ENTRY 23378 20180812 22692337800000001 SUBENT 23378001 20180812 22692337800100001 BIB 16 43 2337800100002 INSTITUTE (2GERKLN) 2337800100003 REFERENCE (J,RRL,18,259,1974) Issue 5 2337800100004 AUTHOR (H.F.Aly,U.Herpers) 2337800100005 TITLE The thermal neutron capture cross section and 2337800100006 resonance integral of actinium-227 2337800100007 DECAY-DATA (89-AC-228,6.13HR) 6.14+-0.02 hr measured. 2337800100008 (90-TH-227,,DG,236.,0.1035) 236 keV photopeak of Ac-2272337800100009 daughter was used to determine the Ac-227 amount. 2337800100010 REL-REF (R,,G.Erdtmann+,R,JUEL-1003-Ac,1973) 2337800100011 Branching ratios. 2337800100012 SAMPLE 8.E-9 g of Ac-227. 2337800100013 Gold 5.11E-7 g as monitor. 2337800100014 FACILITY (REAC,2GERJUL) FRJ-I reactor in Juelich 2337800100015 INC-SOURCE (REAC) Irradiation at the core of FRJ-I reactor. 2337800100016 Neutron flux ~6.E+13 n/cm2/sec . 2337800100017 METHOD (ACTIV) Subsequent irradiations of sample and monitor 2337800100018 with and without Cd at the same position. Cd thickness 2337800100019 0.99 mm - cutoff energy ~ 0.5 eV . 2337800100020 DETECTOR (GELI) Ge(Li)-detector coupled with TRIDAC 4096 channel2337800100021 analyzer. Resolution 2.9 keV for 1332 keV gamma-line of2337800100022 Co-60 . Accuracy 2 % for the relative efficiency and 2337800100023 5 % for absolute measurements. 2337800100024 ANALYSIS Westcott convention formula was used: 2337800100025 =SIG0*(g+r*sqrt(T/T0)*S0), where 2337800100026 - effective cross section, 2337800100027 SIG0 - thermal cross section, 2337800100028 g - factor related to deviation of SIG0 from 1/v law 2337800100029 in thermal region, 2337800100030 r*sqrt(T/T0) - epithermal index, 2337800100031 S0 - representative of deviation of SIG0 from 1/v law i2337800100032 epithermal energy . 2337800100033 For Ac-227 g=1. was assumed. 2337800100034 MONITOR ((MONIT1)79-AU-197(N,G)79-AU-198,,SIG) 2337800100035 Thermal cross section = 98.8 b , 2337800100036 g-factor 1.005, S0 17.0 for Au ; 2337800100037 epithermal index was calculated as: 2337800100038 g/(Cd*(S0+1/k)-S0), where k=2.393, Cd- cadmium ratio 2337800100039 for Au. 2337800100040 DECAY-MON (79-AU-198,,DG,412.,0.9553) 2337800100041 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 2337800100042 article. 2337800100043 Uncertainty of number of Ac-227 atoms < 1. % . 2337800100044 HISTORY (20180812C) 2337800100045 ENDBIB 43 0 2337800100046 COMMON 1 3 2337800100047 MONIT1 2337800100048 B 2337800100049 98.8 2337800100050 ENDCOMMON 3 0 2337800100051 ENDSUBENT 50 0 2337800199999 SUBENT 23378002 20180812 22692337800200001 BIB 3 16 2337800200002 REACTION (89-AC-227(N,G)89-AC-228,,SIG) 2337800200003 REL-REF (D,,R.K.Sjoblom+,R,ANL-5263,1954) 2337800200004 529+-50 b (activation) 2337800200005 (D,,H.W.Kirby+,J,PR,102,1140,1956) 2337800200006 446+-45 b (activation), 513+-36 b (absorption) 2337800200007 (D,,M.J.Cabell,J,CJC,37,1094,1959) 2337800200008 814+-13 b (activation, published), 