ENTRY 23562 20200415 22872356200000001 SUBENT 23562001 20200415 22872356200100001 BIB 13 32 2356200100002 TITLE Absolute fission-yields of 99Mo and 139Ba in the 2356200100003 thermal neutron fission of 235U 2356200100004 AUTHOR (H.R.von Gunten, H.Hermann) 2356200100005 REFERENCE (J,RCA,8,112,1967) 2356200100006 INSTITUTE (2SWTWUR) 2356200100007 FACILITY (REAC,2SWTWUR) Heavy water reactor DIORIT 2356200100008 INC-SOURCE (REAC) 2356200100009 INC-SPECT Thermal neutron flux ~4.E+08 n/cm2/sec (measured by 2356200100010 gold foils); 2356200100011 epithermal flux ~2.E+07 n/cm2/sec (measured by gold in 2356200100012 cadmium); 2356200100013 fast flux ~6.E+07 n/cm2/sec (phosphor monitor). 2356200100014 Additional D2O moderator was inserted in 6 runs for 2356200100015 neutron thermalization. 2356200100016 Neutron flux was stable within +-2.%. 2356200100017 SAMPLE Electroplated deposits of 29mm diameter, 2356200100018 0.08 - 0.2 mg of 235U (99.5%). 2356200100019 DETECTOR Al parallel plate type fission counter, lined with 2356200100020 Al foil of ~4.5 mg/cm2 thickness. 2356200100021 (PROPC) End-window proportional counter for Ba-139, 2356200100022 calibrated with Y-90 standards. 2356200100023 METHOD (CHSEP) 2356200100024 (GSPEC) Gamma spectrometry for Mo-99 by calibrated 2356200100025 (with Mo-99 standard) single and multichannel 2356200100026 analyzers. 2356200100027 COMMENT Of authors. Decay constants from: 2356200100028 W.Seelmann-Eggebert+, Charts of Nuclides, 2356200100029 Federal Minister of Nuclear Energy, federal Republic of2356200100030 Germany, 1961 2356200100031 CORRECTION For 3 microsec dead time of counter. 2356200100032 For chemical yields. 2356200100033 HISTORY (20200415C) M.M. 2356200100034 ENDBIB 32 0 2356200100035 COMMON 1 3 2356200100036 EN-DUMMY 2356200100037 EV 2356200100038 0.0253 2356200100039 ENDCOMMON 3 0 2356200100040 ENDSUBENT 39 0 2356200199999 SUBENT 23562002 20200415 22872356200200001 BIB 6 50 2356200200002 REACTION (92-U-235(N,F)42-MO-99,(CUM),FY) 2356200200003 DECAY-DATA (42-MO-99,,DG,140.) 2356200200004 ANALYSIS Area under 0.14 MeV photopeak of Tc-99-M was 2356200200005 calculated. 2356200200006 Average value of several runs: 2356200200007 (1.) Irradiation 5812 min 2356200200008 Absolute fis.rate 550218 fis./min 2356200200009 Mo-99 activity at end of irradiation 21463 dis./min 2356200200010 (2.) Irradiation 4230 min 2356200200011 Absolute fis.rate 508110 fis./min 2356200200012 Mo-99 activity at end of irradiation 16221 dis./min 2356200200013 (3.) Irradiation 3975 min 2356200200014 Absolute fis.rate 464484 fis./min 2356200200015 Mo-99 activity at end of irradiation 14394 dis./min 2356200200016 (4.) Irradiation 3753 min 2356200200017 Absolute fis.rate 487560 fis./min 2356200200018 Mo-99 activity at end of irradiation 14767 dis./min 2356200200019 Value not used for average, impure sample 2356200200020 (5.) Irradiation 4480 min 2356200200021 Absolute fis.rate 503454 fis./min 2356200200022 Mo-99 activity at end of irradiation 16776 dis./min 2356200200023 (6.) Irradiation 5035 min 2356200200024 Absolute fis.rate 561786 fis./min 2356200200025 Mo-99 activity at end of irradiation 20511 dis./min 2356200200026 (7.) Irradiation 5015 min 2356200200027 Absolute fis.rate 627408 fis./min 