ENTRY 21625 20151213 22462162500000001 SUBENT 21625001 20151213 22462162500100001 BIB 17 83 2162500100002 INSTITUTE (2UK NPL) 2162500100003 REFERENCE (J,NSE,72,(3),357,197912) 2162500100004 AUTHOR (T.B.Ryves) 2162500100005 TITLE The thermal-neutron capture cross section for 2162500100006 the production of Ag-108-m. 2162500100007 REL-REF (M,,T.B.Ryves+,J,JNE,22,759,1968) Details of analysis. 2162500100008 (I,,P.J.Campton,J,ARI,4,232,1959) Details of 2162500100009 coincidence technique. 2162500100010 (I,,P.F.Zweifel,J,NUC,18,(11),174,1960) Details of 2162500100011 thermal self-shielding. 2162500100012 (I,,G.M.Roe,R,KAPL-1241,1954) Details of resonance 2162500100013 self-shielding. 2162500100014 FACILITY (REAC,2UK LON) Reactor CONSORT 2. 2162500100015 INC-SOURCE (REAC) Reactor neutrons. 2162500100016 INC-SPECT Neutron flux density about 1.x 10.**12 n/cm2/sec, 2162500100017 monitored by cobalt. 2162500100018 Epithermal neutron flux was measured to be very nearly2162500100019 1/E per unit energy interval. 2162500100020 SAMPLE Sandwiches consist of Ag-107 enriched (99.6%) foils 2162500100021 and small Al-Co alloy foils (monitor),encased in the 2162500100022 Cd-boxes of 1 mm thick. The Co-Al alloy contains 2162500100023 99.240% Al and 0.760% Co. 2162500100024 METHOD (ACTIV) Irradiation of sample and monitor foils 2162500100025 both bare and encased in cadmium boxes. 2162500100026 Cooling time - 13 years (to remove most of 252.6-day 2162500100027 Ag-110m). 2162500100028 Counting over period of 5 years. 2162500100029 DETECTOR (GELI) Ge(Li)-detector for counting of the 2162500100030 sample foils, calibrated with standardized sources. 2162500100031 (COIN,PROPC,PROPC) A 4*Pi beta-gamma coincidence 2162500100032 arrangement. The 4*Pi beta counter is a 90% argon and 2162500100033 10% methane gas flow proportional counter. 2162500100034 PART-DET (B) Beta particles and 2162500100035 (DG) decay gammas. 2162500100036 STATUS Text, main reference. 2162500100037 ANALYSIS (AREA) Areas under gamma-ray photopeaks were estimated.2162500100038 Cadmium ratio: Co-59 - 17.3 +- 0.2, 2162500100039 Ag-107 - 17.7 +- 2.7, 2162500100040 Ag-109 - 3.00 +- 0.03. 2162500100041 CORRECTION -For self-shielding. 2162500100042 -For sensitivity of the 4*pi beta detector to 2162500100043 Co-60 gamma rays - 1.0076 correction factor. 2162500100044 ERR-ANALYS (ERR-T) Total error given. Detailed uncertainties 2162500100045 analysis given in Table 2 of reference (in %): 2162500100046 Source of uncertainty Co-60 Ag-108m Ag-110m 2162500100047 ------------------------------------------------- 2162500100048 Half-life 0.2 16.5 1. 2162500100049 2200 m/sec-SIGMA 0.5 2162500100050 Thermal self-shielding 1. 1. 1. 2162500100051 Resonance self-shield. 4. 2162500100052 Resonance integral 4. 2162500100053 Foil composition 0.5 2162500100054 Flux level 1. 1. 1. 2162500100055 Reactor spectrum 5. 5. 5. 2162500100056 Decay scheme 1. 2162500100057 Counter efficiency 0.2 3. 2162500100058 Statistics (no Cd) 0.3 4. 1. 2162500100059 Statistics (with Cd) 1.2 15. 1. 2162500100060 -------------------------------------------------- 2162500100061 (Statistical errors are 3*sigma). 2162500100062 (ERR-1) Uncertainty due to thermal shelf shielding. 2162500100063 (ERR-2) Uncertainty due to flux level. 2162500100064 (ERR-3) Uncertainty due to reactor spectrum. 