ENTRY 23524 20190603 22802352400000001 SUBENT 23524001 20190603 22802352400100001 BIB 13 27 2352400100002 TITLE The use of cobalt as an accurate thermal neutron flux 2352400100003 monitor 2352400100004 AUTHOR (N.K.Taylor, J.K.Linacre) 2352400100005 REFERENCE (R,AERE-R-4111,1964) 2352400100006 INSTITUTE (2UK HAR) 2352400100007 FACILITY (REAC,2UK HAR) GLEEP and BEPO reactors 2352400100008 INC-SPECT GLEEP: 2352400100009 Cd ratio for Au was determined to be 2.17+-0.03. 2352400100010 Ratio of thermal to total neutron density 0.942 was 2352400100011 determined; using value 0.974 of Littler, the mean 2352400100012 average is 0.958 . 2352400100013 . Neutron spectra in GLEEP and BEPO are probaly 2352400100014 sufficiently similar ( authors comment on page 20 ). 2352400100015 SAMPLE . GLEEP: 2352400100016 Four Au foils of ~1.8 mg/cm2 thickness, ~1 cm2 area. 2352400100017 Samples 1 and 2 were irradiated without Cd, 2352400100018 3 and 4 - with 1 mm thick Cd cover at the same 2352400100019 position. 2352400100020 DETECTOR (GEMUC) .with 7 mg/cm2 window, for beta-counting of Au.2352400100021 RaD standard source was counted periodically during 2352400100022 foil counting. 2352400100023 METHOD (ACTIV) 2352400100024 DECAY-DATA (27-CO-60-G,5.23YR) 2352400100025 (79-AU-198-G,2.7D) 2352400100026 CORRECTION For paralysis, background, decay. 2352400100027 ADD-RES Self-shielding factors. 2352400100028 HISTORY (20190604C) M.M. 2352400100029 ENDBIB 27 0 2352400100030 NOCOMMON 0 0 2352400100031 ENDSUBENT 30 0 2352400199999 SUBENT 23524002 20190604 22802352400200001 BIB 6 44 2352400200002 REACTION 1(27-CO-59(N,X)27-CO-60,,SIG,,MXW) 2352400200003 2(27-CO-59(N,X)27-CO-60,,SIG,,MXW) 2352400200004 3(27-CO-59(N,X)27-CO-60,,SIG,,MXW) 2352400200005 SAMPLE . BEPO: 2352400200006 The same Au as at GLEEP 2352400200007 Co wire of 0.010 inch diameter. 2352400200008 DETECTOR (SCIN) Sodium iodine scintillation counter for gamma 2352400200009 radiation of Co wires. Standard Co sources were used 2352400200010 for calibration. 2352400200011 METHOD 1 Experiment 1 2352400200012 Cd ratio for Au 2.28 2352400200013 Cd ratio for Co 15.5 2352400200014 Bare Au foil activity,count/min/mg 4.937E+5 2352400200015 Thermal Au foil activity,count/min/mg 2.770E+5 2352400200016 Westcott thermal dose,n/cm2 2.388E+15 2352400200017 Co sample activity,microCurie 0.0951 2352400200018 Thermal Co sample activity,microCurie 0.0890 2352400200019 2 Experiment 2 2352400200020 Cd ratio for Au 2.33 2352400200021 Cd ratio for Co 16.5 2352400200022 Bare Au foil activity,count/min/mg 4.495E+5 2352400200023 Thermal Au foil activity,count/min/mg 2.567E+5 2352400200024 Westcott thermal dose,n/cm2 2.213E+15 2352400200025 Co sample activity,microCurie 0.0935 2352400200026 Thermal Co sample activity,microCurie 0.0880 2352400200027 3 Experiment 3 2352400200028 Cd ratio for Au 2.32 2352400200029 Cd ratio for Co 16.5 2352400200030 Bare Au foil activity,count/min/mg 4.449E+5 2352400200031 Thermal Au foil activity,count/min/mg 2.531E+5 2352400200032 Westcott thermal dose,n/cm2 2.182E+15 2352400200033 Co sample activity,microCurie 0.0867 2352400200034 Thermal Co sample activity,microCurie 0.0814 2352400200035 ERR-ANALYS (DATA-ERR) Includes counting errors and manipulation of2352400200036 data. 2352400200037 (ERR-1) Cd ratio for Au 2352400200038 (ERR-2) Cd ratio for Co 2352400200039 (ERR-3) Bare Au foil activity at Co irradiation 2352400200040 position 