2356200200028 Mo-99 activity at end of irradiation 21801 dis./min 2356200200029 (8.) Irradiation 3915 min 2356200200030 Absolute fis.rate 226836 fis./min 2356200200031 Mo-99 activity at end of irradiation 6803 dis./min 2356200200032 Additional D2O moderator 2356200200033 (9.) Irradiation 4311 min 2356200200034 Absolute fis.rate 300036 fis./min 2356200200035 Mo-99 activity at end of irradiation 9667 dis./min 2356200200036 Additional D2O moderator 2356200200037 (10.) Irradiation 5375 min 2356200200038 Absolute fis.rate 706080 fis./min 2356200200039 Mo-99 activity at end of irradiation 20216 dis./min 2356200200040 Additional D2O moderator 2356200200041 REL-REF (A,,C.D.Correl+,B,RCS,,,1951) 6.2 2356200200042 (A,13374002,J.Terrell+,J,PR,92,1091(I4),1953) 2356200200043 6.14+-0.16 2356200200044 (A,,G.W.Reed+,J,PR,92,1473,1953) 5.98+-0.18 2356200200045 (A,,E.P.Steinberg+,C,55GENEVA,7,3,1955) 6.1 2356200200046 (A,,M.P.Anikina+,C,58GENEVA,15,446,1958) 6.25+-0.19 2356200200047 (A,,S.Katcoff+,J,NUC,18,(11),2002,1960) 6.06 2356200200048 (A,,H.W.Walker,R,AECL-1054,1960) 6.3 2356200200049 (A,,H.Farrar+,J,CJP,40,1017,1962) 6.25 2356200200050 ERR-ANALYS (DATA-ERR) Standard deviation 2356200200051 STATUS (TABLE) Table 1 of Radiochimica Acta,v.8,p.112,1967 2356200200052 ENDBIB 50 0 2356200200053 NOCOMMON 0 0 2356200200054 DATA 2 1 2356200200055 DATA DATA-ERR 2356200200056 PC/FIS PC/FIS 2356200200057 6.16 0.08 2356200200058 ENDDATA 3 0 2356200200059 ENDSUBENT 58 0 2356200299999 SUBENT 23562003 20200415 22872356200300001 BIB 6 26 2356200300002 REACTION (92-U-235(N,F)56-BA-139,(CUM),FY) 2356200300003 DECAY-DATA (42-MO-99,,DG,140.) 2356200300004 ANALYSIS Average value of several runs, each 90 min irradiation2356200300005 (1.) Absolute fis.rate 635376 fis./min 2356200300006 Mo-99 activity at end of irradiation 22100 dis./min 2356200300007 (2.) Absolute fis.rate 537144 fis./min 2356200300008 Mo-99 activity at end of irradiation 18172 dis./min 2356200300009 (3.) Absolute fis.rate 559296 fis./min 2356200300010 Mo-99 activity at end of irradiation 19003 dis./min 2356200300011 Additional D2O moderator 2356200300012 (4.) Absolute fis.rate 610260 fis./min 2356200300013 Mo-99 activity at end of irradiation 20455 dis./min 2356200300014 Additional D2O moderator 2356200300015 (5.) Absolute fis.rate 561402 fis./min 2356200300016 Mo-99 activity at end of irradiation 19286 dis./min 2356200300017 Additional D2O moderator 2356200300018 REL-REF (A,,C.D.Correl+,B,RCS,,,1951) 6.3 2356200300019 (A,,G.W.Reed+,J,PR,92,1473,1953) 6.4+-0.2 2356200300020 (A,,E.P.Steinberg+,C,55GENEVA,7,3,1955) 6.2 2356200300021 (A,,A.P.Baerg+,J,CJC,35,980,1957) 6.57+-0.02 2356200300022 (A,,M.P.Anikina+,C,58GENEVA,15,446,1958) 6.3+-0.3 2356200300023 (A,,S.Katcoff+,J,NUC,18,(11),2002,1960) 6.55 2356200300024 (A,,H.W.Walker,R,AECL-1054,1960) 6.4 2356200300025 (A,,H.Farrar+,J,CJP,40,1017,1962) 6.42 2356200300026 ERR-ANALYS (DATA-ERR) Standard deviation 2356200300027 STATUS (TABLE) Table 2 of Radiochimica Acta,v.8,p.112,1967 2356200300028 ENDBIB 26 0 2356200300029 NOCOMMON 0 0 2356200300030 DATA 2 1 2356200300031 DATA DATA-ERR 2356200300032 PC/FIS PC/FIS 2356200300033 6.55 0.10 2356200300034 ENDDATA 3 0 2356200300035 ENDSUBENT 34 0 2356200399999 ENDENTRY 3 0 2356299999999