2162500100065 (ERR-4) Uncertainty of Co-60 half-life. 2162500100066 (ERR-5) Uncertainty of resonance integral for Co. 2162500100067 (ERR-6) Uncertainty due to Co foil composition. 2162500100068 (ERR-7) Uncertainty of counter efficiency for Co. 2162500100069 (ERR-8) Random statistical uncertainty of 2162500100070 Co-60 activity measurement without Cd 2162500100071 (at confidence level 99%). 2162500100072 (ERR-9) Random statistical uncertainty of 2162500100073 Co-60 activity measurement with Cd 2162500100074 (at confidence level 99%). 2162500100075 HISTORY (19800808C) G.C. 2162500100076 (20080126A) M.M. Energy units in SUBENT .002 were 2162500100077 corrected : "MILLI-EV" -> "EV". Dates were corrected 2162500100078 for 4-digits year. Upper-lower case correction. 2162500100079 BIB information was added. DATA-ERR was changed into 2162500100080 total error ERR-T. ERR-1 - ERR-15 were introduced. 2162500100081 (20101102A) SD: opening parenthesis in ANALYSIS 2162500100082 removed from column 11 to 12. 2162500100083 (20151213A) SD: DECAY-MON corrected in Subent 004. 2162500100084 REACTION code modified in Subents 003, 004. 2162500100085 ENDBIB 83 0 2162500100086 COMMON 9 6 2162500100087 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2162500100088 ERR-7 ERR-8 ERR-9 2162500100089 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2162500100090 PER-CENT PER-CENT PER-CENT 2162500100091 1. 1. 5. 0.2 4. 0.5 2162500100092 0.2 0.3 1.2 2162500100093 ENDCOMMON 6 0 2162500100094 ENDSUBENT 93 0 2162500199999 SUBENT 21625002 20080126 21932162500200001 BIB 8 24 2162500200002 REACTION (47-AG-107(N,G)47-AG-108-M,,SIG) 2200 m/sec 2162500200003 Thermal-neutron capture cross section. 2162500200004 DECAY-DATA (47-AG-108-M,127.YR,DG,434.,0.908) 2162500200005 MONITOR ((MONIT)27-CO-59(N,G)27-CO-60,,SIG) 2200 m/sec 2162500200006 To monitor neutron flux density and measure epithermal2162500200007 spectrum. 2162500200008 DECAY-MON (27-CO-60-G,5.26YR,DG) 2162500200009 REL-REF (A,,D.V.Rao+,J,ARI,29,405,1978) 2162500200010 ERR-ANALYS (ERR-10) Uncertainty of Ag-108m half-life (21. year). 2162500200011 (ERR-11) Uncertainty due to resonance self-shielding 2162500200012 for Ag-108m. 2162500200013 (ERR-12) Uncertainty due to decay scheme for Ag-108m. 2162500200014 (ERR-13) Uncertainty of counter efficiency for Ag-108m.2162500200015 (ERR-14) Random statistical uncertainty of 2162500200016 Ag-108m activity measurement without Cd 2162500200017 (at confidence level 99%). 2162500200018 (ERR-15) Random statistical uncertainty of 2162500200019 Ag-108m activity measurement with Cd 2162500200020 (at confidence level 99%). 2162500200021 STATUS (TABLE) Table 1 of reference. 2162500200022 HISTORY (19800808C) G.C. 2162500200023 (19800829E) 2162500200024 (19860321A)N.CH 2162500200025 (19860416E) 2162500200026 ENDBIB 24 0 2162500200027 COMMON 6 3 2162500200028 ERR-10 ERR-11 ERR-12 ERR-13 ERR-14 ERR-15 2162500200029 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2162500200030 16.5 4. 1. 3. 4. 15. 2162500200031 ENDCOMMON 3 0 2162500200032 DATA 5 1 2162500200033 EN DATA ERR-T MONIT MONIT-ERR 2162500200034 EV B B B B 2162500200035 2.5300E-02 3.6600E-01 6.5000E-02 3.7200E+01 2.0000E-01 2162500200036 ENDDATA 3 0 2162500200037 ENDSUBENT 36 0 2162500299999 SUBENT 21625003 20151213 22462162500300001 BIB 8 23 2162500300002 REACTION ((47-AG-107(N,G)47-AG-108-M,,RI)// 2162500300003 (47-AG-107(N,G)47-AG-108-M,,SIG)) 2162500300004 Ratio of reduced resonance integral at infinite 2162500300005 dilution to thermal-neutron capture cross section. 