ENTRY 13844 20020812 00001384400000001 SUBENT 13844001 20020812 00001384400100001 BIB 16 35 1384400100002 INSTITUTE (1USABNL) 1384400100003 REFERENCE (J,NSE,14,224,1962) 1384400100004 AUTHOR (E.Starr,J.Koppel) 1384400100005 TITLE Determination of Diffusion Hardening in Water. 1384400100006 FACILITY (REAC,1USABNL) Brookhaven Graphite Reactor 1384400100007 INC-SOURCE (REAC) 1384400100008 INC-SPECT Thermal spectrum with a flux at reactor face ~1E+7 1384400100009 neutrons/(cm2.s). 1384400100010 SAMPLE H3BO3 poisoned demineralized water in a cylindrical 1384400100011 tank, 5.5 ft in diam. by 5 ft high, situated atop the 1384400100012 graphite face of the reactor. 1384400100013 METHOD (ACTIV) Measured diffusion length as a function of 1384400100014 boric acid concentration by activation of In foils. 1384400100015 Relative flux measured with bare indium foils placed 1384400100016 on a line perpendicular to the plane source. Effect 1384400100017 of epicadmium neutrons determined with a cadmium 1384400100018 sheet positioned between source and water tank. 1384400100019 DETECTOR (PROPC) Four gas flow proportional counters. 1384400100020 ANALYSIS Corrected relative activity of foils least square 1384400100021 fitted to exponential spatial distribution to find 1384400100022 relaxation length. 1384400100023 Relaxation length corrected for leakage effect using 1384400100024 data obtained from radial activity fit. 1384400100025 Absorption cross section derived from least square 1384400100026 fit to the set of experimental points. 1384400100027 MONITOR Detectors calibrated using standard source. 1384400100028 CORRECTION Activity of the foils corrected for: 1384400100029 . counter dead time 1384400100030 . counter background 1384400100031 . known indium decay 1384400100032 Relaxation length correction due to leakage effect 1384400100033 greatest (0.6%) for pure water data. 1384400100034 ERR-ANALYS (DATA-ERR) Absolute uncertainties given. 1384400100035 STATUS Data taken from reference. 1384400100036 HISTORY (20020730C) IS 1384400100037 ENDBIB 35 0 1384400100038 NOCOMMON 0 0 1384400100039 ENDSUBENT 38 0 1384400199999 SUBENT 13844002 20020812 00001384400200001 BIB 1 1 1384400200002 REACTION (1-H-1(N,G)1-H-2,,SIG,,SPA,DERIV) 1384400200003 ENDBIB 1 0 1384400200004 NOCOMMON 0 0 1384400200005 DATA 3 1 1384400200006 EN-DUMMY DATA DATA-ERR 1384400200007 EV MB MB 1384400200008 0.0253 326.9 1.6 1384400200009 ENDDATA 3 0 1384400200010 ENDSUBENT 9 0 1384400299999 ENDENTRY 2 0 1384499999999