ENTRY 30575 20040714 00003057500000001 SUBENT 30575001 20040714 00003057500100001 BIB 14 77 3057500100002 TITLE Absolute yields of short-lived fission products in the 3057500100003 thermal neutron induced fission of 235U and 239Pu 3057500100004 AUTHOR (A.Ramaswami,V.Natarajan,R.H.Iyer) 3057500100005 INSTITUTE (3INDTRM) 3057500100006 REFERENCE (J,JIN,42,(9),1213,198009) Main publication 3057500100007 (P,BARC-1114,78,1981)Same data as main publication 3057500100008 (P,BARC-1126,10,198106) Brief, no data 3057500100009 (C,79JUELICH,,(C22),197905)Synopsis only,no data 3057500100010 (C,78BOMBAY,2,233,1978)Experiment described,superseded 3057500100011 SAMPLE A known weight (not given in the paper) of the fissile 3057500100012 material solution was sealed in a polypropylene tube. 3057500100013 MONITOR Absolute measurement: an accurately diluted portion of 3057500100014 the sample solution was sealed together with a thin 3057500100015 mica strip in a polypropylene tube for determination of3057500100016 the number of fissions.no weight or dimension is given.3057500100017 FACILITY (REAC,3INDTRM).CIRUS,natural uranium fuel,candu type. 3057500100018 pneumatic irradiation facility. 3057500100019 INC-SPECT Thermal reactor neutrons.No other information given. 3057500100020 METHOD 'Track-etch-cum-gamma-ray spectrometry' 3057500100021 The monitor was irradiated together with the sample 3057500100022 fission track counting using an optical microsope. The 3057500100023 track density was detrmined by scanning a small 3057500100024 representative area of the mica detector. 3057500100025 Direct gamma-ray spectrometry of unseparated fission 3057500100026 products for the determination of the number of 3057500100027 fission product atoms.The whole sample was measured 3057500100028 starting immediately after irradiation. gamma spectra3057500100029 were taken at every 2 minutes interval. 3057500100030 DETECTOR (TRD).Thin mica strip 3057500100031 The track registration efficiency has been determined 3057500100032 by two independent methods: 3057500100033 - direct comparison with the number of fissions in a 3057500100034 thin target-detector assembly 3057500100035 - accurate measurement of the thermal neutron flux. 3057500100036 (GELI).of 60 ccm,coupled to a 4096 channel analyser. 3057500100037 The calibrated system was used in an international 3057500100038 intercomparison of gamma-ray emission rate measurements3057500100039 which has proven the correctness of the efficiency curv3057500100040 ANALYSIS The total number of fissions was derived from the 3057500100041 fission track density,taking inot account: 3057500100042 - weight of the fissile material 3057500100043 - efficiency for track registration in solution 3057500100044 - concentration of the target material in solution 3057500100045 gamma-ray spectra were analyzed by a computer program 3057500100046 with automatic peak location and integration. 3057500100047 The formula given for the calculation of fission yields3057500100048 from measured fission product activities does not 3057500100049 include any precursors. 3057500100050 Compilers comment: this may be problematic in the case 3057500100051 of 89Rb, 104Ru, 138Cs, 139Ba and 142La,as the half- 3057500100052 lives of their precursors are comparable to the cooling3057500100053 time (and possibly also to the irradiation time,which 3057500100054 is not given),and in 2 cases (89Kr, 138Xe) they are 3057500100055 also comparable to those of their daughters. 3057500100056 ERR-ANALYS (ERR-S) Statistical error (1 sigma) 3057500100057 (ERR-T) Total error: sum of random error and total 3057500100058 systematic error. 3057500100059 Systematic error: composed of e.g.