2337800200009 892+-14 b (activation, recalculated by newer data: 2337800200010 3.63E-6 1/hr instead of 3.66E-6 1/hr for Ac-227 , 2337800200011 1.542E-3 1/hr instead of 1.59E-3 1/hr for Th-227, 2337800200012 cobalt monitor - SIG 38.0 b instead of 36.5 b, 2337800200013 S0 1.60 instead of 0.9753, 2337800200014 I0 69.9 instead of 48.6 b. 2337800200015 STATUS (TABLE) Tables 1,2 of J.Radiochem.Radioanal.Lett., 2337800200016 v.18,is.5,p.259,1974 2337800200017 (DEP,23378005) Directly measured data 2337800200018 ENDBIB 16 0 2337800200019 NOCOMMON 0 0 2337800200020 DATA 3 1 2337800200021 EN DATA DATA-ERR 2337800200022 EV B B 2337800200023 0.0253 1020. 39. 2337800200024 ENDDATA 3 0 2337800200025 ENDSUBENT 24 0 2337800299999 SUBENT 23378003 20180812 22692337800300001 BIB 3 12 2337800300002 REACTION (89-AC-227(N,G)89-AC-228,,RI) 2337800300003 REL-REF (D,,M.J.Cabell,J,CJC,37,1094,1959) 2337800300004 1177+-9 b (activation, published), 2337800300005 1657+-16 b (activation, recalculated by newer data: 2337800300006 3.63E-6 1/hr instead of 3.66E-6 1/hr for Ac-227 , 2337800300007 1.542E-3 1/hr instead of 1.59E-3 1/hr for Th-227, 2337800300008 cobalt monitor - SIG 38.0 b instead of 36.5 b, 2337800300009 S0 1.60 instead of 0.9753, 2337800300010 I0 69.9 instead of 48.6 b. 2337800300011 STATUS (TABLE) Tables 1,2 of J.Radiochem.Radioanal.Lett., 2337800300012 v.18,is.5,p.259,1974 2337800300013 (DEP,23378006) Directly measured data 2337800300014 ENDBIB 12 0 2337800300015 NOCOMMON 0 0 2337800300016 DATA 3 1 2337800300017 EN-MIN DATA DATA-ERR 2337800300018 EV B B 2337800300019 0.5 2279. 105. 2337800300020 ENDDATA 3 0 2337800300021 ENDSUBENT 20 0 2337800399999 SUBENT 23378004 20180812 22692337800400001 BIB 3 13 2337800400002 REACTION (89-AC-227(N,G)89-AC-228,,RI,,RNV) 2337800400003 Without 1/v contribution 2337800400004 REL-REF (D,,M.J.Cabell,J,CJC,37,1094,1959) 2337800400005 821+-16 b (activation, published), 2337800400006 1410+-28 b (activation, recalculated by newer data: 2337800400007 3.63E-6 1/hr instead of 3.66E-6 1/hr for Ac-227 , 2337800400008 1.542E-3 1/hr instead of 1.59E-3 1/hr for Th-227, 2337800400009 cobalt monitor - SIG 38.0 b instead of 36.5 b, 2337800400010 S0 1.60 instead of 0.9753, 2337800400011 I0 69.9 instead of 48.6 b. 2337800400012 STATUS (TABLE) Tables 1,2 of J.Radiochem.Radioanal.Lett., 2337800400013 v.18,is.5,p.259,1974 2337800400014 (DEP,23378007) Directly measured data 2337800400015 ENDBIB 13 0 2337800400016 NOCOMMON 0 0 2337800400017 DATA 3 1 2337800400018 EN-MIN DATA DATA-ERR 2337800400019 EV B B 2337800400020 0.5 1889. 197. 