ENTRY 30791 20211108 32033079100000001 SUBENT 30791001 20211108 32033079100100001 BIB 13 68 3079100100002 INSTITUTE (3CHFTHU,3SARRIY) 3079100100003 TITLE Cumulative yields of short-lived fission products in 3079100100004 thermal-neutron fission of 235U 3079100100005 AUTHOR (C.Chung,A.A.Hasan,S.Sahin) 3079100100006 REFERENCE (J,RCA,37,131,1984) experimental details, data 3079100100007 (C,85SANTA,1,529,1985) brief, same data as 3079100100008 Radiochim. Acta 37,131 3079100100009 (J,RE,93,193,1986) A.A.Hasan+, same data 3079100100010 (C,87ROSSEA,,(H3),1987) C.Chung, abstract 3079100100011 FACILITY (REAC,3CHFTHU). 1 MW open pool type 'THOR' 3079100100012 INC-SPECT Thermal reactor neutron spectrum with a cadmium ratio 3079100100013 of 10:1 (determined by gold foil). To reduce dead-time 3079100100014 loss during counting, THOR was operated at a power of 3079100100015 500 watts only, yielding fission rates in the target of3079100100016 around 10E+7 fissions/sec. 3079100100017 SAMPLE 3.5 mg of 93% enriched U-235 metal foil, sealed in 3079100100018 polyethylene bag. 3079100100019 METHOD To avoid loss of gaseous fission products, the sample 3079100100020 was not removed from the polyethylene bag during the 3079100100021 experiment. The sample was irradiated, together with a 3079100100022 fission track detector, for 11 sec, then transported in3079100100023 a polyethylene carrier to the measuring position. 3079100100024 (FISCT,FPGAM) fission track etch method combined with 3079100100025 rapid gamma-ray spectroscopy. 3079100100026 (GSPEC) 3079100100027 DETECTOR (GELI) The counting system consisted of a 50 ccm Ge(Li)3079100100028 detector connected to a TN-1710 2048-channel analyzer 3079100100029 coupled to an Apple-II PC. The system resolution was 3079100100030 2.4 keV FWHM at 1332 keV. The detector efficiency in 3079100100031 the range 80-2000 keV was calibrated using sets of IAEA3079100100032 and NBS standard sources. 3079100100033 12 consecutive gamma-spectra were collected. 3079100100034 (TRD) The fission track detection system consisted of 3079100100035 0.003 inch thick 93% enriched U-235 metal foils backed 3079100100036 on polycarbonate as fission track detector, calibrated 3079100100037 in the thermal column of THOR. The detector was etched 3079100100038 in NaOH.Fission tracks were counted under a microscope.3079100100039 ANALYSIS Fission yields were obtained from measured photopeak 3079100100040 areas (from which activities were deduced) and fission 3079100100041 rates (deduced from the measured total number of 3079100100042 fissions = 6.7E+7) using standard equations for growth 3079100100043 and decay. 3079100100044 (DECAY) 3079100100045 CORRECTION Gamma-ray spectrometry: 3079100100046 - gamma-ray emission probability 3079100100047 - efficiency of detection system 3079100100048 - interfering gamma-rays from other fission products 3079100100049 (the list is given under DECAY-DATA, taken from 3079100100050 table 3 of Radiochimica Acta 37(1985)131) 3079100100051 Growth and decay during irradiation and cooling time, 3079100100052 taking into account differences in cumulative yields 3079100100053 of parent and daughter products. 3079100100054 ERR-ANALYS (ERR-T) Total yield error (8.7-33.0%) 3079100100055 The total error was calculated as the square 3079100100056 root of the sum of squares of individual 3079100100057 errors (Compiler's comment: irrespective of 3079100100058 their random or systematic nature). 3079100100059 The errors are given as one standard deviation:3079100100060 - gamma-ray intensity (3.9-12.0%) 3079100100061 - gamma counting statistics (2.1-31.6%) 3079100100062 (ERR-1) detection efficiency (4.5%) 3079100100063 (ERR-2) fission track counting (5.0%) 3079100100064 (ERR-3) sample weight (3.1%) 3079100100065 HISTORY (20010515C) ML. 3079100100066 (20081107U) On. 002 corrected (heading) 3079100100067 (20211018A) VS. References RE,93,193,1986 and 3079100100068 87ROSSEA,,(H3),198 added. 3079100100069 DATA-MIN and DATA-MAX added in 002. 