samples
Understanding the contribution of naturally occurring radionuclides to the measured radioactivity in AWE Environmental Samples Dr Jonathan Burnett ASc Analytical Sciences PhD Supervisors Dr Richard Greenwood
More informationEXPERIMENTAL DETERMINATION OF NEUTRONIC PARAMETERS IN THE IPR-R1 TRIGA REACTOR CORE
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 EXPERIMENTAL DETERMINATION
More informationDEVELOPMENT OF A METHODOLOGY FOR LOW-ENERGY X-RAY ABSORPTION CORRECTION IN BIOLOGICAL SAMPLES USING RADIATION SCATTERING TECHNIQUES
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 DEVELOPMENT
More informationDetermination of natural radionuclides 40K, eu and eth in environmental samples from the vicinity of Aramar Experimental Center, Brazil
Determination of natural radionuclides 40K, eu and eth in environmental samples from the vicinity of Aramar Experimental Center, Brazil André Luis Lima de Araújo Marco Antônio Proença de Moraes Bruno Robles
More informationTHE PBIL ALGORITHM APPLIED TO A NUCLEAR REACTOR DESIGN OPTIMIZATION
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 THE PBIL ALGORITHM
More informationASSESSMENT OF NATURAL AND ARTIFICIAL RADIATION DOSE IN THE CITY URBAN AREA OF GOIÂNIA: RESULTS OF CAMPINAS- CENTRO AND SUL REGIONS
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 ASSESSMENT OF NATURAL AND
More informationEFFICIENCY SIMULATION OF A HPGE DETECTOR FOR THE ENVIRONMENTAL RADIOACTIVITY LABORATORY/CDTN USING A MCNP-GAMMAVISION METHOD
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 EFFICIENCY SIMULATION OF
More informationEnvironmental Applications
Environmental Applications Gamma ray Spectrometry Paul Nolan University of Liverpool Gamma ray spectrometry of environmental samples is a standard technique Germanium detector Programs available for spectrum
More informationIOP Conference Series: Earth and Environmental Science PAPER OPEN ACCESS
IOP Conference Series: Earth and Environmental Science PAPER OPEN ACCESS Technogenic and natural radionuclides in the bottom sediments of the Sea of Azov: regularities of distribution and application to
More informationFLUORINE IN WATER AND TEETH MEASURED WITH PIGE
2005 International Nuclear Atlantic Conference - INAC 2005 Santos, SP, Brazil, August 28 to September 2, 2005 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 85-99141-01-5 FLUORINE IN WATER AND TEETH
More informationDIFFERENCES IN TRACE ELEMENT CONCENTRATIONS IN WHOLE BLOOD OF SMALL SIZED ANIMALS USING ANAA
2005 International Nuclear Atlantic Conference - INAC 2005 Santos, SP, Brazil, August 28 to September 2, 2005 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 85-99141-01-5 DIFFERENCES IN TRACE ELEMENT
More informationAbsorbed Gamma Ray Doses due to Natural Radionuclides in Building Materials
Absorbed Gamma Ray Doses due to Natural Radionuclides in Building Materials Vitor A.P. Aguiar a, Nilberto H. Medina a, Ramon H. Moreira b, Marcilei A.G. Silveira b and José R.B. Oliveira a a Instituto
More informationINVESTIGATIONS OF THE FRICKE GEL (FXG) DOSIMETER DEVELOPED AT IPEN IRRADIATED WITH 60 Co GAMMA RAYS
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 INVESTIGATIONS OF
More informationGEMSTONE DEDICATED GAMMA IRRADIATOR DEVELOPMENT
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 GEMSTONE DEDICATED
More informationMultilayer Nuclear Track Detectors for Retrospective Radon Dosimetry
Multilayer Nuclear Track Detectors for Retrospective Radon Dosimetry V. V. Bastrikov 1, M. V. Zhukovsky 2 1 Experimental Physics Department, Ural State Technical University, Mira St., 19/5, 620002, Ekaterinburg,
More informationApplication of Mathematical Modeling to Study Flood Wave Behavior in Natural Rivers as Function of Hydraulic and Hydrological Parameters of the Basin
Hydrology Days 2010 Application of Mathematical Modeling to Study Flood Wave Behavior in Natural Rivers as Function of Hydraulic and Hydrological Parameters of the Basin Patrícia Freire Chagas 2, Silvia
