ENTRY 40295 20210830 42024029500000001 SUBENT 40295001 20210830 42024029500100001 BIB 12 30 4029500100002 INSTITUTE (4RUSEPA) 4029500100003 REFERENCE (C,73KIEV,2,131,1973) Data are given. 4029500100004 No INDC(CCP) rep. for 73KIEV at NDS web-site. 4029500100005 AUTHOR (V.V.Ovechkin,D.F.Rau,V.S.Rudenko) 4029500100006 TITLE Measurement of the activation cross section of Tc-99 4029500100007 by the thermal neutrons 4029500100008 INC-SOURCE (PU-BE) Pu238-Be neutron source of 1.E+8 n/sec. 4029500100009 Installed in paraffin block surrounded by water. 4029500100010 METHOD (ACTIV) 4029500100011 DETECTOR (SCIN) Two scintillation detectors NaI(Tl) of 150 mm 4029500100012 diameter, 100 mm long and 63 mm diameter 63 mm long. 4029500100013 (GELI) Germanium-lithium detector with sensitive volume4029500100014 27 cm**3. 4029500100015 ANALYSIS (AREA) 4029500100016 MONITOR (25-MN-55(N,G)25-MN-56,,SIG) 4029500100017 Activation cross section(half-life 2.57 hr) 13.3 b. 4029500100018 (13-AL-27(N,G)13-AL-28,,SIG) 4029500100019 Activation cross section (half-life 2.24 min) 0.220b. 4029500100020 Two monitors were used for thermal neutron flux at samp4029500100021 position by gamma spectrometer calibrated by standard 4029500100022 gamma-sources. 4029500100023 Neutron flux average for several runs - 4029500100024 (2.48+-0.11)*10**5 n/(cm2*sec) 4029500100025 CORRECTION Gamma-rays from admixtures of the sample were taken 4029500100026 into account 4029500100027 ERR-ANALYS (DATA-ERR) Statistical and normalization errors were 4029500100028 taken into account 4029500100029 HISTORY (19750512C) Compiled at the centre 4029500100030 (20210831A) M.M. Correction for current rules and 4029500100031 dictionaries. 4029500100032 ENDBIB 30 0 4029500100033 NOCOMMON 0 0 4029500100034 ENDSUBENT 33 0 4029500199999 SUBENT 40295002 20210830 42024029500200001 BIB 5 13 4029500200002 REACTION (43-TC-99(N,G)43-TC-100,,SIG) 4029500200003 Activation cross section 4029500200004 SAMPLE Metallic powder and powder KTcO(4) were used. 4029500200005 Weight < 70 mg. 4029500200006 DECAY-DATA (43-TC-100,,DG,540.,,DG,591.) 4029500200007 Ratio of intensities I540/I591= 1:0.86. 4029500200008 REL-REF (A,,C.M.Lederer+,B,LEDERER-6,,,1967) and 4029500200009 D.J.Hughes,R.B.Schwartz,Neutron Cross sections, N.Y., 4029500200010 BNL,1958 - agree well. 4029500200011 Disagree with value 100+-25 b from Nucl.Handbook, 4029500200012 ed.O.R.Frisch, London,1958. 4029500200013 STATUS (TABLE) Text page 135 of 4029500200014 Conf.Proc. 73KIEV, v.2, p.131, 1973 4029500200015 ENDBIB 13 0 4029500200016 NOCOMMON 0 0 4029500200017 DATA 5 1 4029500200018 EN DATA DATA-ERR MONIT1 MONIT2 4029500200019 EV B B B B 4029500200020 2.5300E-02 24. 4. 13.3 0.220 4029500200021 ENDDATA 3 0 4029500200022 ENDSUBENT 21 0 4029500299999 ENDENTRY 2 0 4029599999999