ENTRY 32632 20101207 31473263200000001 SUBENT 32632001 20101207 31473263200100001 BIB 15 39 3263200100002 TITLE Determination of the Mo-99 cumulative yield from U-235 3263200100003 fission induced by spontaneous fission neutrons of 3263200100004 Cf-252. 3263200100005 AUTHOR (Wang Dao,Tang Peijia,Ju Changxin,Liu Daming, 3263200100006 Wang Qing) 3263200100007 INSTITUTE (3CPRAEP) 3263200100008 REFERENCE (J,HFH,7,(4),234,198511) 3263200100009 SAMPLE Enriched metallic uranium (more than 90% of 3263200100010 U-235), 16mm diameter, weight (1.0-1.5) g/cm2 3263200100011 FACILITY (REAC) Light-water swimming-pool reactor and 3263200100012 heavy-water reactor 3263200100013 INC-SOURCE Spontaneous fission neutrons of Cf-252 source used for 3263200100014 measured reaction.The neutron intensity was 5. x 10**7 3263200100015 neutrons/4Pi/sec, thermal neutrons from thermalizing 3263200100016 column used for thermal irradiation. 3263200100017 METHOD (RVAL) The following formula were used: 3263200100018 Y(x1)=r(x)*Y(x2)*(Y(S1)/Y(S2)) 3263200100019 R(x)=(a(x1)*a(S2))/(a(x2)*a(S1)) 3263200100020 here Y=absolute yield, a=decay rate, 3263200100021 x=measured nuclide, S=standard nuclide, 3263200100022 1=measured reaction, 2=standard reaction. 3263200100023 DETECTOR (GELI) A 130 cm2 high resolution coaxial Ge(Li) 3263200100024 detector together with SCORPIO-3000 Multi Channel- 3263200100025 Computer system used for fission products gamma ray 3263200100026 spectrum measurement.The resolution (FWHM) was 2.0 keV 3263200100027 at 1.332 MeV of Co-60,efficiency more than 30 percent. 3263200100028 MONITOR ((MONIT1)92-U-235(N,F)42-MO-99,CUM,FY,,MXW) 3263200100029 ((MONIT2)92-U-235(N,F)40-ZR-95,CUM,FY,,MXW) 3263200100030 ((MONIT3)92-U-235(N,F)40-ZR-95,CUM,FY,,FIS) 3263200100031 MONIT-REF (,Yang Yan,J,CST,15,(4),483,198107) For monitor 1 and 23263200100032 monitor 3 was evaluated by author. 3263200100033 CORRECTION Made for fission products of U-238 in the sample 3263200100034 induced by fission neutrons and gamma rays 3263200100035 self-absorption in the sample. 3263200100036 ERR-ANALYS (DATA-ERR) Total error including the errors of 3263200100037 gamma peak and standard yield was given. 3263200100038 STATUS (TABLE) Data taken from J.HFH,vol.7,No.4,p.234,(1985). 3263200100039 HISTORY (19951110C) Compiled by Liang Qichang,CNDC. 3263200100040 (20100219A) SD:Updated to new date formats,lower case. 3263200100041 ENDBIB 39 0 3263200100042 COMMON 6 3 3263200100043 MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR MONIT3 MONIT3-ERR 3263200100044 PC/FIS PER-CENT PC/FIS PER-CENT PC/FIS PER-CENT 3263200100045 6.14 1.1 6.50 1.2 6.35 1.6 3263200100046 ENDCOMMON 3 0 3263200100047 ENDSUBENT 46 0 3263200199999 SUBENT 32632002 20101207 31473263200200001 BIB 2 5 3263200200002 REACTION (92-U-235(N,F)42-MO-99,CUM,FY,,FIS) 3263200200003 COMMENT The R value measured in this paper was 1.025(1+-1.7%) 3263200200004 together with the standard fission yields given in 3263200200005 common Table. The measured Mo-99 cumulative yield was 3263200200006 obtained. 3263200200007 ENDBIB 5 0 3263200200008 NOCOMMON 0 0 3263200200009 DATA 3 1 3263200200010 EN-MEAN DATA DATA-ERR 3263200200011 MEV PC/FIS PER-CENT 3263200200012 2.13 6.12 2.8 3263200200013 ENDDATA 3 0 3263200200014 ENDSUBENT 13 0 3263200299999 ENDENTRY 2 0 3263299999999