ENTRY 30967 20090915 31413096700000001 SUBENT 30967001 20090915 31413096700100001 BIB 17 65 3096700100002 INSTITUTE (3PAKNIL) 3096700100003 (2GERJUL) Last two authors 3096700100004 AUTHOR (J.H.Zaidi,H.M.A.Karim,M.Arif,I.H.Qureshi,S.M.Qaim, 3096700100005 G.Stoecklin) 3096700100006 TITLE Fission neutron spectrum averaged cross sections of 3096700100007 some threshold reactions on molybdenum: estimation of 3096700100008 radioactive impurities in (n,gamma)-produced Mo-99 - 3096700100009 Tc-99-m generator system 3096700100010 REFERENCE (J,RCA,49,107,1990) 3096700100011 (C,91JUELIC,,598,199105) Subents 013-015 3096700100012 FACILITY (REAC,3PAKNIL) 5 MW swimming pool type 3096700100013 INC-SOURCE (REAC) neutron flux of 6.7 x 10**12 n/cm2/s 3096700100014 INC-SPECT From the fact that the K-factor (ratio fast- and therm.3096700100015 flux density), using monitor reactions with different 3096700100016 thresholds, was almost constant (within 10%), it was 3096700100017 concluded that the neutron spectrum used was a fission 3096700100018 spectrum. 3096700100019 SAMPLE Mo-oxide (purity 99.999%) or enriched Mo-92-oxide, 3096700100020 and enriched Ni-58 powder filled in quartz ampoules 3096700100021 and then placed in an NRX type irradiation capsule 3096700100022 METHOD (ACTIV,CHSEP) Radiochemical separation of niobium and 3096700100023 zirconium from the matrix activity, which contained 3096700100024 large quantities of Mo-99 and Tc-99-m, and of cobalt 3096700100025 and nickel from the irradiated Ni-58. 3096700100026 DETECTOR (GELI) For measuring the X-rays emitted in the decay 3096700100027 of Nb-91-m a Si(Li) detector was used. 3096700100028 PART-DET (DG,AR,XR) 3096700100029 ANALYSIS (DECAY) Each cross section value is a mean of the 3096700100030 results of at least six independent measurements 3096700100031 MONITOR ((MONIT1)26-FE-54(N,P)25-MN-54,,SIG,,FIS) 3096700100032 ((MONIT2)26-FE-56(N,P)25-MN-56,,SIG,,FIS) 3096700100033 ((MONIT3)28-NI-58(N,P)27-CO-58,,SIG,,FIS) 3096700100034 ((MONIT4)28-NI-60(N,P)27-CO-60,,SIG,,FIS) 3096700100035 From these four monitor threshold reactions the fast 3096700100036 neutron flux densities, effective at the ampoules, 3096700100037 were determined. 3096700100038 ASSUMED (ASSUM1,79-AU-197(N,G)79-AU-198,,SIG,,EPI) 3096700100039 (ASSUM2,27-CO-59(N,G)27-CO-60,,SIG,,EPI) 3096700100040 The thermal flux, effective at the ampoules, was 3096700100041 determined from these two reactions 3096700100042 CORRECTION The count rates were converted to decay rates by 3096700100043 applying corrections for radiochemical yields, 3096700100044 gamma-ray intensities, detector efficiencies, counting 3096700100045 geometry, absorption, self-absorption, pile-up effects,3096700100046 coincidence losses, and contributions from decay of 3096700100047 parents 3096700100048 ERR-ANALYS (ERR-T) Reported errors incorporate both statistical 3096700100049 and systematical errors 3096700100050 Main errors were those associated with determination 3096700100051 of: 3096700100052 (ERR-1) Fast neutron flux densities (8%) and 3096700100053 (ERR-2,5.,10.) absolute decay rates (5 to 10%) 3096700100054 Other sources of errors were < 1% 3096700100055 HISTORY (19911203C) HW 3096700100056 (19930428A) HW.