Particle Analysis Finding the Needle in the Haystack
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1 JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 1 Particle Analysis Finding the Needle in the Haystack Nicole Erdmann,, Magnus Hedberg Nuclear Safeguards and Security Unit - ITU Available from:
2 Nuclear Safeguards & Security Unit JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 2 Traditional Safeguards - Nuclear material accountancy (owner) Isotope & Element Assay EURATOM - Independent verification (Euratom, IAEA,...) LIS Strengthened Safeguards Particle HPTA Method - Verify completeness of declaration (Add. Protocol) - Absence of undeclared activities Illicit trafficking and nuclear forensics - Detection Chemical Analysis - Source attribution Macroscopic Parameters Microscopic Parameters Reference Data?
3 Support for DG-TREN and IAEA JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 3 Examples of JRC/ITU support to DG-TREN and the IAEA: Management of the On-site laboratories at La Hague and Sellafield for DG-TREN. Analysis of HPTA SIMS samples and training of staff for DG-TREN and the IAEA. Analysts from ITU provided in-field analytical measurement support to joint DG-TREN/IAEA inspection teams at European fuel fabrication plants. Analysis of nuclear samples for DG-TREN and the IAEA. Support to the IAEA s operation at Rokkasho and Training of IAEA staff for work at Rokkasho OSL. 25 year celebration of EC support to the IAEA (2006)
4 Strengthened Safeguards - HPTA JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 4 Basis of the High Performace Trace Analysis (HPTA) method: Fine particulate material or aerosols are often released in trace amounts during the handling of nuclear material they are representative of the original material their composition provides specific information about the source they are highly mobile and can be found in many locations at a facility They are not detected by conventional techniques and pose no health risk It is difficult to clean up and remove the released particles Samples taken at a facility that has been operated over a long period can provide an insight into the entire history of the operation Highly sensitive techniques required! SEM picture of uranium particles. (H. Thiele ITU)
5 Swipe sampling JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 5 Swipe Samples are taken by Safeguards Inspectors at the facilities At IAEA/Euratom headquarters, samples are anonymised, coded, then sent to the analytical labs Analytical lab has no info of sample origin!!!!
6 The Analytical Challenge JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 6 Why measure single particles? To obtain information that gets lost/obscured by measuring the bulk average: particle-particle change in chemical composition particle-particle change in isotopic composition (1) PuO 2 platelets (2) PuO 2 rods (3) U 3 O 8 hexagons
7 The Analytical Challenge JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 7 Main objectives in particle analysis: Search through millions of particles to find the particles of interest ( needle in the haystack ) Perform analysis under strict time pressure Precise and accurate measurements of isotopic ratios on smallest particles possible Particle distribution. (Resolution 1050x and 3500x).
8 Particle analysis JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 8 Isotopic Analysis of Uranium Particles Method and equipment Preparation of HPTA samples for SIMS at the ITU Clean Laboratory. Particle isotopic analysis with SIMS. (Cameca 4FE6)
9 Particle analysis JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 9 Principle of SIMS: bombardment of sample with highenergy ion beam detection of secondary ions Analytical information: Mass spectrum (= isotopic fingerprint) Ion image Depth profiles, etc m/z=238
10 Particle analysis JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 10 Isotopic analysis of particles from a swipe sample (enrichment plant for power reactor fuel)
11 New developments JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security atom % IMS 4F atom % Cameca 1280 LG-SIMS. Cameca 4F 236/235 data + background interference. 236 atom % IMS atom % Cameca /235 data (interference free) Aim to constantly improve the performance of particle analysis Measure not only major isotopes ( 235 U/ 238 U) but also minor isotopes ( 236 U, 234 U, they contain information about uranium origin and production process) Large Geometry (LG) SIMS significantly improves timeliness, sensitivity and quality of the data
12 Detailed LG-SIMS evaluation JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 12 Detailed evaluation of LG-SIMS performance by ITU Significant improvement in sensitivity and accuracy of minor isotope data Results have recently been published Results have been provided to IAEA Y. Ranebo et al. Improved isotopic SIMS measurements of uranium particles for nuclear safeguard purposes, J. Anal. At. Spectrom., 2009, 24,
13 Particle analysis JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 13 Main conclusion: A change towards LG-SIMS will significantly improve the quality and reliability of the particle analysis Finding a uranium particle in a matrix of other material is approximately 10 times faster The sensitivity of the instrument will also improve about 10 times, allowing for smaller particles to be analysed In total, the switch from SG-SIMS to LG-SIMS is a major step forward for the work of verifying the absence of non-declared nuclear activities Both ITU and the IAEA s laboratories are planning to establish LG-SIMS facilities in the near future.
14 Further Improvements in particle analysis JRC-ITU Karlsruhe - 19 March 2009 Nuclear Security 14 Improve sampling. Improve sample preparation. Three ongoing projects to improve particle analysis: 1. Investigate the fundamental mechanisms in uranium aerosol particle release and mobility for optimising the sampling techniques. Automated software for SIMS 2. Improve sample preparation methods to enhance the sensitivity in finding the U particles of interest in a large matrix of other materials. 3. Ongoing development project with the company Cameca to create a new dedicated software package for SIMS analysis that will significantly improve the performance on particle analysis.
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