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1 M L M 1379 (tr) L O W ENERGY GAMMATRANSITIONS IN P u AND G. G. Akalaev, N. A. Vartanov, and P. S. Samoilov ' Translated by K. W. Foster AEC Research and Development REPORT MONSANTO RESEARCH CORPORATION A S U B S I D I A R Y M O U N.D MlAMlSBU RG, OHIO 0 1 M O N S A N T O C O M P A N Y L A B 0 R A T 0 R Y OPERATED FOR UNITED STATES ATOMIC ENERGY COMMISSION US.GOVERNMENT CONTRACT NO. AT33lGENS3
2 LEGAL NOTICE This report w a s prepared as an account of Government sponsored work. Neither the United States. nor the Commission. nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or implied, with respect to the accuraw, completeness. or usefulness of the information contained in this report. or that the use of any information. apparatus, method. or process disclosed in this report may not infringe privately owned rights: or B. Assumes my liabilities with respect to the use of. or for damages resulting from the use of any informrtion. appcuatus. method. or process disclosed in this report. As used in the above. "person acting on behalf of the Commission" includes any employee or contractor of the Commission. or employee of such contractor. to the extent that such employee or contractor of the Commisslon. or employee of such contractor prepares. disseminates. or provides access to. any information pursuant to his employment oc colttract with the Commiselon. or his employment with such contractor.
3 MLM 1379 (tr) LOW ENERGY GAMMATRANSITIONS IN P u AND P u G. G. Akalaev N. A. Vartanov P. S. Samoilov issued: March 27, 1967 Translated by K. W. Foster From Atomnaya Energiya (USSR) 16, 452 (May, 1964). Copyright releases have not been obtained from the publisher or the authors. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. M O N S A N T O R E S E A R C H C O R P O RAT10 N A Subsidiary of Monsanto Company MOUND LABORATORY Miamisburg, Ohio UNITED operated for STATES ATOMIC ENERGY COMMISSION US. GOVERNMENT CONTRACT NO. AT.33.1.GEN.53
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5 The radioactive nuclei curium242 and curium244 transform by alpha decay into the long lived isotopes plutonium238 and plutonium240. Fundamental radiation data about energy levels of the nuclei plutonium238 and plutonium240 of these isotopes are in the literature.is However, in these works there has been no comparison of internal conversion coefficients of gamma transitions of the plutonium nuclei with theoretical values of internal conversion coefficients for L and M subshells of the atoms. Such a comparison should reveal possible anomolous internal conversion coefficients of accelerated E2transitions in strongly deformed nuclei.3 The gamma emission spectra of isotopes curium242 and curium244 have not been analyzed in published works. Moreover, such an analysis would indicate the degree of separation of curium from other radioactive products generated in the process of its produc tion. In order. to obtain the indicated information, we investigated electron and gamma spectra of mixtures of isotopes of curium; this was done on a beta spectrometer with double focusing at an angle of, IT a and on a scintillation gamma spectrometep with a 4Ox40mm NaI(T1) single crystal detector. The preparation containing the mixture of curium isotopes was. deposited on a celluloid film 0.1 thick in the form of a little strip 1.5x35mm and coated with a semitransparent layer of Aquadag. The copnter window was 2x35 mm and was covered by a celluloid film 0.05 thick which permitted the system to count electrons starting with an energy of 1 KeV. The electron spectrum was measured in interval numbers from 90 to 1250 oerstedcm, which corresponds to electron energies of 0.8 to 120 KeV. The observed electron lines are interpolated in Table 1. NOTE: Manuscript received by the editor, Sept. 19,
6 Table 1 INTERPRETATION OF LINES I N THE ELECTRON SPECTRUM OF PLUXINIUM238 AND PLUTONIUM240 L i n e Number i n Spectrum , 0, 0, Conversion Shell Transition Energy (KeV) Ll Ll I Li I I Mi MI I+MI I I (CII?*) MI I I N Average Ll Ll I Ll I I MI MI I,+Mi I ( C m 4 2 ) N Average Auger Electrons : 0, 04 Electron Energy (KeV) Auger Electrons Auger Electrons Auger Electrons Os Auger E l e c t r o n s M, L, , 6: NJNk LJM, MJM, Mi L, Intensity of L i n e (rel. u n i t s ) I I M,MJ Llll, I I MiMJ L, MJM, L, MJNk Remarks P e r t a i n s t o Cm242 Pertains to m 2
7 I n Table 2 experimental r e s u l t s of,the r a t i o of conversion a t L and M subshells a r e compared with t h e o r e t i c a l values taken from the l i t e r a t u r e. A s i t i s seen from the t a b l e s, experimental values of the conversion c o e f f i c i e n t s L I I : L, I and MI I :MII agree with t h e o r e t i c a l values within a precision of 5 10%., Since the observed i n t e n s i t y of the weak l i n e L, includes the contribution of Auger e l e c t r o n s, i t does not seem possible t o disengage accurately i t s t r u e i n t e n s i t y. I n addition t o the l i n e s considered i n Table 1, t w o more l i n e s were a l s o observed i n the spectrum with energies of 72 and 5 KeV. F o r the purpose of i d e n t i f i c a t i o n of these l i n e s a gamma spectrum of the sample was measured i n which gamma l i n e s are observed a t 45, 123, 248, 385, 720, 873, 1003, and 1280 KeV, which a r e a t t r i b u t e d t o europium155. From anal.ysis of the e l e c tron and gamma spectra i t i s seen t h a t the sample i n question contains, besides the isotopes curium242 and curium244, the impurities europium154 and europium155. The e l e c t r o n l i n e s a t 72 and 5 K e V are due t o conversion of gamma t r a n s i t i o n energies a t 123 KeV i n the K and L subshells of gadolinium. The Auger e l e c t r o n l i n e s were not q u a n t i t a t i v e l y interpreted i n the present work. 5
8 Table 2 RATIO OF INTERNAL CONVERSION. COEFFICIENTS E2 TRANSITIONS WITH ENERGY 43 AND 44 KEV, FOR Z = 94 Ratio Theore tical Values Ref ere nc e s 6 & 7 Present Work 43 KeV 44 KeV Experimental Values Reference 2 Reference 3 43 KeV 44 KeV 43 KeV 44 KeV Ll ILI I I /1.27 MI I :MI I I L:M:N.2.27: l:? 2.3:1: : 1: :1: :1: :1:0.3
9 REFERENCES 1. S. A. Baranov and K. N. Shlyagin, At. Energ;., l., 52 (1956). 2. W. Smith and J. Hollander, Phys. Rev., 101, 746 (1956). 3. M. A. Listengarten, Izv. Akad. Nauk SSSR, Ser. Fiz., (1962). J 4. P. S. Samoilov, Pribory i Tekhn. Eksperim., 6, 33 (1959). 5. Compilation work of some problems of radiometry and dosimetry Atomizdat.,1960, p. 6. of ionizing radiations. 6. L. A. Sliva and I. M. Band, "Tables of Coefficients of Internal Conversion Gammarays LSubshells," Press Akad. Nauk, SSSR, Gamma Rays, ed. L o A. Sliva, Press Akad. Nauk, SSSR, 1961, p
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