ENTRY 31515 20160929 31753151500000001 SUBENT 31515001 20160929 31753151500100001 BIB 17 63 3151500100002 INSTITUTE (3ARGCAB) 3151500100003 REFERENCE (J,JRN,244,417,2000) Data are given 3151500100004 (J,RCA,78,11,1997) Some details of method are given 3151500100005 (J,NSE,127,245,1997) Details of the activity 3151500100006 measurements, the calculations of cross sections and 3151500100007 the evaluation of systematic uncertainties are given. 3151500100008 They are coded under INC-SPECT, DETECTOR, MONITOR and 3151500100009 DECAY-MON 3151500100010 AUTHOR (M.A.Arribere,I.M.Cohen,A.J.Kestelman, 3151500100011 S.Ribeiro Guevara) 3151500100012 TITLE Use of the absolute parametric method to evaluate 3151500100013 the analytic significance of threshold reactions 3151500100014 on P, Si, Al and Mg by NAA 3151500100015 FACILITY (REAC,3ARGCAB) 3151500100016 INC-SOURCE (REAC) Neutrons from RA-6 materials test reactor 3151500100017 at Centre Atomico Barilochi with thermal neutron flux 3151500100018 about 6.0E+12 neutrons/cm**2/sec, epithermal neutron 3151500100019 flux about 3.0E+11 neutrons/cm**2/sec and fast neutron 3151500100020 flux about 2.0E+12 neutrons/cm**2/sec 3151500100021 INC-SPECT Undisturbed U-235 fission spectrum. Set of 8 3151500100022 activation detectors having thresholds from 2.6 to 3151500100023 11.6 MeV were used to show that flux of fission 3151500100024 neutrons is undisturbed 3151500100025 SAMPLE High purity metallic (Al - 99.9998% purity, Mg, Si - 3151500100026 spectrographic purity) and pure chemical compounds 3151500100027 (SiO2, PO4KH2, PO4K2H) dried and kept in a 3151500100028 desiccator up to a moment of irradiation 3151500100029 METHOD (ACTIV) Activation method with registration of 3151500100030 secondary gamma-ray spectra. 3151500100031 DETECTOR (HPGE) 67 cm*3 ORTEC high-purity germanium intrinsic-N 3151500100032 coaxial detector with resolution 2 keV at 1.33 MeV. 3151500100033 The detector absolute efficiency curve was obtained 3151500100034 with IAEA standard sources (Am-241, Ba-133, Co-60, 3151500100035 Cs-137, Eu-152) calibrated within 2 per-cent 3151500100036 uncertainty. Ra-226 source was also used 3151500100037 MONITOR (28-NI-58(N,P)27-CO-58,,SIG,,FIS) 3151500100038 MONIT-REF (,J.H.Baard+,B,BAARD,,1989) 3151500100039 DECAY-MON (27-CO-58-G,70.82D,DG,810.772,.9944) From MONIT-REF. 3151500100040 Gamma self-attenuation factor for 811.79 keV line in 3151500100041 nickel foil and wire was calculated as 0.992 3151500100042 and 0.981, respectively. 3151500100043 ERR-ANALYS (ERR-T) The total uncertainty was determined by 3151500100044 propagation of the following partial uncertainties. 3151500100045 (ERR-S) The statistical component was obtained as 3151500100046 weighed averaged for few measurements. 3151500100047 (MONIT-ERR) reference cross section ( 2.8% ) 3151500100048 (ERR-1,2.,3.) 2 to 3% - uncertainty in the detector 3151500100049 absolute efficiency determination 3151500100050 - other systematic uncertainties 3151500100051 CORRECTION Irradiation of bare and cadmium covered samples in the 3151500100052 reactor core, and of bare samples in the thermal 3151500100053 column were used for the investigation of the 3151500100054 impurities which could respectively interfere, through 3151500100055 (n,gamma) or threshold reactions, the measurement 3151500100056 of the cross sections 3151500100057 STATUS Data from main reference. 3151500100058 HISTORY (20010507C) Compiled by VP 3151500100059 (20011105U) OS. STATUS and MONIT-REF added, other small3151500100060 BIB changes. 