ENTRY 23553 20200415 22872355300000001 SUBENT 23553001 20200415 22872355300100001 BIB 11 19 2355300100002 TITLE The yield of Cs137 in the pile neutron fission of 2355300100003 natural uranium 2355300100004 AUTHOR (F.Brown) 2355300100005 REFERENCE (J,JIN,1,248,1955) 2355300100006 INSTITUTE (2UK HAR) 2355300100007 FACILITY (REAC,2UK HAR) BEPO 2355300100008 INC-SOURCE (REAC) Pile neutrons. No other information in the 2355300100009 article. 2355300100010 SAMPLE Four peaces of U rod, ~2mm diameter, ~1 g weight. 2355300100011 Two were irradiated two weeks, and two - four weeks. 2355300100012 DETECTOR (D4PI) Methane flow 4PI proportional counter. 2355300100013 METHOD (CHSEP) Cooling time ~ a week. Dissolved in nitric acid2355300100014 containing 2.24 mg of Ba++ and 2.46 mg of Cs+. 2355300100015 Details of chemical separation - given in the article. 2355300100016 CORRECTION For counting losses ( < 0.5% for Ba), 2355300100017 for background ( <1.% for Ba), 2355300100018 for aliquots and chemical yield, 2355300100019 self-absorption (< 0.5 % for Ba, < 2.% for Cs) 2355300100020 HISTORY (20200415C) M.M. 2355300100021 ENDBIB 19 0 2355300100022 NOCOMMON 0 0 2355300100023 ENDSUBENT 22 0 2355300199999 SUBENT 23553002 20200415 22872355300200001 BIB 5 25 2355300200002 REACTION ((92-U-235(N,F)55-CS-137,CUM,FY)/ 2355300200003 (92-U-235(N,F)56-BA-140,CUM,FY)) 2355300200004 DECAY-DATA (56-BA-140,12.8D) 2355300200005 (56-BA-137-M,2.6MIN) 2355300200006 (55-CS-137,30.0YR) 2355300200007 FLAG (1.) Irradiation time 2 weeks 2355300200008 (2.) Irradiation time 2 weeks 2355300200009 (3.) Irradiation time 4 weeks 2355300200010 (4.) Irradiation time 4 weeks 2355300200011 (5.) Mean of four measurements 2355300200012 ERR-ANALYS (DATA-ERR) Average deviation of four results. 2355300200013 Random errors ( total 1.1 %) : 2355300200014 (ERR-2) Statistical fluctuation in counting 2355300200015 (ERR-3) Deviation between sources 2355300200016 (ERR-4) Chemical yield of Ba 2355300200017 (ERR-5) Chemical yield of Cs 2355300200018 (ERR-6) Aliquots and dilutions 2355300200019 Systematic errors: 2355300200020 (+ERR-1) Relative activities due to self-absorption 2355300200021 (ERR-7) Relative activities due to film absorption 2355300200022 Additional error in Cs HL 30.0 yr +0.3 yr -0.4 yr. 2355300200023 (ERR-T) Total error 2355300200024 STATUS (TABLE) Table 2 of 2355300200025 Journal of Inorganic and Nuclear Chemistry, 2355300200026 v.1,p.248,1955 2355300200027 ENDBIB 25 0 2355300200028 COMMON 8 6 2355300200029 EN-DUMMY +ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2355300200030 ERR-6 ERR-7 2355300200031 MEV PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2355300200032 PER-CENT PER-CENT 2355300200033 1. 2.0 0.3 0.5 0.5 0.5 2355300200034 0.5 0.5 2355300200035 ENDCOMMON 6 0 2355300200036 DATA 5 5 2355300200037 DATA DATA-ERR FLAG +ERR-T -ERR-T 2355300200038 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 2355300200039 0.966 1. 2355300200040 0.985 2. 2355300200041 0.987 3. 2355300200042 1.003 4. 2355300200043 0.985 0.010 5. 0.03 0.02 2355300200044 ENDDATA 7 0 2355300200045 ENDSUBENT 44 0 2355300299999 ENDENTRY 2 0 2355399999999