(listed in paper): 3057500100060 - error in Ge(Li)-detector efficiency calibration 3057500100061 - error in track counting 3057500100062 - errors in nuclear decay data 3057500100063 The accuracy of the Ge(Li) efficiency calibration,as 3057500100064 derived from the international intercomparison (see 3057500100065 'detector'),is about 1 % from 300 to 1500 kev. 3057500100066 COMMENT Cooling time: the transportation of the sample from the3057500100067 irradiation to the measurment position took almost 3057500100068 10 minutes.(improvements are planned.) 3057500100069 A separate sample (diluted to reduce the track density)3057500100070 had to be used for recording the number of fissions, 3057500100071 which had an additional uncertainty due to volume 3057500100072 correction. 3057500100073 A comparison of the decay data used with the data file 3057500100074 of A.Tobias (UK,1977) shows a number of discrepancies3057500100075 for gamma-ray abundances,as indicated with the decay-3057500100076 data,which are a major source of error. 3057500100077 HISTORY (19871203C) ML 3057500100078 (20040311U) SD: corrected 4-dig. year and lower cases. 3057500100079 ENDBIB 77 0 3057500100080 COMMON 1 3 3057500100081 EN-MEAN 3057500100082 EV 3057500100083 0.025 3057500100084 ENDCOMMON 3 0 3057500100085 ENDSUBENT 84 0 3057500199999 SUBENT 30575002 19871214 00003057500200001 BIB 4 34 3057500200002 REACTION (92-U-235(N,F)ELEM/MASS,CUM,FY,,SPA) 3057500200003 DECAY-DATA ((1.)36-KR-85-M,4.48HR,DG,151.18,0.746) See correction 3057500200004 ((2.)36-KR-87,76.3MIN,DG,402.58,0.494) 3057500200005 ((3.)36-KR-88,2.80HR,DG,196.31,0.263) Discrepancy:17% 3057500200006 ((4.)37-RB-89,15.15MIN,DG,1031.88,0.6358) 3057500200007 ((5.)38-SR-92,2.71HR,DG,1383.94,0.90) 3057500200008 ((6.)38-SR-93,7.3MIN,DG,590.2,0.677) See correction 3057500200009 ((7.)43-TC-104,18.2MIN,DG,357.99,0.9033) Discrepancy:8%3057500200010 ((8.)52-TE-134,41.8MIN,DG,767.2,0.3063) Discrepancy:13%3057500200011 ((9.)52-TE-134,41.8MIN) Precursor of 134I 3057500200012 ((9.)53-I-134,52.6MIN,DG,847.02,0.954) 3057500200013 ((10.)53-I-135,6.7HR,DG,1260.5,0.3028) 3057500200014 ((11.)55-CS-138,32.2MIN,DG,1435.86,0.763) 3057500200015 ((12.)56-BA-139,1.39HR,DG,165.8,0.188) Discrepancy:20% 3057500200016 see also correction 3057500200017 ((13.)56-BA-141,18.0MIN,DG,190.22,0.4401) See correctio3057500200018 discrepancy:11% 3057500200019 ((14.)57-LA-142,92.7MIN,DG,641.7,0.4901) 3057500200020 Discrepancy: see comment in Subentry 1. 3057500200021 The data were taken from the compilation of J.Blachot 3057500200022 and C.Fiche,Atomic and Nuclear Data tables 20(1977)241.3057500200023 CORRECTION For interfering gamma-rays from other fission products:3057500200024 NUCLIDE INTERFERING GAMMA-RAY(S) 3057500200025 85mKr 149.8 kev from 131Te 3057500200026 93Sr 590.8 kev from 101Mo 3057500200027 139Ba 164.6 kev and 169.0 kev from 133mTe 3057500200028 141Ba 191.9 kev from 101Mo 3057500200029 peaks were generally resolved by making use of 3057500200030 differences in half-lives following the decay.Only 3057500200031 in the case of 141Ba and interfering 101Mo with a 3057500200032 comparable half-life,a one step radiochemical 3057500200033 purification of barium had to be performed before 3057500200034 gamma counting.this included 139Ba. 3057500200035 STATUS (TABLE) Data taken from table 1 of first reference 3057500200036 ENDBIB 34 0 3057500200037 NOCOMMON 0 0 3057500200038 DATA 7 14 3057500200039 ELEMENT MASS ISOMER DATA ERR-S ERR-T 3057500200040 DECAY-FLAG 3057500200041 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS PER-CENT 3057500200042 NO-DIM 3057500200043 36. 85. 1. 1.26 0.01 4.0 3057500200044 1. 3057500200045 36. 87. 