ENTRY O0595 20021004 0000O059500000001 SUBENT O0595001 20021004 0000O059500100001 BIB 12 41 O059500100002 TITLE Distribution of Nuclear Charge in the Proton-Induced O059500100003 Fission of Th-232. O059500100004 AUTHOR (A.KJELBERG, H.TANIGUCHI, L.YAFFE) O059500100005 INSTITUTE (1CANMCG) O059500100006 REFERENCE (J,CJC,39,635,1961) O059500100007 HISTORY (19991011C) O059500100008 (19991117A) Date is Corrected O059500100009 (20021004U) Last checking has been done. O059500100010 SAMPLE Three Thorium Metal Foils of About 200 mg/cm**2 Super- O059500100011 Ficial Density were Used. O059500100012 FACILITY (SYNCY,1CANMCG) 82-In. Synchrocyclotron Og Mcgill. O059500100013 METHOD (CHSEP) O059500100014 In Case of the Semishielded Isotopes, Two Separations OO059500100015 The Nuclide in Question were Performed from the Same O059500100016 Master Solution. The First Sample Contained the ActivitO059500100017 Formed Independently and That Produced by Decay During O059500100018 Bombardment and in the Short Time Interval Before the O059500100019 Separation from the Precursor in the Chain. The Second O059500100020 Sample Contained Activity Formed by Decay of the O059500100021 Precursor Only and Gave Information on the Chain Yield.O059500100022 Complete Separation of the Nuclide from Its Precursor O059500100023 And Accurate Timing of the Separations were Essential. O059500100024 (ACTIV) Irradiation Time Varied from 1/2 to 1 Hour. O059500100025 (INTB) O059500100026 STATUS (TABLE) O059500100027 CORRECTION Corrections For Energy Loss For the Protons in the O059500100028 Target Itself were Calculated. O059500100029 ANALYSIS (DECAY) O059500100030 ERR-ANALYS The Errors Associated with the Fractional Yield Data O059500100031 Are Due Mainly to Uncertainty in the Exact Proton O059500100032 Energy at Which the Bombardments were Made Due to the O059500100033 Radial Distribution of the Proton Beam and Energy O059500100034 Losses in the Target Itself.Nevertheless the Beam O059500100035 Energy was Probably Known to 2-5 MeV.The DisintegrationO059500100036 Rates were Measured Relatively So That Errors O059500100037 Associated with these are Small Approx. 1%.The O059500100038 Graphical Decay Curve Analyses Associated ExtrapolationO059500100039 Data and Chemical Analyses,Present No Difficulties and O059500100040 These Errors are Certainly Less Than 5%.It is Believed O059500100041 That an Uncertainty of +-10-15% on an Over-All Basis O059500100042 Would Cover the Above and Include Systematic Errors. O059500100043 ENDBIB 41 0 O059500100044 NOCOMMON 0 0 O059500100045 ENDSUBENT 44 0 O059500199999 SUBENT O0595002 20021004 0000O059500200001 BIB 5 26 O059500200002 REACTION ((90-TH-232(P,F)31-GA-72,IND,SIG)/ O059500200003 (90-TH-232(P,F)MASS,,SIG)) O059500200004 RAD-DET (31-GA-72,B-) O059500200005 (30-ZN-72,B-) It is Parent of Ga-72. O059500200006 DETECTOR (SCIN) A Well-Type Gamma Scintillation Counter. O059500200007 DECAY-DATA (31-GA-72,14.1HR) O059500200008 (30-ZN-72,46.5HR) O059500200009 COMMENT - By Authors: the Half-Life has Been Measured by the O059500200010 Authors with Accuracy +/- 0.1 Hour. O059500200011 -By Authors: Briefly,Gallium and Zinc Carriers were O059500200012 Added and Gallium was Separated from Zinc and Most O059500200013 Fission Products by Twice Extracting.The Time of the O059500200014 Second Ether Extraction was Used As the Time of O059500200015 Separation of Ga-72 from Zn-72.Gallium was Further O059500200016 Purified by a Number of Scavenging Precipitations and O059500200017 Repeated Extractions.The Two Samples Obtained,Ga-1 and O059500200018 Ga-2 were Made to Equal Volume in Counting Vials and O059500200019 The Activity Determined.Since All Measurements were O059500200020 Relative,Absolute Disintegration Rates did not have to O059500200021 Be Determined. O059500200022 Ga-1 