ENTRY 30948 20010419 00003094800000001 SUBENT 30948001 20010419 00003094800100001 BIB 9 25 3094800100002 INSTITUTE (3INDTRM) 3094800100003 REFERENCE (J,NUK,9,43,1967) 3094800100004 AUTHOR (A.V.Jadhav,M.V.Ramaniah,C.L.Rao,C.J.Shahani) 3094800100005 TITLE Cumulative yields of Mo99,Rh105 and Te132 in the 3094800100006 spontaneous fission of U238 3094800100007 SAMPLE natural uranium in the form of pure ammonium diuranate 3094800100008 METHOD (RCHEM) For spontaneous fission measurements, large 3094800100009 amounts of uranium are required. Initial separation: 3094800100010 by sulphide precipitation from a UO2Cl2 solution in 3 M3094800100011 HCl. Further purification was carried out using 3094800100012 standard radiochemical procedures. 3094800100013 (ABSFY) Absolute fission yields were obtained from the 3094800100014 fission product activities in equilibrium with the 3094800100015 spontaneous fission rate. The latter was determined 3094800100016 from the sample weight and the spontaneous fission half3094800100017 life of U-238. 3094800100018 DETECTOR (GEMUC) Flat circular gas-flow Geiger Mueller counter, 3094800100019 1.12% ethylene in argon; background: 0.7+-0.1 cpm. 3094800100020 CORRECTION Since natural uranium was used, the contribution from 3094800100021 U-235 fission induced by U-238 spontaneous fission 3094800100022 neutrons was calculated to be about 5%, and it was 3094800100023 concluded that no correction was necessary. 3094800100024 HISTORY (19881017T) automatic conversion from Rider file, 3094800100025 reference 67JAD1 3094800100026 (20010419A) ML:additional information from publication.3094800100027 ENDBIB 25 0 3094800100028 NOCOMMON 0 0 3094800100029 ENDSUBENT 28 0 3094800199999 SUBENT 30948002 20010419 00003094800200001 BIB 4 12 3094800200002 REACTION (92-U-238(0,F)ELEM/MASS,CUM,FY) 3094800200003 ANALYSIS Each nuclide was determined 3 times. 3094800200004 (DECAY) The decay curves were analysed and the half 3094800200005 lives obtained were 66,36 and 78 hrs for Mo-99,Rh-105 3094800200006 and Te-132 respectively, in good agreement with the 3094800200007 recommended values in the Nuclear Data Sheets. 3094800200008 The latter were used for least squares analysis of the3094800200009 counting data to obtain the equilibrium count rate. 3094800200010 ASSUMED The spontaneous fission half life of U-238 used in the 3094800200011 calculation of fission yields was (8.04+-0.3)10**15 yr,3094800200012 taken from E.Segre,Phys.Rev.86(1952)21. 3094800200013 STATUS Data taken from the table in Nukleonik 9(1967)43. 3094800200014 ENDBIB 12 0 3094800200015 NOCOMMON 0 0 3094800200016 DATA 5 3 3094800200017 ELEMENT MASS ISOMER DATA DATA-ERR 3094800200018 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS 3094800200019 42. 99. 6.94 1.02 3094800200020 45. 105. 0. 1.15 0.18 3094800200021 52. 132. 4.0 0.6 3094800200022 ENDDATA 5 0 3094800200023 ENDSUBENT 22 0 3094800299999 ENDENTRY 2 0 3094899999999