2352400200041 (ERR-4) Thermal Au foil activity at Co irradiation 2352400200042 position 2352400200043 (ERR-5) Co sample activity 2352400200044 (ERR-6) Co sample thermal neutron induced activity 2352400200045 STATUS (TABLE) Table VI of Rep.AERE-R-4111,1964 2352400200046 ENDBIB 44 0 2352400200047 COMMON 5 3 2352400200048 EN-DUMMY ERR-1 ERR-2 ERR-3 DATA-ERR 2352400200049 EV PER-CENT PER-CENT PER-CENT PER-CENT 2352400200050 0.0253 1.4 1.7 1.7 2.2 2352400200051 ENDCOMMON 3 0 2352400200052 DATA 6 1 2352400200053 DATA 1DATA 2DATA 3ERR-4 ERR-5 ERR-6 2352400200054 B B B PER-CENT PER-CENT PER-CENT 2352400200055 32.69 34.18 32.66 1.7 1. 1.2 2352400200056 ENDDATA 3 0 2352400200057 ENDSUBENT 56 0 2352400299999 SUBENT 23524003 20190604 22802352400300001 BIB 4 8 2352400300002 REACTION (27-CO-59(N,X)27-CO-60,,SIG,,MXW) 2352400300003 ANALYSIS Mean value for 3 experiments 2352400300004 ERR-ANALYS (ERR-T) Total error 2352400300005 (ERR-1) Counting and manipulation data 2352400300006 (ERR-2) GLEEP calibration 2352400300007 (ERR-3) Standard Co sources 2352400300008 STATUS (TABLE) Table VI of Rep.AERE-R-4111,1964 2352400300009 (DEP,23524002) Data of experiments 1-3 . 2352400300010 ENDBIB 8 0 2352400300011 COMMON 1 3 2352400300012 EN-DUMMY 2352400300013 EV 2352400300014 0.0253 2352400300015 ENDCOMMON 3 0 2352400300016 DATA 6 1 2352400300017 DATA ERR-T ERR-T ERR-1 ERR-2 ERR-3 2352400300018 B B PER-CENT PER-CENT PER-CENT PER-CENT 2352400300019 33.2 1.7 5.1 2.2 3.2 4. 2352400300020 ENDDATA 3 0 2352400300021 ENDSUBENT 20 0 2352400399999 SUBENT 23524004 20190604 22802352400400001 BIB 6 17 2352400400002 REACTION (27-CO-59(N,X)27-CO-60,,SIG,,MXW) 2352400400003 SAMPLE . BEPO: 2352400400004 Co-Al alloys: 2352400400005 1 - 0.099 % Co, 0.050 inch diameter, 2352400400006 2 - 0.745 % Co, 0.026 inch diameter; 2352400400007 Accuracy of content +-2.% . 2352400400008 Pure Co of 0.010 inch diameter. 2352400400009 METHOD Irradiation time 24 hr or 50 hr at E6 hole of BEPO. 2352400400010 Cooling time 3-4 weeks. 2352400400011 Cd ratios - 9.27 for Co-Al alloy of 0.745%, 106 for 2352400400012 Co-Al alloy 0.099%, 16.3 for 0.010 in diameter Co wire.2352400400013 DETECTOR (SCIN) Sodium iodine scintillation counter for gamma 2352400400014 radiation of Co wires. Standard Co sources were used 2352400400015 for calibration. 2352400400016 FLAG (1.) 0.745% alloy 2352400400017 (2.) 0.099% alloy 2352400400018 STATUS (TABLE) Text,page 11 of Rep.AERE-R-4111,1964 2352400400019 ENDBIB 17 0 2352400400020 COMMON 1 3 2352400400021 EN-DUMMY 2352400400022 EV 2352400400023 0.0253 2352400400024 ENDCOMMON 3 0 2352400400025 DATA 2 2 2352400400026 DATA FLAG 2352400400027 B NO-DIM 2352400400028 37.5 1. 2352400400029 36.5 2. 2352400400030 ENDDATA 4 0 2352400400031 ENDSUBENT 30 0 2352400499999 SUBENT 23524005 20190604 22802352400500001 BIB 4 5 2352400500002 REACTION (27-CO-59(N,X)27-CO-60,,SIG,,SPA) 2352400500003 ANALYSIS Bare sample activation cross section. 2352400500004 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 2352400500005 article. 2352400500006 STATUS (TABLE) Text, page 18 of Rep.AERE-R-4111,1964 2352400500007 ENDBIB 5 0 2352400500008 COMMON 1 3 2352400500009 EN-DUMMY 2352400500010 EV 2352400500011 0.0253 2352400500012 ENDCOMMON 3 0 2352400500013 DATA 2 1 2352400500014 DATA DATA-ERR 2352400500015 B B 2352400500016 36.3 1.5 2352400500017 ENDDATA 3 0 2352400500018 ENDSUBENT 17 0 2352400599999 ENDENTRY 5 0 2352499999999