More informationRisø-R-Report. DTU Nutech Report. Radioactivity in the Risø District January-June 2014
Risø-R-Report DTU Nutech Report Radioactivity in the Risø District January-June 2014 Sven P. Nielsen, Kasper G. Andersson and Arne Miller DTU-Nutech-9(EN) December 2014 Author: Sven P. Nielsen, Kasper
More informationPERFLUORINATED POLYMER GRAFTING: INFLUENCE OF PRE- IRRADIATION CONDITIONS
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 PERFLUORINATED
More informationMAXIMIZING SIGNAL-TO-NOISE RATIO (SNR) IN 3-D LARGE BANDGAP SEMICONDUCTOR PIXELATED DETECTORS IN OPTIMUM AND NON-OPTIMAL FILTERING CONDITIONS
9 International Nuclear Atlantic Conference - INAC 9 Rio de Janeiro,RJ, Brazil, September7 to October, 9 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-994-3-8 MAXIMIZING SIGNAL-TO-NOISE
More informationPRESSURE DROP OF FLOW THROUGH PERFORATED PLATES
27 International Nuclear Atlantic Conference - INAC 27 Santos, SP, Brazil, September 3 to October 5, 27 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-2-1 PRESSURE DROP OF FLOW THROUGH
More informationTHERMOLUMINESCENCE PROPERTIES OF OLIVINE
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 THERMOLUMINESCENCE PROPERTIES
More informationIn situ underwater gamma-ray spectrometry as a tool to study groundwater seawater interactions
A New Focus on Groundwater Seawater Interactions (Proceedings of Symposium HS1001 at IUGG2007, Perugia, July 2007). IAHS Publ. 312, 2007. 119 In situ underwater gamma-ray spectrometry as a tool to study
More informationTECHNIQUE OF MEASURING THE FIRST IONIZATION COEFFICIENT IN GASES
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 TECHNIQUE OF MEASURING
More informationNatural U-Th series radio-nuclides reveal important estuarine biogeochemical processes in the Delaware and Chesapeake Bays, USA
Presentation to the 10th IEBC Meeting Xiamen, CHINA, 21 May 2008 Natural U-Th series radio-nuclides reveal important estuarine biogeochemical processes in the Delaware and Chesapeake Bays, USA Thomas M.
More informationEVALUATION OF Ra, Th, K AND RADIUM EQUIVALENT ACTIVITY IN SAND SAMPLES FROM CAMBURI BEACH, VITÓRIA, ESPÍRITO SANTO, BRAZIL.
IX Latin American IRPA Regional Congress on Radiation Protection and Safety - IRPA 2013 Rio de Janeiro, RJ, Brazil, April 15-19, 2013 SOCIEDADE BRASILEIRA DE PROTEÇÃO RADIOLÓGICA - SBPR EVALUATION OF Ra,
More informationA TEMPERATURE DEPENDENT ENDF/B-VI.8 ACE LIBRARY FOR UO2, THO2, ZIRC4, SS AISI-348, H2O, B4C AND AG-IN-CD
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 A TEMPERATURE
More informationTHALES Project No. 65/1205
THALES Project No. 65/1205 Monte Carlo simulation of radioactivity γ-ray spectra recorded by a NaI detector in the marine environment Research Team C.T.Papadopoulos (P.I.), Assoc.Professor, Physics Department,
More informationAPPLICATION OF ADVANCED OXIDATIVE PROCESS IN TREATMENT RADIOACTIVE WASTE
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 APPLICATION
More informationRadioactivity in the Risø District July-December 2013
Downloaded from orbit.dtu.dk on: Jan 02, 2019 Radioactivity in the Risø District July-December 2013 Nielsen, Sven Poul; Andersson, Kasper Grann; Miller, Arne Publication date: 2014 Document Version Publisher's
More informationCALIBRATION OF IN VITRO BIOASSAY METHODOLOGY FOR DETERMINATION OF 131 I IN URINE
X Congreso Regional Latinoamericano IRPA de Protección y Seguridad Radiológica Radioprotección: Nuevos Desafíos para un Mundo en Evolución Buenos Aires, 12 al 17 de abril, 2015 SOCIEDAD ARGENTINA DE RADIOPROTECCIÓN
More informationBLOOD BIOCHEMISTRY EVALUATION IN HORSES HYPERIMMUNE SERA PRODUCTION
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 BLOOD BIOCHEMISTRY
More information10.4 Half-Life. Investigation. 290 Unit C Radioactivity