3079100100070 ENDBIB 68 0 3079100100071 COMMON 4 3 3079100100072 EN-DUMMY ERR-1 ERR-2 ERR-3 3079100100073 EV PER-CENT PER-CENT PER-CENT 3079100100074 0.0253 4.5 5.0 3.1 3079100100075 ENDCOMMON 3 0 3079100100076 ENDSUBENT 75 0 3079100199999 SUBENT 30791002 20211108 32033079100200001 BIB 5 60 3079100200002 REACTION (92-U-235(N,F)ELEM/MASS,CUM,FY,,MXW) 3079100200003 DECAY-DATA ((1.)35-BR-89,4.37SEC) Ref.1 3079100200004 ((1.)36-KR-89,190.8SEC,DG,220.9,0.201) Ref.1 3079100200005 ((2.)35-BR-90,1.96SEC) Ref.1 3079100200006 ((2.)36-KR-90,32.3SEC,DG,120.9/121.8,0.355) Ref.1 3079100200007 ((3.)52-TE-136,17.5SEC) Ref.1 (decay branching to 3079100200008 I-136m not known, see FLAG) 3079100200009 ((3.)53-I-136-M,44.8SEC,DG,381.4,0.998) Ref.1 3079100200010 ((4.)53-I-137,24.5SEC) Ref.1 3079100200011 ((4.)54-XE-137,229.2SEC,DG,455.5,0.31) Ref.1 3079100200012 ((5.)53-I-139,2.30SEC) Ref.1 3079100200013 ((5.)54-XE-139,39.7SEC,DG,218.6,0.50) Ref.1 3079100200014 ((6.)54-XE-140,13.6SEC) Ref.1 3079100200015 ((6.)55-CS-140,65.5SEC,DG,602.3,0.72) Ref.1 3079100200016 ((7.)56-BA-144,11.5SEC) Ref.2 3079100200017 ((7.)57-LA-144,39.7SEC,DG,397.4,0.90) Ref.3 3079100200018 ((8.)57-LA-148,1.05SEC) Ref.4 3079100200019 ((8.)58-CE-148,56.SEC,DG,269.5,0.170, 3079100200020 DG,291.7,0.167) Ref.4 3079100200021 Relative uncertainties of gamma-ray intensities (as 3079100200022 calculated by compiler from absolute uncertainties 3079100200023 given by the authors): 3079100200024 Kr-89: 12% Kr-90: 8.5% I-136m: 5.5% 3079100200025 Xe-137: 10% Xe-139: 6.0% Cs-140: 4.2% 3079100200026 La-144: 5.6% Ce-148: 5.3% and 4.8%% 3079100200027 References: 3079100200028 1: C.M.Lederer, V.S.Shirley, Table of Isotopes, 3079100200029 7th ed., Wiley Inc., NY, 1978 3079100200030 2: C.Chung et al, Phys.Rev.C 26(1982)1198 3079100200031 3: W.B.Walters, priv. comm. 1985 3079100200032 4: R.L.Gill et al, Phys.Rev.C 27(1983)1732 3079100200033 5: N.K.Aras et al, Can.J.Chem. 61(1983)780 3079100200034 List of gamma-rays interfering with measured ones: 3079100200035 Measured Interfering 3079100200036 nuclide keV keV nuclide intensity half-life 3079100200037 Kr-89 220.9 220.5 U-239 0.0026 412 sec 3079100200038 Kr-90 121.8 121.8 Pm-152 0.16 246 sec 3079100200039 I-136m 381.4 382.3 Sb-132m 0.080 168 sec 3079100200040 Xe-137 455.5 453.8 Pr-146 0.48 1440 sec 3079100200041 Xe-139 218.6 218.2 Ce-146 0.22 790 sec 3079100200042 Cs-140 602.3 601.8 Xe-139 0.047 39.7 sec 3079100200043 La-144 397.4 396.4 Xe-138 0.062 850 sec 3079100200044 Ce-148 269.5 270.1 Tc-106 36 sec 3079100200045 Ce-148 291.7 291.5 Ba-143 0.072 17.0 sec 3079100200046 291.7 291.7 Ba-144 0.028 11.5 sec 3079100200047 FLAG At the time of the experiment, the decay branching of 3079100200048 Te-136 to the I-136 isomers was unknown. Therefore two 3079100200049 values have been calculated for the I-136m cumulative 3079100200050 fission yield, distinguished by the FLAG. 3079100200051 Compiler's comment: at the time of compilation we know 3079100200052 from the current 'Nuclear Data Sheets' and 'Table of 3079100200053 Isotopes' that there is no branching of Te-136 3079100200054 to I-136m, and hence the second value is correct. 3079100200055 (1.) assuming 100% decay of Te-136 to 44.8 sec I-136m 3079100200056 =upper limit (Compiler's comment: wrong value) 3079100200057 (2.) assuming 100% decay of Te-136 to 83.4 sec I-136g 3079100200058 =lower limit (Compiler's comment: correct value) 3079100200059 STATUS (TABLE) Table 5 of Radiochim. Acta 37(1985) 131 3079100200060 HISTORY (20081107U) On. DATA-ERR -> ERR-T 3079100200061 (20211018A) VS. DATA-MIN and DATA-MAX added. 3079100200062 ENDBIB 60 0 3079100200063 NOCOMMON 0 0 3079100200064 DATA 9 9 3079100200065 MASS ELEMENT ISOMER DATA DATA-MIN DATA-MAX 3079100200066 ERR-T DECAY-FLAG FLAG 3079100200067 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS PC/FIS 3079100200068 PC/FIS NO-DIM NO-DIM 3079100200069 89. 36. 5.26 3079100200070 1.13 1. 3079100200071 90. 36. 5.04 3079100200072 0.63 2. 3079100200073 136. 53. 1. 1.50 3079100200074 0.17 3. 1. 3079100200075 136. 53. 1. 0.93 3079100200076 0.10 3. 2. 3079100200077 137. 54. 6.94 3079100200078 0.89 4. 3079100200079 139. 54. 5.47 3079100200080 1.80 5. 3079100200081 140. 55. 4.18 3079100200082 0.37 6. 3079100200083 144. 57. 4.63 3079100200084 0.47 7. 3079100200085 148. 58. 2.42 3079100200086 0.23 8. 3079100200087 ENDDATA 22 0 3079100200088 ENDSUBENT 87 0 3079100299999 ENDENTRY 2 0 3079199999999