2.48 0.12 6.2 3057500200046 2. 3057500200047 36. 88. 2.86 0.16 6.8 3057500200048 3. 3057500200049 37. 89. 4.44 0.20 6.0 3057500200050 4. 3057500200051 38. 92. 6.49 0.09 4.0 3057500200052 5. 3057500200053 38. 93. 6.37 0.04 4.0 3057500200054 6. 3057500200055 43. 104. 1.64 0.22 14. 3057500200056 7. 3057500200057 52. 134. 6.80 0.24 5.5 3057500200058 8. 3057500200059 53. 134. 0. 7.26 0.24 5.0 3057500200060 9. 3057500200061 53. 135. 6.86 0.36 6.5 3057500200062 10. 3057500200063 55. 138. 0. 6.55 0.24 5.4 3057500200064 11. 3057500200065 56. 139. 6.34 0.20 5.0 3057500200066 12. 3057500200067 56. 141. 5.96 0.28 6.1 3057500200068 13. 3057500200069 57. 142. 5.22 0.09 4.5 3057500200070 14. 3057500200071 ENDDATA 32 0 3057500200072 ENDSUBENT 71 0 3057500299999 SUBENT 30575003 19871214 00003057500300001 BIB 4 33 3057500300002 REACTION (94-PU-239(N,F)ELEM/MASS,CUM,FY,,SPA) 3057500300003 DECAY-DATA ((1.)36-KR-85-M,4.48HR,DG,151.18,0.746) See correction 3057500300004 ((2.)36-KR-88,2.80HR,DG,196.31,0.263) Discrepancy:17% 3057500300005 ((3.)37-RB-89,15.15MIN,DG,1031.88,0.6358) 3057500300006 ((4.)38-SR-92,2.71HR,DG,1383.94,0.90) 3057500300007 ((5.)38-SR-93,7.3MIN,DG,590.2,0.677) See correction 3057500300008 ((6.)43-TC-104,18.2MIN,DG,357.99,0.9033) Discrepancy:8%3057500300009 ((7.)44-RU-105,4.4HR,DG,724.21,0.4728) Discrepancy:4% 3057500300010 see also correction 3057500300011 ((8.)52-TE-134,41.8MIN,DG,767.2,0.3063)Discrepancy:13% 3057500300012 ((9.)53-I-135,6.7HR,DG,1260.5,0.3028) 3057500300013 ((10.)56-BA-139,1.39HR,DG,165.8,0.188) Discrepancy:20% 3057500300014 see also correction 3057500300015 ((11.)56-BA-141,18.0MIN,DG,190.22,0.4401)See correction3057500300016 discrepancy:11% 3057500300017 ((12.)57-LA-142,92.7MIN,DG,641.7,0.4901) 3057500300018 discrepancy: see comment in subentry 1. 3057500300019 The data were taken from the compilation of J.Blachot 3057500300020 and C.Fiche,Atomic and nuclear data tables 20(1977)241.3057500300021 CORRECTION For interfering gamma-rays from other fission products:3057500300022 Nuclide Interfering gamma-ray(s) 3057500300023 85mKr 149.8 kev from 131Te 3057500300024 93Sr 590.8 kev from 101Mo 3057500300025 105Ru 724.2 kev from 95Zr 3057500300026 139Ba 164.6 and 169.0 kev from 133mTe 3057500300027 141Ba 191.9 kev from 101Mo 3057500300028 peaks were generally resolved by making use of 3057500300029 differences in half-lives following the decay.Only 3057500300030 in the case of 141Ba and interfering 101Mo with a 3057500300031 comparable half-life,a one step radiochemical 3057500300032 purification of barium had to be performed before 3057500300033 gamma counting.this included 139Ba. 3057500300034 STATUS (TABLE) Data taken from table 2 of first reference 3057500300035 ENDBIB 33 0 3057500300036 NOCOMMON 0 0 3057500300037 DATA 7 12 3057500300038 ELEMENT MASS ISOMER DATA ERR-S ERR-T 3057500300039 DECAY-FLAG 3057500300040 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS PER-CENT 3057500300041 NO-DIM 3057500300042 36. 85. 1. 0.57 0.01 4.3 3057500300043 1. 3057500300044 36. 88. 0.90 0.10 11.8 3057500300045 2. 3057500300046 37. 89. 1.46 0.07 6.2 3057500300047 3. 3057500300048 38. 92. 2.87 0.19 7.7 3057500300049 4. 3057500300050 38. 93. 3.63 0.20 6.9 3057500300051 5. 3057500300052 43. 104. 5.69 0.17 4.9 3057500300053 6. 3057500300054 44. 105. 5.42 0.27 6.3 3057500300055 7. 3057500300056 52. 134. 4.73 0.16 5.2 3057500300057 8. 3057500300058 53. 135. 6.63 0.40 7.2 3057500300059 9. 3057500300060 56. 139. 5.75 0.16 4.8 3057500300061 10. 3057500300062 56. 141. 5.52 0.01 4.0 3057500300063 11. 3057500300064 57. 142. 4.37 0.14 5.0 3057500300065 12. 3057500300066 ENDDATA 28 0 3057500300067 ENDSUBENT 66 0 3057500399999 ENDENTRY 3 0 3057599999999