.4 Half-Life Figure Pitchblende, the major uranium ore, is a heavy mineral that contains uranium oxides, lead, and trace amounts of other radioactive elements. Pierre and Marie Curie found radium and polonium
More informationReactor Physics Calculations for a Sub critical Core of the IPEN-MB-01 driven by an external neutron source
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 Reactor Physics Calculations
More informationNorth-West University, Private Bag X2046, Mmabatho 2735, South Africa. 2. *Corresponding author:
Re-mobilization of uranium and thorium from sediments contaminated by naturally occurring radioactive material (NORM) through leaching by acid mine drainage (AMD). Faanhof A 1, Shongwe NS 2 and Connell,
More informationRadiological risk assessment to workers of a dicalciumphosphate industry
Radiological risk assessment to workers of a dicalciumphosphate industry 1 A. HIERRO 1,D. MULAS 1, G.TREZZI 1, N. CASACUBERTA 2, V. MORENO 1, P. MASQUÉ 1, J. GARCIA- ORELLANA 1 1 D E P A R T A M E N T
More informationDetermining the Need For External Radiation Monitoring at FUSRAP Projects Using Soil Characterization Data. Todd Davidson
Determining the Need For External Radiation Monitoring at FUSRAP Projects Using Soil Characterization Data Todd Davidson Introduction According to Regulatory Guide 8.34 Monitoring Criteria and Methods
More informationSOURCES of RADIOACTIVITY
Section 9: SOURCES of RADIOACTIVITY This section briefly describes various sources of radioactive nuclei, both naturally occurring and those produced artificially (man-made) in, for example, reactors or
More informationApplication of Fuzzy Set Theory to Flood Risk Analysis in Natural Rivers as a Function of Hydraulic Parameters
Hydrology Days 2010 Application of Fuzzy Set Theory to Flood Risk Analysis in Natural Rivers as a Function of Hydraulic Parameters Silvia Helena Santos 2,Patrícia Freire Chagas 2, Carla Freitas Andrade
More informationINTERNATIONAL ATOMIC ENERGY AGENCY DEPARTMENT OF NUCLEAR SCIENCES AND APPLICATIONS
INTERNATIONAL ATOMIC ENERGY AGENCY DEPARTMENT OF NUCLEAR SCIENCES AND APPLICATIONS Nuclear Techniques and Isotopes for the Protection of the Environment: IAEA Activities in support to Member States Maria
More informationPossible use of airborne radionuclide content in soil and biomonitors
Possible use of airborne radionuclide content in soil and biomonitors M. Krmar, D. Radnović 2, J. Hansman, N. Todorović, M. Velojić 3 Department of Physics, Faculty of Science, University Novi Sad, Novi
More informationEnvironmental Isotopes in Hydrology. Woocay substituting for Walton
Environmental Isotopes in Hydrology Oct 7, 2010 1 What is an Isotope? An element is defined by the number of protons (Z) in the nucleus The number of neutrons (N) defines the isotope(s) of that element
More informationRadioactivity in the Risø District January-June 2014
Downloaded from orbit.dtu.dk on: Dec 20, 2017 Radioactivity in the Risø District January-June 2014 Nielsen, Sven Poul; Andersson, Kasper Grann; Miller, Arne Publication date: 2014 Document Version Publisher's
More informationJúlio Takehiro Marumo. Nuclear and Energy Research Institute, IPEN CNEN/SP, Brazil
Júlio Takehiro Marumo Nuclear and Energy Research Institute, IPEN CNEN/SP, Brazil Introduction Brazil State of São Paulo City of São Paulo Reactor IEA-R1 Source: http://www.relevobr.cnpm.embrapa.br Source:
More informationYear 6. Geography. Revision
Year 6 Geography Revision November 2017 Rivers and World knowledge How the water cycle works and the meaning of the terms evaporation, condensation, precipitation, transpiration, surface run-off, groundwater
More informationAnalysis of gross alpha, gross beta activities and beryllium-7 concentrations in surface air: their variation and statistical prediction model
Iran. J. Radiat. Res., 2006; 4 (3): 155-159 Analysis of gross alpha, gross beta activities and beryllium-7 concentrations in surface air: their variation and statistical prediction model F.Arkian 1*, M.