Showed a Very High Proportion of the 4.87-Hour O059500200023 Ga-73.When this was Allowed to Decay,the 14.1-Hour O059500200024 Ga-72 Could be Quate Easily Measured,Although at the O059500200025 Very Lowest Bombardment Energies the Activity of Ga-72 O059500200026 Was Very Low.The Ga-2 Samples Generally Showed a Pure O059500200027 14.1-Hour Decay Curve. O059500200028 ENDBIB 26 0 O059500200029 COMMON 1 3 O059500200030 MASS O059500200031 NO-DIM O059500200032 72. O059500200033 ENDCOMMON 3 0 O059500200034 DATA 2 4 O059500200035 EN DATA O059500200036 MEV NO-DIM O059500200037 36.1 0.021 O059500200038 40.7 0.033 O059500200039 55.5 0.068 O059500200040 82.4 0.132 O059500200041 ENDDATA 6 0 O059500200042 ENDSUBENT 41 0 O059500299999 SUBENT O0595003 20021004 0000O059500300001 BIB 5 13 O059500300002 REACTION ((90-TH-232(P,F)35-BR-82,IND,SIG)/ O059500300003 (90-TH-232(P,F)MASS,,SIG)) O059500300004 COMMENT /by Authors/.35.9-Hour Br-82 is Shielded. O059500300005 After Dissolution of the Target (ICE-COOLED),Bromine O059500300006 Was Separated About 4-Hours After Bombardment.This O059500300007 Allowed Complete Decay of Se-83 to Br-83. O059500300008 The Bromine Samples Showed Only the 35.9-Hour Br-82 andO059500300009 2.4-Hour Br-83 (AN INTERNAL MONITOR FOR BR-82) O059500300010 Activities,with 1.9-Hour Kr-83-M Contributing in Some O059500300011 Samples. O059500300012 RAD-DET (35-BR-82-G,B-) O059500300013 DECAY-DATA (35-BR-82-G,35.9HR) O059500300014 DETECTOR (PROPC) A 4-Pi Beta-Counter. O059500300015 ENDBIB 13 0 O059500300016 COMMON 1 3 O059500300017 MASS O059500300018 NO-DIM O059500300019 82. O059500300020 ENDCOMMON 3 0 O059500300021 DATA 2 6 O059500300022 EN DATA O059500300023 MEV NO-DIM O059500300024 12.8 0.0043 O059500300025 18.6 0.0067 O059500300026 39.5 0.035 O059500300027 55.5 0.062 O059500300028 82.4 0.109 O059500300029 82.4 0.125 O059500300030 ENDDATA 8 0 O059500300031 ENDSUBENT 30 0 O059500399999 SUBENT O0595004 20021004 0000O059500400001 BIB 5 9 O059500400002 REACTION ((90-TH-232(P,F)47-AG-112,IND,SIG)/ O059500400003 (90-TH-232(P,F)MASS,,SIG)) O059500400004 COMMENT /by Authors/.In the Silver Samples Which were Measured O059500400005 On the Gamma Spectrometer,Only the 3.2-Hour Ag-112 was O059500400006 Observed,with a Trace of a Long-Lived Tail in the Ag-1 O059500400007 Samples,Presumably the 270-Day Ag-110-M. O059500400008 RAD-DET (47-AG-112,DG) O059500400009 DECAY-DATA (47-AG-112,3.2HR,DG,1300.) O059500400010 DETECTOR (NAICR) A 3-In.*3-In. NaI(Tl) Crystal. O059500400011 ENDBIB 9 0 O059500400012 COMMON 1 3 O059500400013 MASS O059500400014 NO-DIM O059500400015 112. O059500400016 ENDCOMMON 3 0 O059500400017 DATA 2 6 O059500400018 EN DATA O059500400019 MEV NO-DIM O059500400020 17.2 0.018 O059500400021 25.8 0.035 O059500400022 40.7 0.058 O059500400023 55.5 0.077 O059500400024 82.4 0.154 O059500400025 82.4 0.158 O059500400026 ENDDATA 8 0 O059500400027 ENDSUBENT 26 0 O059500499999 SUBENT O0595005 20021004 0000O059500500001 BIB 5 9 O059500500002 REACTION ((90-TH-232(P,F)57-LA-140,IND,SIG)/ O059500500003 (90-TH-232(P,F)MASS,,SIG)) O059500500004 COMMENT /by Authors/.The Lanthanum Samples Showed a Decay of O059500500005 40.2-Hour,the Half-Life of La-140,with the La-1 O059500500006 Samples Containing Less Than 1% of Longer-Lived O059500500007 Activities. O059500500008 RAD-DET (57-LA-140,DG) O059500500009 DECAY-DATA (57-LA-140,40.2HR,DG,1600.) O059500500010 DETECTOR (NAICR) A 3-In.*3-In. NaI(Tl) Crystal. O059500500011 ENDBIB 9 0 O059500500012 COMMON 1 3 O059500500013 MASS O059500500014 NO-DIM O059500500015 140. O059500500016 ENDCOMMON 3 0 O059500500017 DATA 2 3 O059500500018 EN DATA O059500500019 MEV NO-DIM O059500500020 25.8 0.043 O059500500021 55.5 0.22 O059500500022 82.4 0.22 O059500500023 ENDDATA 5 0 O059500500024 ENDSUBENT 23 0 O059500599999 ENDENTRY 5 0 O059599999999