2337800400021 ENDDATA 3 0 2337800400022 ENDSUBENT 21 0 2337800499999 SUBENT 23378005 20180812 22692337800500001 BIB 4 10 2337800500002 REACTION (89-AC-227(N,G)89-AC-228,,SIG) 2337800500003 DECAY-DATA ((1.)89-AC-228,,DG,911.2,0.2200) 2337800500004 Three measurements : 1014, 1030, 1034 b 2337800500005 ((2.)89-AC-228,,DG,964.4/968.8,0.1700) 2337800500006 Three measurements : 1093, 1019, 1055 b 2337800500007 ((3.)89-AC-228,,DG,1588.3,0.02600) 2337800500008 Three measurements : 923, 1001, 1007 b 2337800500009 ANALYSIS Mean of three measurements for each Ac-228 photopeak 2337800500010 STATUS (TABLE) Table 1 of J.Radiochem.Radioanal.Lett., 2337800500011 v.18,is.5,p.259,1974 2337800500012 ENDBIB 10 0 2337800500013 COMMON 1 3 2337800500014 EN 2337800500015 EV 2337800500016 0.0253 2337800500017 ENDCOMMON 3 0 2337800500018 DATA 3 3 2337800500019 DATA DATA-ERR DECAY-FLAG 2337800500020 B B NO-DIM 2337800500021 1026. 10. 1. 2337800500022 1056. 36. 2. 2337800500023 977. 42. 3. 2337800500024 ENDDATA 5 0 2337800500025 ENDSUBENT 24 0 2337800599999 SUBENT 23378006 20180812 22692337800600001 BIB 5 11 2337800600002 REACTION (89-AC-227(N,G)89-AC-228,,RI) 2337800600003 MONITOR ((MONIT2)79-AU-197(N,G)79-AU-198,,RI) 1558. b 2337800600004 DECAY-DATA ((1.)89-AC-228,,DG,911.2,0.2200) 2337800600005 Three measurements : 2346, 2380, 2323 b 2337800600006 ((2.)89-AC-228,,DG,964.4/968.8,0.1700) 2337800600007 Three measurements : 2540, 2242, 2264 b 2337800600008 ((3.)89-AC-228,,DG,1588.3,0.02600) 2337800600009 Three measurements : 2149, 2126, 2140 b 2337800600010 ANALYSIS Mean of three measurements for each Ac-228 photopeak 2337800600011 STATUS (TABLE) Table 1 of J.Radiochem.Radioanal.Lett., 2337800600012 v.18,is.5,p.259,1974 2337800600013 ENDBIB 11 0 2337800600014 COMMON 2 3 2337800600015 EN-MIN MONIT2 2337800600016 EV B 2337800600017 0.5 1558. 2337800600018 ENDCOMMON 3 0 2337800600019 DATA 3 3 2337800600020 DATA DATA-ERR DECAY-FLAG 2337800600021 B B NO-DIM 2337800600022 2349. 29. 1. 2337800600023 2349. 149. 2. 2337800600024 2138. 12. 3. 2337800600025 ENDDATA 5 0 2337800600026 ENDSUBENT 25 0 2337800699999 SUBENT 23378007 20180812 22692337800700001 BIB 4 14 2337800700002 REACTION (89-AC-227(N,G)89-AC-228,,RI,,RNV) 2337800700003 Without 1/v contribution 2337800700004 DECAY-DATA ((1.)89-AC-228,,DG,911.2,0.2200) 2337800700005 Three measurements : 2007, 1967, 1906 b 2337800700006 ((2.)89-AC-228,,DG,964.4/968.8,0.1700) 2337800700007 Three measurements : 2176, 1835, 1819 b 2337800700008 ((3.)89-AC-228,,DG,1588.3,0.02600) 2337800700009 Three measurements : 1837, 1720, 1731 b 2337800700010 ANALYSIS Mean of three measurements for each Ac-228 photopeak 2337800700011 Reduced resonance integral I0' was calculated using 2337800700012 relation : 2337800700013 S0=2/sqrt(PI)*IO'/SIG0 2337800700014 STATUS (TABLE) Table 1 of J.Radiochem.Radioanal.Lett., 2337800700015 v.18,is.5,p.259,1974 2337800700016 ENDBIB 14 0 2337800700017 COMMON 1 3 2337800700018 EN-MIN 2337800700019 EV 2337800700020 0.5 2337800700021 ENDCOMMON 3 0 2337800700022 DATA 3 3 2337800700023 DATA DATA-ERR DECAY-FLAG 2337800700024 B B NO-DIM 2337800700025 1960. 46. 1. 2337800700026 1943. 179. 2. 2337800700027 1763. 59. 3. 2337800700028 ENDDATA 5 0 2337800700029 ENDSUBENT 28 0 2337800799999 ENDENTRY 7 0 2337899999999