More information17. Radiometric dating and applications to sediment transport
OCEAN/ESS 410 17. Radiometric dating and applications to sediment transport William Wilcock Lecture/Lab Learning Goals Understand the basic equations of radioactive decay Understand how Potassium-Argon
More information1 BASIC CONCEPTS AND MODELS
1 BASIC CONCEPTS AND ODELS 1.1 INTRODUCTION This Volume III in the series of textbooks is focused on applications of environmental isotopes in surface water hydrology. The term environmental means that
More informationActivity levels of gamma-emitters in Brazil nuts
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 04-01 (2016) 01-09 Activity levels of gamma-emitters in Brazil nuts M. J. A. Armelin a ; V. A. Maihara a ; S. M. F. Cozzolino b, P. S. C. Silva a and M. Saiki
More informationSTUDY ON TRACE ELEMENT DETERMINATION IN HUMAN HEAD HAIR USING NEUTRON ACTIVATION ANALYSIS
2007 International Nuclear Atlantic Conference - INAC 2007 Santos, SP, Brazil, September 30 to October 5, 2007 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-02-1 STUDY ON TRACE ELEMENT
More informationTable of Isotopic Masses and Natural Abudances
Table of Isotopic Masses and Natural Abudances in amu, where 1amu = 1/12 mass 12 C Atomic weight element = M i (abun i )+M j (abun j ) + Four types of radioactive decay 1) alpha (α) decay - 4 He nucleus
More informationCharacterising NORM hazards within subsea oil and gas facilities. Daniel Emes SA Radiation
Characterising NORM hazards within subsea oil and gas facilities. Daniel Emes SA Radiation What is in Oil and Gas NORM? Naturally Occurring Radioactive Material (NORM) can be characterized into many forms.
More information16. Radiometric dating and applications to sediment transport
16. Radiometric dating and applications to sediment transport William Wilcock OCE/ESS 410 Lecture/Lab Learning Goals Understand the basic equations of radioactive decay Understand how Potassium-rgon dating
More informationDetermination of the concentration of natural and artificial radionuclides in the soil of the Campus of the Federal University of Sergipe
SCIENTIA PLENA VOL. 7, NUM. 1 2011 www.scientiaplena.org.br Determination of the concentration of natural and artificial radionuclides in the soil of the Campus of the Federal University of Sergipe L.
More informationRadiation Protection Dosimetry (2011), Vol. 144, No. 1 4, pp Advance Access publication 30 November 2010
Radiation Protection Dosimetry (2011), Vol. 144, No. 1 4, pp. 124 129 Advance Access publication 30 November 2010 doi:10.1093/rpd/ncq412 ACCREDITATION AND TRAINING ON INTERNAL DOSIMETRY IN A LABORATORY
More informationDetermination of Particle Size Distribution of Water-Soluble CdTe Quantum Dots by Optical Spectroscopy
Electronic Supplementary Material (ESI) for RSC Advances. This journal is The Royal Society of Chemistry 2014 Determination of Particle Size Distribution of Water-Soluble CdTe Quantum Dots by Optical Spectroscopy
More informationSurface Processes Focus on Mass Wasting (Chapter 10)
Surface Processes Focus on Mass Wasting (Chapter 10) 1. What is the distinction between weathering, mass wasting, and erosion? 2. What is the controlling force in mass wasting? What force provides resistance?