2162500300006 INC-SPECT Thermal Maxwellian spectrum. 2162500300007 DECAY-DATA (47-AG-108-M,127.YR,DG,434.,0.908) 2162500300008 MONITOR ((MONIT)(27-CO-59(N,G)27-CO-60,,RI)// 2162500300009 (27-CO-59(N,G)27-CO-60,,SIG,,MXW)) 2162500300010 DECAY-MON (27-CO-60-G,5.26YR,DG) 2162500300011 ERR-ANALYS (ERR-10) Uncertainty of Ag-108m half-life (21. year). 2162500300012 (ERR-11) Uncertainty due to resonance self-shielding 2162500300013 for Ag-108m. 2162500300014 (ERR-12) Uncertainty due to decay scheme for Ag-108m. 2162500300015 (ERR-13) Uncertainty of counter efficiency for Ag-108m.2162500300016 (ERR-14) Random statistical uncertainty of 2162500300017 Ag-108m activity measurement without Cd 2162500300018 (at confidence level 99%). 2162500300019 (ERR-15)) Random statistical uncertainty of 2162500300020 Ag-108m activity measurement with Cd 2162500300021 (at confidence level 99%). 2162500300022 STATUS (TABLE) Table 1 of reference. 2162500300023 HISTORY (20151213A) SD: SF8=MXW deleted from REACTION code 2162500300024 denominator. EN-DUMMY -> EN-DUM-DN; EN-MIN-NM added. 2162500300025 ENDBIB 23 0 2162500300026 COMMON 6 3 2162500300027 ERR-10 ERR-11 ERR-12 ERR-13 ERR-14 ERR-15 2162500300028 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2162500300029 16.5 4. 1. 3. 4. 15. 2162500300030 ENDCOMMON 3 0 2162500300031 DATA 6 1 2162500300032 EN-DUM-DN EN-MIN-NM DATA ERR-T MONIT MONIT-ERR 2162500300033 EV EV NO-DIM NO-DIM NO-DIM NO-DIM 2162500300034 0.0253 0.5 3.0 0.5 1.58 0.06 2162500300035 ENDDATA 3 0 2162500300036 ENDSUBENT 35 0 2162500399999 SUBENT 21625004 20151213 22462162500400001 BIB 8 20 2162500400002 REACTION ((47-AG-109(N,G)47-AG-110-M,,RI)// 2162500400003 (47-AG-109(N,G)47-AG-110-M,,SIG)) 2162500400004 Ratio of reduced resonance integral at infinite 2162500400005 dilution to thermal-neutron capture cross section. 2162500400006 INC-SPECT Thermal Maxwellian spectrum. 2162500400007 DECAY-DATA (47-AG-110-M,252.D,DG,446.,,DG,657.) 2162500400008 MONITOR ((MONIT)(27-CO-59(N,G)27-CO-60,,RI)// 2162500400009 (27-CO-59(N,G)27-CO-60,,SIG,,MXW)) 2162500400010 DECAY-MON (27-CO-60-G,5.26YR,DG) 2162500400011 ERR-ANALYS (ERR-10) Uncertainty of Ag-110m half-life. 2162500400012 (ERR-14) Random statistical uncertainty of 2162500400013 Ag-110m activity measurement without Cd 2162500400014 (at confidence level 99%). 2162500400015 (ERR-15)) Random statistical uncertainty of 2162500400016 Ag-110m activity measurement with Cd 2162500400017 (at confidence level 99%). 2162500400018 STATUS (TABLE) Table 1 of NSE,72,357,1979 2162500400019 HISTORY (20151213A) SD:Co-60m -> Co-60g in DECAY-MON. SF8=MXW 2162500400020 deleted from REACTION code denominator. EN-DUMMY -> 2162500400021 EN-DUM-DN; EN-MIN-NM added. 2162500400022 ENDBIB 20 0 2162500400023 COMMON 3 3 2162500400024 ERR-10 ERR-14 ERR-15 2162500400025 PER-CENT PER-CENT PER-CENT 2162500400026 1. 1. 1. 2162500400027 ENDCOMMON 3 0 2162500400028 DATA 6 1 2162500400029 EN-DUM-DN EN-MIN-NM DATA ERR-T MONIT MONIT-ERR 2162500400030 EV EV NO-DIM NO-DIM NO-DIM NO-DIM 2162500400031 0.0253 0.5 15.5 0.8 1.58 0.06 2162500400032 ENDDATA 3 0 2162500400033 ENDSUBENT 32 0 2162500499999 ENDENTRY 4 0 2162599999999