ENTRY 21200 20060809 21782120000000001 SUBENT 21200001 20060809 21782120000100001 BIB 14 71 2120000100002 INSTITUTE (2UK NPL) 2120000100003 REFERENCE (J,JNE,25,557,197111) REVISED DATA USING NEW SOURCE 2120000100004 ENERGY. 2120000100005 (J,JNE/AB,20,249,196604) CONTAINS SUPERSEDED DATA AND 2120000100006 ALL EXPERIMENTAL DETAILS. 2120000100007 AUTHOR (T.B.RYVES,J.C.ROBERTSON,E.J.AXTON,I.GOODIER, 2120000100008 A.WILLIAMS) 2120000100009 TITLE -THE AU-197(N,G)AU-198 CROSS-SECTION AT 22.8 KEV- 2120000100010 FACILITY .NONE. 2120000100011 INC-SOURCE (PHOTO) SB-BE PHOTONEUTRON SOURCE MADE AT AWRE 2120000100012 CONSISTING OF SOLID SPHERE OF ANTIMONY 2120000100013 1.75 CM IN DIAMETER WITH A CLOSELY FITTING 2120000100014 BERYLLIUM SHELL 3.00+-0.02 MM THICK. 2120000100015 SOURCE STRENGTH (6.46+-0.04)E+05 N/SEC AT START2120000100016 OF IRRADIATIONS AND CALCULATED USING SB-124 2120000100017 HALF-LIFE OF 60.2+-0.3 D THEREAFTER. 2120000100018 SAMPLE .TWO MATCHED PAIRS OF THIN HEMISPHERICAL SHELLS, ONE 2120000100019 SET FITTING EXACTLY ROUND THE SOURCE, THE OTHER OF 2120000100020 RADIUS 10 CM. 2120000100021 .AFTER IRRADIATION BACKING WAS DISSOLVED AND GOLD 2120000100022 MELTED TO MAKE DISCS (0.75 INCH DIAMETER, 0.005 INCH 2120000100023 THICK, OR 1.5 INCH DIAMETER, 0.17 INCH THICK) FOR 2120000100024 GAMMA COUNTING AND FOILS (0.875 INCH DIAMETER, 0.001 2120000100025 INCH THICK) FOR BETA COUNTING. 2120000100026 METHOD (ACTIV) ACTIVATION. ONE WEEK IRRADIATIONS ON ROOF 2120000100027 OF NPL. 2120000100028 DETECTOR (PROPC) 4-PI BETA PROPORTIONAL COUNTER TO COUNT BETA 2120000100029 ACTIVITY OF THIN FOILS. DETECTOR CALIBRATED 2120000100030 BY RE-IRRADIATING THE FOILS IN A REACTOR AND 2120000100031 COUNTING IN A 4-PI BETA/GAMMA COINCIDENCE 2120000100032 ARRANGEMENT. 2120000100033 GAMMA SPECTROMETER TO MEASURE GAMMA ACTIVITY 2120000100034 OF THICK SAMPLES RELATIVE TO A VERY THIN HIGH 2120000100035 ACTIVITY AU-198 SAMPLE WHICH WAS ABSOLUTELY 2120000100036 CALIBRATED IN A 4-PI BETA/GAMMA COINCIDENCE 2120000100037 ARRANGEMENT. ALLOWANCE MADE FOR DIFFERENCES 2120000100038 IN SAMPLE GEOMETRIES. 2120000100039 PART-DET (B) DECAY BETAS. 2120000100040 (DG) DECAY GAMMAS. 2120000100041 CORRECTION .LARGE NUMBER OF CORRECTIONS INCLUDING- 2120000100042 INCREASE IN NEUTRON PATH LENGTH BY SCATTERING IN THE 2120000100043 GOLD (1.0 PERCENT FOR SMALL SHELL, 2.0 PC FOR LARGE). 2120000100044 SCATTERING IN COPPER BACKING (2.8 PC FOR BOTH SMALL 2120000100045 SHELLS, 11.8 AND 8.4 PC FOR LARGE). 2120000100046 ROOF SCATTERING BACKGROUND (NEGLIGIBLE FOR SMALL, 2120000100047 2.9 PERCENT FOR LARGE). 2120000100048 AIR-SCATTERING BACKGROUND (NEGLIGIBLE FOR SMALL, 2120000100049 0.5 PERCENT FOR LARGE). 2120000100050 SCATTERING IN ALUMINIUM CAN ROUND LARGE SHELLS 2120000100051 (0.5 PERCENT). 2120000100052 SMALL SHELLS AFFECTED BY CONTAMINATION FROM THE 2120000100053 SOURCE (3 PERCENT AND 0.7 PERCENT). 2120000100054 RESONANCE SELF-PROTECTION (LESS THAN 0.1 PERCENT). 2120000100055 NEUTRON COMPONENT OF ENERGY 380 KEV (3.3 PERCENT). 2120000100056 NO CORRECTION FOR COMPTON SCATTERING OF 1.69 MEV 2120000100057 GAMMAS IN THE SOURCE PRODUCING EXTRA NEUTRONS. 2120000100058 NO CORRECTION FOR INELASTIC SCATTERING OF SOURCE 2120000100059 NEUTRONS FROM 20 KEV SB LEVEL. 2120000100060 SMALL CORRECTION FOR SOURCE POSITIONING IN ONE CASE. 2120000100061 ERR-ANALYS .COMPREHENSIVE BREAKDOWN OF ERRORS FOR CORRECTIONS IN 2120000100062 TABLE 3 OF JNE,20,249,6604. 2120000100063 .FOR NEW DATA ERRORS ARE- 2120000100064 (ERR-S) RANDOM ERROR. 2120000100065 (ERR-1) SYSTEMATIC ERROR. 2120000100066 (ERR-T) TOTAL ERROR. 2120000100067 STATUS (NDD) FROM NEUDADA. 2120000100068 HISTORY (19791130T) 2120000100069 (19800110E) 2120000100070 (19810504A) 2120000100071 (19810722E) 2120000100072 (20060809A) DATE and two reference codes corrected 2120000100073 ENDBIB 71 0 2120000100074 NOCOMMON 0 0 2120000100075 ENDSUBENT 74 0 2120000199999 SUBENT 21200002 20060809 21782120000200001 BIB 3 10 2120000200002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,AV) 2120000200003 STATUS .DATA FROM TEXT OF PUBLICATION. 2120000200004 .OLD DATA WAS 640 MB +-7 MB RANDOM, +-18 MB 2120000200005 SYSTEMATIC. 2120000200006 HISTORY (19791130T) 2120000200007 (19800110E) 2120000200008 (19810504A) 2120000200009 (19810722E) 2120000200010 (19860808U)HH 2120000200011 (19860822E) 2120000200012 ENDBIB 10 0 2120000200013 NOCOMMON 0 0 2120000200014 DATA 5 1 2120000200015 EN DATA ERR-S ERR-1 ERR-T 2120000200016 KEV MB MB MB MB 2120000200017 2.2800E+01 6.8400E+02 5.0000E+00 1.2000E+01 1.3000E+01 2120000200018 ENDDATA 3 0 2120000200019 ENDSUBENT 18 0 2120000299999 ENDENTRY 2 0 2120099999999