More informationGAMMA RADIATION MEASUREMENTS IN SELECT SAND SAMPLES FROM CAMBURI BEACH-VITÓRIA, ESPÍRITO SANTO, BRAZIL: PRELIMINARY RESULTS
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 GAMMA RADIATION MEASUREMENTS
More informationNuclear forces and Radioactivity. Two forces are at work inside the nucleus of an atom
Nuclear forces and Radioactivity Two forces are at work inside the nucleus of an atom Forces act in opposing directions Electrostatic repulsion: pushes protons apart Strong nuclear force: pulls protons
More informationStudy of Number of photons at axis Shower with different de/dx and Fluorescence Yield
Study of Number of photons at axis Shower with different de/dx and Fluorescence Yield Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-170, Santo André, SP, Brazil E-mail: toderocj@ufabc.edu.br
More informationMAPPING THE EXPOSURE OF THE BRAZILIAN POPULATION TO NATURAL BACKGROUND RADIATION COSMIC RADIATION
IX Latin American IRPA Regional Congress on Radiation Protection and Safety - IRPA 2013 Rio de Janeiro, RJ, Brazil, April 15-19, 2013 SOCIEDADE BRASILEIRA DE PROTEÇÃO RADIOLÓGICA - SBPR MAPPING THE EXPOSURE
More informationThe analysis of cessium-137 activity of sediment surface by gamma spectroscopy methods on dry season at Cilacap Donan Estuarine 2014
SC.179 Proceedings of the IConSSE FSM SWCU (2015), pp. SC.179 183 ISBN: 978-602-1047-21-7 The analysis of cessium-137 activity of sediment surface by gamma spectroscopy methods on dry season at Cilacap
More informationRadioactivity in the Risø District January-June Risø-R-Report. DTU Nutech Report
Radioactivity in the Risø District January-June 2012 Risø-R-Report DTU Nutech Report Sven P. Nielsen, Kasper G. Andersson and Arne Miller DTU-Nutech-R-0003(EN) December 2012 Author: Sven P. Nielsen, Kasper
More informationRadioactivity measurements and risk assessments in soil samples at south and middle of Qatar
Radioactivity measurements and risk assessments in soil samples at south and middle of Qatar A. T. Al-Kinani*, M. A. Amr**, K. A. Al-Saad**, A. I. Helal***, and M. M. Al Dosari* *Radiation and Chemical
More informationIntercomparison of alpha and gamma spectrometry techniques used in 210 Pb geochronology
Journal of Environmental Radioactivity 93 (2007) 38e50 www.elsevier.com/locate/jenvrad Intercomparison of alpha and gamma spectrometry techniques used in 210 Pb geochronology Agata Zaborska a, *, JoLynn
More informationGEOL 562 Notes: U-Series and Th-series nuclides. Guide Questions: Reading: White, Lecture 10
GEOL 562 Notes: U-Series and Th-series nuclides Reading: White, Lecture 10 Motivation: Up to now we have dealt with long half-life nuclides (all left over from the birth of the solar system). What are
More informationSix decades of environmental radioactivity measurements. Sven P. Nielsen
Six decades of environmental radioactivity measurements Sven P. Nielsen Research Establishment Risø Established by Government in 1950 s to keep Denmark in line with development of nuclear technology including
More informationRadioactivity measurements for the ERMES project at the STELLA facility
EPJ Web of Conferences 24, 02002 (2012) DOI: 10.1051/ epjconf/ 20122402002 C Owned by the authors, published by EDP Sciences - SIF, 2012 Radioactivity measurements for the ERMES project at the STELLA facility
More informationQuestions. 1. What kind of radiation dominates the first phase of radiation emission from a nuclear fireball?
Questions 1. What kind of radiation dominates the first phase of radiation emission from a nuclear fireball? 2. What is the ignition temperature of wood? 3. What fuels a firestorm? Natural Radioactivity
More informationTHERMAL STRATIFICATION MONITORING OF ANGRA 2 STEAM GENERATOR MAIN FEEDWATER NOZZLES
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 THERMAL STRATIFICATION
More informationNuclear Spectroscopy: Radioactivity and Half Life
Particle and Spectroscopy: and Half Life 02/08/2018 My Office Hours: Thursday 1:00-3:00 PM 212 Keen Building Outline 1 2 3 4 5 Some nuclei are unstable and decay spontaneously into two or more particles.