- Subents 013- 015 added, keywords 3096700100057 'REFERENCE' and 'STATUS' moved to subents 002 - 014, 3096700100058 some cosmetics in Bib sections of subent 001, 011.- 3096700100059 (19940411A) HW.- Corrections Bib sections san 014, 015.3096700100060 (19940609A) HW.- Subents 014, 015 deleted, superseded 3096700100061 by subents 31438002, -003 respectively. 3096700100062 (19960502U) HW.- Small corrections in sub. 013 3096700100063 (20090912A) SD:Updated to new date formats,lower case. 3096700100064 Reference removed from Subents and added to Subent 001 3096700100065 Description of facility was added and codes for err- 3096700100066 analysis 3096700100067 ENDBIB 65 0 3096700100068 COMMON 14 9 3096700100069 EN-MEAN ASSUM1 ASSUM1-ERR ASSUM2 ASSUM2-ERR MONIT1 3096700100070 MONIT1-ERR MONIT2 MONIT2-ERR MONIT3 MONIT3-ERR MONIT4 3096700100071 MONIT4-ERR ERR-1 3096700100072 MEV MB MB MB MB MB 3096700100073 MB MB MB MB MB MB 3096700100074 MB PER-CENT 3096700100075 1.5 98.8 0.3 37.2 0.2 82.5 3096700100076 5.0 1.07 .08 113. 7.0 2.3 3096700100077 0.4 8. 3096700100078 ENDCOMMON 9 0 3096700100079 ENDSUBENT 78 0 3096700199999 SUBENT 30967002 20090915 31413096700200001 BIB 4 4 3096700200002 REACTION (42-MO-92(N,P)41-NB-92-M,,SIG,,FIS) 3096700200003 DECAY-DATA (41-NB-92-M,10.14D,DG,934.,.992) 3096700200004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700200005 HISTORY (19930428U) HW.-Reference and status added.- 3096700200006 ENDBIB 4 0 3096700200007 NOCOMMON 0 0 3096700200008 DATA 2 1 3096700200009 DATA ERR-T 3096700200010 MB MB 3096700200011 6.81 0.5 3096700200012 ENDDATA 3 0 3096700200013 ENDSUBENT 12 0 3096700299999 SUBENT 30967003 20090915 31413096700300001 BIB 4 4 3096700300002 REACTION (42-MO-95(N,P)41-NB-95-M,,SIG,,FIS) 3096700300003 DECAY-DATA (41-NB-95-M,86.6HR,DG,235.,.25) 3096700300004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700300005 HISTORY (19930428U) HW.-Reference and status added.- 3096700300006 ENDBIB 4 0 3096700300007 NOCOMMON 0 0 3096700300008 DATA 2 1 3096700300009 DATA ERR-T 3096700300010 MB MB 3096700300011 0.06 0.006 3096700300012 ENDDATA 3 0 3096700300013 ENDSUBENT 12 0 3096700399999 SUBENT 30967004 20090915 31413096700400001 BIB 5 7 3096700400002 REACTION (42-MO-95(N,P)41-NB-95-G,,SIG,,FIS) 3096700400003 DECAY-DATA (41-NB-95-G,34.97D,DG,766.,.999) 3096700400004 COMMENT The contributions of the Mo-95(n,p)Nb-95-m -> Nb-95 3096700400005 and Mo-98(n,a)Zr-95 -> Nb-95 processes were taken 3096700400006 into account in determination of cross sections 3096700400007 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700400008 HISTORY (19930428U) Hw.-Reference and status added.- 3096700400009 ENDBIB 7 0 3096700400010 NOCOMMON 0 0 3096700400011 DATA 2 1 3096700400012 DATA ERR-T 3096700400013 MB MB 3096700400014 0.08 0.008 3096700400015 ENDDATA 3 0 3096700400016 ENDSUBENT 15 0 3096700499999 SUBENT 30967005 20090915 31413096700500001 BIB 4 4 3096700500002 REACTION (42-MO-96(N,P)41-NB-96,,SIG,,FIS) 3096700500003 DECAY-DATA (41-NB-96,23.3HR,DG,569.,.556) 3096700500004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700500005 HISTORY (19930428U) HW.-Reference and status added.