3151500100061 (20090604A) SD: shifted opening parenthesis from 3151500100062 column 12 in SAMPLE 3151500100063 (20160922U) VS. SF4 in MONITOR corrected. 3151500100064 Coded info in ERR-ANALYS added. 3151500100065 ENDBIB 63 0 3151500100066 COMMON 3 3 3151500100067 KT-DUMMY MONIT MONIT-ERR 3151500100068 MEV MB MB 3151500100069 1.32 111. 3. 3151500100070 ENDCOMMON 3 0 3151500100071 ENDSUBENT 70 0 3151500199999 SUBENT 31515002 20010507 00003151500200001 BIB 4 6 3151500200002 REACTION (12-MG-24(N,P)11-NA-24,,SIG,,FIS) 3151500200003 DECAY-DATA (11-NA-24,14.9590HR,DG,1368.60,1.0) 3151500200004 ANALYSIS The measurements of Mg-24(n,p) cross section was done 3151500200005 for testing of the methodology. Good agreement with 3151500200006 the results of latest measurements was obtained 3151500200007 ERR-ANALYS Total uncertainty is given 3151500200008 ENDBIB 6 0 3151500200009 NOCOMMON 0 0 3151500200010 DATA 2 1 3151500200011 DATA ERR-T 3151500200012 MB MB 3151500200013 1.441 0.092 3151500200014 ENDDATA 3 0 3151500200015 ENDSUBENT 14 0 3151500299999 SUBENT 31515003 20010507 00003151500300001 BIB 3 6 3151500300002 REACTION (12-MG-25(N,P)11-NA-25,,SIG,,FIS) 3151500300003 DECAY-DATA (11-NA-25,59.1SEC,DG,389.698,0.1265) 3151500300004 (11-NA-25,59.1SEC,DG,585.032,0.1296) 3151500300005 (11-NA-25,59.1SEC,DG,974.720,0.1489) 3151500300006 (11-NA-25,59.1SEC,DG,1611.703,0.0945) 3151500300007 ERR-ANALYS Total uncertainty is given 3151500300008 ENDBIB 6 0 3151500300009 NOCOMMON 0 0 3151500300010 DATA 2 1 3151500300011 DATA ERR-T 3151500300012 MB MB 3151500300013 1.57 0.12 3151500300014 ENDDATA 3 0 3151500300015 ENDSUBENT 14 0 3151500399999 SUBENT 31515004 20010507 00003151500400001 BIB 4 6 3151500400002 REACTION (13-AL-27(N,P)12-MG-27,,SIG,,FIS) 3151500400003 DECAY-DATA (12-MG-27,9.458MIN,DG,843.762,0.731) 3151500400004 ANALYSIS The measurements of Al-27(n,p) cross section was done 3151500400005 for testing of the methodology. Good agreement with 3151500400006 the results of latest measurements was obtained 3151500400007 ERR-ANALYS Statistical and total uncertainties are given 3151500400008 ENDBIB 6 0 3151500400009 NOCOMMON 0 0 3151500400010 DATA 2 1 3151500400011 DATA ERR-T 3151500400012 MB MB 3151500400013 3.84 0.18 3151500400014 ENDDATA 3 0 3151500400015 ENDSUBENT 14 0 3151500499999 SUBENT 31515005 20010507 00003151500500001 BIB 4 6 3151500500002 REACTION (13-AL-27(N,A)11-NA-24,,SIG,,FIS) 3151500500003 DECAY-DATA (11-NA-24,14.9590HR,DG,1368.60,1.0) 3151500500004 ANALYSIS The measurements of Al-27(n,a) cross section was done 3151500500005 for testing of the methodology. Good agreement with 3151500500006 the results of latest measurements was obtained 3151500500007 ERR-ANALYS Statistical and total uncertainties are given 3151500500008 ENDBIB 6 0 3151500500009 NOCOMMON 0 0 3151500500010 DATA 2 1 3151500500011 DATA ERR-T 3151500500012 MB MB 3151500500013 0.721 0.028 3151500500014 ENDDATA 3 0 3151500500015 ENDSUBENT 14 0 3151500599999 SUBENT 31515006 20010507 00003151500600001 BIB 4 5 3151500600002 REACTION (14-SI-28(N,P)13-AL-28,,SIG,,FIS) 3151500600003 DECAY-DATA (13-AL-28,2.2414MIN,DG,1778.99,1.0) 3151500600004 ANALYSIS Result of weighted avarage for 4 Si and 3 SiO2 samples 3151500600005 measurements 3151500600006 ERR-ANALYS Total uncertainty is given 3151500600007 ENDBIB 5 0 3151500600008 NOCOMMON 0 0 3151500600009 DATA 2 1 3151500600010 DATA ERR-T 3151500600011 MB MB 3151500600012 5.68 0.25 3151500600013 ENDDATA 3 0 3151500600014 ENDSUBENT 13 0 3151500699999 ENDENTRY 6 0 3151599999999