More informationDistribution of Radionuclide Concentration with Proximity to the Lagoon in Lagos State, Southwestern Nigeria
Distribution of Radionuclide Concentration with Proximity to the Lagoon in Lagos State, Southwestern Nigeria Abstract T. J Ojo* B. O Afolayan Physics Unit of Science Technology Department, Federal Polytechnic,
More informationPRELIMINARY CONCEPT OF A ZERO POWER NUCLEAR REACTOR CORE
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte,MG, Brazil, October 24-28, 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 PRELIMINARY CONCEPT OF
More informationUniversidade de São Paulo, Centro de Energia Nuclear na Agricultura, Laboratório de Ecologia Isotópica, Piracicaba, São Paulo, Brazil.
Marine and Freshwater Research, 2018, 69, 1397 1407 CSIRO 2018 Supplementary material Comparison of microbial processing of Brachiaria brizantha, a C4 invasive species and a rainforest species in tropical
More informationTHERMAL HYDRAULIC MODELING OF THE LS-VHTR
2013 International Nuclear Atlantic Conference - INAC 2013 Recife, PE, Brazil, November 24-29, 2013 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-05-2 THERMAL HYDRAULIC MODELING OF
More informationActive concentration for material not requiring radiological regulation
Translated English of Chinese Standard: GB27742-2011 www.chinesestandard.net Sales@ChineseStandard.net Wayne Zheng et al. ICS 17. 240 F 70 GB National Standard of the People s Republic of China Active
More informationMECHANICAL AND THERMAL PROPERTIES OF COMMERCIAL MULTILAYER PET/PP FILM IRRADIATED WITH ELECTRON-BEAM
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 MECHANICAL AND
More informationMicro Squall Line in Belem region. Tarcísio Miranda do Amaral Neto (1) Júlia Clarinda Paiva Cohen (1) Luiz Augusto Toledo Machado (2)
1 Micro Squall Line in Belem region Tarcísio Miranda do Amaral Neto (1) Júlia Clarinda Paiva Cohen (1) Luiz Augusto Toledo Machado (2) (1) Universidade Federal do Para, Belém, Brasil. (2) Centro de Previsão
More informationSTRONTIUM ISOTOPES AS NATURAL TRACERS IN RESERVOIR OILFIELD AND IN GROUNDWATER SYSTEMS
009 International Nuclear Atlantic Conference - INAC 009 Rio de Janeiro, RJ, Brazil, September7 to October, 009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-994-0-8 STRONTIUM ISOTOPES AS
More informationGamma spectrometry for chronology of recent sediments Tracing human induced climate change in NW Africa
Gamma spectrometry for chronology of recent sediments Tracing human induced climate change in NW Africa D. Pittauerová a, S. Mulitza b, H.W. Fischer a a b Institute of Environmental Physics, University
More informationRADIOACTIVITY IN CHEMICAL FERTILIZERS
RADIOACTIVITY IN CHEMICAL FERTILIZERS Milica M. Rajačić, Nataša B. Sarap, Marija M. Janković, Jelena D. Nikolić, Dragana J. Todorović and Gordana. Pantelić Institute for Nuclear Sciences "Vinča", University
More informationPete Burgess, Nuvia Limited. Clearance and exemption
Pete Burgess, Nuvia Limited Clearance and exemption The clearance, exclusion and exemption process Most of the UK nuclear industry (and many other organisations) refer to the Clearance and Exemption Working
More informationGus MacKenzie. Scottish Universities Environmental Research Centre
From Lucas cells to AMS: 40 years of environmental radioactivity research Gus MacKenzie Scottish Universities Environmental Research Centre University of Glasgow Key dates in developments in radioactivity
More informationTechnical Memorandum No Sediment Model
Pajaro River Watershed Study in association with Technical Memorandum No. 1.2.9 Sediment Model Task: Development of Sediment Model To: PRWFPA Staff Working Group Prepared by: Gregory Morris and Elsie Parrilla
More informationRadionuclides in food and water. Dr. Ljudmila Benedik