- 3096700500006 ENDBIB 4 0 3096700500007 NOCOMMON 0 0 3096700500008 DATA 2 1 3096700500009 DATA ERR-T 3096700500010 MB MB 3096700500011 0.22 0.03 3096700500012 ENDDATA 3 0 3096700500013 ENDSUBENT 12 0 3096700599999 SUBENT 30967006 20090915 31413096700600001 BIB 4 4 3096700600002 REACTION (42-MO-97(N,P)41-NB-97,,SIG,,FIS) 3096700600003 DECAY-DATA (41-NB-97-G,72.1MIN,DG,658.,.982) 3096700600004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700600005 HISTORY (19930428U) HW.-Reference and status added.- 3096700600006 ENDBIB 4 0 3096700600007 NOCOMMON 0 0 3096700600008 DATA 2 1 3096700600009 DATA ERR-T 3096700600010 MB MB 3096700600011 0.11 0.01 3096700600012 ENDDATA 3 0 3096700600013 ENDSUBENT 12 0 3096700699999 SUBENT 30967007 20090915 31413096700700001 BIB 4 4 3096700700002 REACTION (42-MO-92(N,A)40-ZR-89,,SIG,,FIS) 3096700700003 DECAY-DATA (40-ZR-89-G,78.4HR,DG,909.,.990) 3096700700004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096700700005 HISTORY (19930428U) HW.-Reference and status added.- 3096700700006 ENDBIB 4 0 3096700700007 NOCOMMON 0 0 3096700700008 DATA 2 1 3096700700009 DATA ERR-T 3096700700010 MB MB 3096700700011 0.021 0.003 3096700700012 ENDDATA 3 0 3096700700013 ENDSUBENT 12 0 3096700799999 SUBENT 30967008 20090915 31413096700800001 BIB 5 6 3096700800002 REACTION (42-MO-98(N,A)40-ZR-95,,SIG,,FIS) 3096700800003 DECAY-DATA (40-ZR-95,64.0D,DG,724.,.437) 3096700800004 REFERENCE (C,91JUELIC,,598,199105) 3096700800005 STATUS (TABLE) Data are taken from RCA,49,107,90 Table 3 3096700800006 HISTORY (19930428U) Hw.-References and status added.- 3096700800007 (20090912A) SD:Updated to new date formats,lower case. 3096700800008 ENDBIB 6 0 3096700800009 NOCOMMON 0 0 3096700800010 DATA 2 1 3096700800011 DATA ERR-T 3096700800012 MB MB 3096700800013 0.014 0.002 3096700800014 ENDDATA 3 0 3096700800015 ENDSUBENT 14 0 3096700899999 SUBENT 30967009 20090915 31413096700900001 BIB 4 5 3096700900002 REACTION (42-MO-100(N,A)40-ZR-97,,SIG,,FIS) 3096700900003 DECAY-DATA (40-ZR-97,16.9HR,DG,743.,.928) 3096700900004 STATUS (TABLE) Data are taken from RCA,49,107,90 Table 3 3096700900005 HISTORY (19930428U) Hw.-Reference and status added.- 3096700900006 (20090912A) SD:Updated to new date formats,lower case. 3096700900007 ENDBIB 5 0 3096700900008 NOCOMMON 0 0 3096700900009 DATA 2 1 3096700900010 DATA ERR-T 3096700900011 MB MB 3096700900012 0.011 0.002 3096700900013 ENDDATA 3 0 3096700900014 ENDSUBENT 13 0 3096700999999 SUBENT 30967010 20090915 31413096701000001 BIB 5 8 3096701000002 REACTION (42-MO-92(N,2N)42-MO-91,,SIG,,FIS) 3096701000003 DECAY-DATA (42-MO-91-G,15.5MIN,AR,511.,1.882) 3096701000004 COMMENT Because of its very high q-value the contribution 3096701000005 of the Mo-92(n,2n)Mo-91-m -> Mo-91-g process is 3096701000006 assumed to Be negligible 3096701000007 STATUS (TABLE) Data are taken from RCA,49,107,90 Table 3 3096701000008 HISTORY (19930428U) Hw.-Reference and status added.- 3096701000009 (20090912A) SD:Updated to new date formats,lower case. 3096701000010 ENDBIB 8 0 3096701000011 NOCOMMON 0 0 3096701000012 DATA 2 1 3096701000013 DATA ERR-T 3096701000014 MB MB 3096701000015 0.141 0.015 3096701000016 ENDDATA 3 0 3096701000017 ENDSUBENT 16 0 3096701099999 SUBENT 30967011 20090915 31413096701100001 BIB 4 8 3096701100002 REACTION (42-MO-92(N,X)41-NB-91-M,,SIG,,FIS) 3096701100003 DECAY-DATA (41-NB-91-M,62.D,XR,16.6,.409) 3096701100004 Cross section value is a sum of (n,n'+p),(n,p+n) 3096701100005 and (n,d) cross sections. Cumulative production 3096701100006 through Mo-92(n,2n) was assumed to be negligible 3096701100007 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096701100008 HISTORY (19930428U) HW.