Radionuclides in food and water Dr. Ljudmila Benedik ISO-FOOD WP 3 and WP4 WP 3 Research and education P1 Food authenticity P2 Translation of regional isotopic and elemental signatures from natural environment
More informationIsotopic tracers in Oceanography
Isotopic tracers in Oceanography Isotopic tracers in oceanography Pathways of different trace metals from their sources to their sinks M. Frank: Reviews of Geophysics, vol. 40 DOI: 10.1029/2000RG000094
More informationCALIBRATION OF INSTRUMENTS MEASURING RADON OVER A LARGE ACTIVITY RANGE. N. Michielsen, V. Voisin
Radon in the Living Environment, 011 CALIBRATION OF INSTRUMENTS MEASURING RADON OVER A LARGE ACTIVITY RANGE N. Michielsen, V. Voisin Institut de Protection et de Sûreté Nucléaire, Département de Prévention
More informationRadiological Characterization of Buildings at the Ranstad Uranium Works
Radiological Characterization of Buildings at the Ranstad Uranium Works Report presented at the Workshop on Radiological Characterization for Decommissioning Studsvik, Nyköping, Sweden 17 19 April 2012
More informationMonte Carlo Simulations for a Preliminary Design of TRIGA IPR-R1 PGAA Facility
J. Chem. Chem. Eng. 10 (2016) 256-270 doi: 10.17265/1934-7375/2016.06.002 Monte Carlo Simulations for a Preliminary Design of TRIGA IPR-R1 PGAA Facility D DAVID PUBLISHING Bruno Teixeira Guerra 1, 2, Alexandre
More informationDetermination of uranium concentration in ground water samples of Northern Greece
EPJ Web of Conferences 24, 03005 (2012) DOI: 10.1051/ epjconf/ 20122403005 C Owned by the authors, published by EDP Sciences - SIF, 2012 Determination of uranium concentration in ground water samples of
More informationAN ANALYTICAL SOLUTION FOR THE TWO-GROUP KINETIC NEUTRON DIFFUSION EQUATION IN CYLINDRICAL GEOMETRY
2011 International Nuclear Atlantic Conference - INAC 2011 Belo Horizonte, MG, Brazil, October 24-28 2011 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-04-5 AN ANALYTICAL SOLUTION
More informationCURRENT CAPABILITIES OF THE IRD-CNEN WHOLE BODY COUNTER FOR IN VIVO MONITORING OF INTERNALLY DEPOSITED RADIONUCLIDES IN HUMAN BODY
International Joint Conference RADIO 2014 Gramado, RS, Brazil, Augustl 26-29, 2014 SOCIEDADE BRASILEIRA DE PROTEÇÃO RADIOLÓGICA - SBPR CURRENT CAPABILITIES OF THE IRD-CNEN WHOLE BODY COUNTER FOR IN VIVO
More informationNear-Earth Supernovae Probed by Deep-Sea Deposits of Radioactive 60 Fe
Near-Earth Supernovae Probed by Deep-Sea Deposits of Radioactive 60 Fe Sara Ayoub PHY802-SP16 Final Presentation Abstract After decades of lack of precision in estimating the frequency of supernovae and
More informationRadon escape from mine tailings dams. Robbie Lindsay + Joash Ongori (PhD student) Co-authors Prof Richard Newman/Dr Peane Maleka
Radon escape from mine tailings dams Robbie Lindsay + Joash Ongori (PhD student) (rlindsay@uwc.ac.za) Co-authors Prof Richard Newman/Dr Peane Maleka What is the radon problem in South Africa? Not in houses
More informationUSING FUZZY LOGIC TO ASSIST IN PERFORMANCE ASSESSMENT OF A NUCLEAR WASTE REPOSITORY
USING FUZZY LOGIC TO ASSIST IN PERFORMANCE ASSESSMENT OF A NUCLEAR WASTE REPOSITORY ABSTRACT F. Luiz de Lemos Centro de Desenvolvimento da Tecnologia Nuclear/CNEN, Brazil T. Sullivan Brookhaven National
More informationNuclear Chemistry. Nuclear Terminology
Nuclear Chemistry Up to now, we have been concerned mainly with the electrons in the elements the nucleus has just been a positively charged things that attracts electrons The nucleus may also undergo
More informationRichárd Kardos, 1 Borbála Máté, 1 Mária Horváth, 2 Anita Csordás, 1 Tibor Kovács
1 Richárd Kardos, 1 Borbála Máté, 1 Mária Horváth, 2 Anita Csordás, 1 Tibor Kovács 1 III. Terrestrial Radionuclides in Environment International Conference on Environmental Protection Veszprém, May 16-18,
More information