-Reference and status added, reaction 3096701100009 code altered.- 3096701100010 ENDBIB 8 0 3096701100011 NOCOMMON 0 0 3096701100012 DATA 1 1 3096701100013 DATA-MAX 3096701100014 MB 3096701100015 0.022 3096701100016 ENDDATA 3 0 3096701100017 ENDSUBENT 16 0 3096701199999 SUBENT 30967012 20090915 31413096701200001 BIB 4 5 3096701200002 REACTION (42-MO-98(N,P)41-NB-98-M,,SIG,,FIS) 3096701200003 DECAY-DATA (41-NB-98-M,51.3MIN,DG,787.,.932) 3096701200004 STATUS (TABLE) Data are taken from J,RCA,49,107,90 Table 3 3096701200005 HISTORY (19930428U) HW.-Reference and status added.- 3096701200006 (20090912A) SD:Updated to new date formats,lower case. 3096701200007 ENDBIB 5 0 3096701200008 NOCOMMON 0 0 3096701200009 DATA 2 1 3096701200010 DATA ERR-T 3096701200011 MB MB 3096701200012 0.022 0.003 3096701200013 ENDDATA 3 0 3096701200014 ENDSUBENT 13 0 3096701299999 SUBENT 30967013 20090915 31413096701300001 BIB 3 8 3096701300002 REACTION (42-MO-95(N,P)41-NB-95,,SIG,,FIS) 3096701300003 STATUS (DEP,30967003) 3096701300004 (DEP,30967004) 3096701300005 (TABLE) Data, taken from Conf. on Nucl. Data for Sci. 3096701300006 and Technol., Juelich 1991, page 598, Table 1, is 3096701300007 arithmetical sum of the data in subent 003 and 004. 3096701300008 HISTORY (19930428A) HW.-Subentry added ( previously 30986002).-3096701300009 (19960502U) HW.-Small corrections in text under status.3096701300010 ENDBIB 8 0 3096701300011 NOCOMMON 0 0 3096701300012 DATA 2 1 3096701300013 DATA ERR-T 3096701300014 MICRO-B MICRO-B 3096701300015 140. 10. 3096701300016 ENDDATA 3 0 3096701300017 ENDSUBENT 16 0 3096701399999 SUBENT 30967014 20090915 31413096701400001 BIB 3 8 3096701400002 REACTION (28-NI-58(N,2N)28-NI-57,,SIG,,FIS) 3096701400003 STATUS (TABLE) Data taken from Conf. on Nucl. Data for Sci. 3096701400004 and Technol., Juelich 1991, page 355, Table 1 and 2. 3096701400005 (SPSDD,31437002) 3096701400006 HISTORY (19930428A) HW.-Subentry added ( previously 30986004).-3096701400007 (19940411A) HW.- Correction in history.- 3096701400008 (19940609D) HW.-Subentry deleted, superseded by 3096701400009 subent. 31438002.- 3096701400010 ENDBIB 8 0 3096701400011 NOCOMMON 0 0 3096701400012 NODATA 0 0 3096701400013 ENDSUBENT 12 0 3096701499999 SUBENT 30967015 20090915 31413096701500001 BIB 3 8 3096701500002 REACTION (28-NI-58(N,X)27-CO-57,,SIG,,FIS) 3096701500003 STATUS (TABLE) Data taken from Conf. on Nucl. Data for Sci. 3096701500004 and Technol., Juelich 1991, page 355, Table 1 and 2. 3096701500005 (SPSDD,31437003) 3096701500006 HISTORY (19930428A) HW.-Subentry added ( previously 30986005).-3096701500007 (19940411A) HW.- Correction in history.- 3096701500008 (19940609D) HW.-Subentry deleted, superseded by 3096701500009 subent. 31438003.- 3096701500010 ENDBIB 8 0 3096701500011 NOCOMMON 0 0 3096701500012 NODATA 0 0 3096701500013 ENDSUBENT 12 0 3096701599999 ENDENTRY 15 0 3096799999999