ENTRY C2147 20171004 C168C214700000001 SUBENT C2147001 20171004 C168C214700100001 BIB 13 77 C214700100002 TITLE Proton irradiation parameters and chemical separation C214700100003 procedure for the bulk production of C214700100004 high-specific-activity 186gRe using WO3 targets C214700100005 AUTHOR (M.E.Fassbender,B.Ballard,E.R.Birnbaum,J.W.Engle, C214700100006 K.D.John,J.R.Maassen,F.M.Nortier,J.W.Lenz,C.S.Cutler, C214700100007 A.R.Ketring,S.S.Jurisson,D.S.Wilbur) C214700100008 INSTITUTE (1USALAS,1USAMIS,1USAWAU) C214700100009 (1USAUSA) John Lenz and Associates, East Lansing, C214700100010 Michigan C214700100011 REFERENCE (J,RCA,101,339,2013) C214700100012 FACILITY (LINAC,1USALAS) Experiment performed at the Los C214700100013 Alamos Isotope Production Facility (LANL-IPF), which C214700100014 uses 100 MeV proton beam, extracted from the main 800 C214700100015 MeV LANSCE proton linear accelerator. C214700100016 SAMPLE Target stack configuration consisting of WO3 target C214700100017 in degrader assembly with cooling water. The stack C214700100018 components are C214700100019 Material Thickness Entry energy Exit energy dE C214700100020 (mm) (MeV) (MeV) (MeV) C214700100021 Inconel 0.64 100.0 97.2 2.8 C214700100022 Cooling water 5.0 97.2 93.4 3.9 C214700100023 Al degrader 12.4 93.4 71.3 22.1 C214700100024 Cooling water 5.0 71.3 66.4 4.9 C214700100025 Al degrader 10.5 66.4 40.3 26.1 C214700100026 Cooling water 5.0 40.3 32.1 8.2 C214700100027 Nb 0.6 32.1 26.3 5.8 C214700100028 WO3 2.5 26.3 9.7 16.6 C214700100029 Nb 1.4 9.7 Stopped 9.7 C214700100030 Water 5.0 n/a n/a n/a C214700100031 The natWO3 powder target, 25.19 g original mass, C214700100032 5.1 cm dia x 2.54 mm thick, encapsulated in Nb shell C214700100033 windows with thicknesses of 0.6 mm front and 1.4 mm C214700100034 back. C214700100035 The tungsten oxide puck was prepared by pressing (forceC214700100036 200 kN or 20.4 t of weight) and sintering (heating in C214700100037 air at 1000deg C) of the powder and then sealing it C214700100038 inside the capsule under vacuum by means of electron C214700100039 beam welding. C214700100040 DETECTOR (HPGE) Ortec Model GMX-35200-S HPGe detector. The C214700100041 detector diameter was 50.0 mm, detector length 53.5 C214700100042 mm, resolution at 1333 keV was 1.99 keV, the relative C214700100043 efficiency at 1333 keV was about 10%. C214700100044 INC-SOURCE Stack target geometry configuration was used to to C214700100045 degrade the beam energy, the roughly Gaussian shaped C214700100046 proton energy distribution at the target is expected C214700100047 to be significantly broadened (up to +-6MeV FWHM). C214700100048 Mean proton energies within a target stack was C214700100049 determined from radioisotope formation ratios, C214700100050 assuming that the excitation function for those C214700100051 isotopes is well known. The beam current was chosen C214700100052 conservatively and had an average of 18.50+-0.02 mu-A. C214700100053 METHOD (ACTIV,CHSEP) WO3 mass was weighed and dissolved in C214700100054 NaOH solution.The filtered Na2WO4 solution was then C214700100055 loaded onto an anion exchange column (Bio-Rad C214700100056 AG 1 x 8, resin bed column of 1.2 cm C214700100057 diameter x 13.3 cm length, pre-equilibrated with NaOH, C214700100058 1 mol dm-3). The isotope 187W was used as a tracer C214700100059 for tungsten throughout the separation experiment. C214700100060 Rhenium isotopes were quantitatively retained, while C214700100061 the Na2WO4 matrix solution eluted. This final product C214700100062 was assayed for W, Ta, Hf and Re concentration via C214700100063 ICP-AES. An aliquot (2.29 g of solution out of 20.0 g C214700100064 total mass) was diluted with HCl (up to a C214700100065 total of 5.0 g, 0.1 mol dm-3) for analyses. C214700100066 Raw instrument results were corrected for dilution C214700100067 and total target mass. Final product activities C214700100068 measured by gamma ray spectroscopy. C214700100069 ERR-ANALYS (DATA-ERR) No information given C214700100070 COMMENT Supplementing the information in the article, the firstC214700100071 author confirmed (in a private communication to N.O., C214700100072 IAEA Nuclear Data Section, 16 June 2015) that the C214700100073 yields given in Table 4 and compiled in this entry, C214700100074 are physical yields. C214700100075 STATUS (TABLE) Data taken from tab. 4 of the reference C214700100076 HISTORY (20150203C) Compiled by S.H. C214700100077 (20171003A) TS+On. Major revisions in 002-007. C214700100078 See also CP-D/933. C214700100079 ENDBIB 77 0 C214700100080 COMMON 2 3 C214700100081 EN-MAX EN-MIN C214700100082 MEV MEV C214700100083 26.3 9.7 C214700100084 ENDCOMMON 3 0 C214700100085 ENDSUBENT 84 0 C214700199999 SUBENT C2147002 20171004 C168C214700200001 BIB 3 5 C214700200002 REACTION (74-W-OXI(P,X)75-RE-181,,TTY,,PHY) C214700200003 DECAY-DATA (75-RE-181,19.9HR,DG,1440.50,0.019, C214700200004 DG,360.70,0.20, C214700200005 DG,365.57,0.56) C214700200006 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700200007 ENDBIB 5 0 C214700200008 NOCOMMON 0 0 C214700200009 DATA 2 1 C214700200010 DATA DATA-ERR C214700200011 MUCI/MUAHR MUCI/MUAHR C214700200012 254.0 13.0 C214700200013 ENDDATA 3 0 C214700200014 ENDSUBENT 13 0 C214700299999 SUBENT C2147003 20171004 C168C214700300001 BIB 3 3 C214700300002 REACTION (74-W-OXI(P,X)75-RE-182-M,,TTY,,PHY) C214700300003 DECAY-DATA (75-RE-182-M,12.7HR,DG,1189.05,0.15) C214700300004 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700300005 ENDBIB 3 0 C214700300006 NOCOMMON 0 0 C214700300007 DATA 2 1 C214700300008 DATA DATA-ERR C214700300009 MUCI/MUAHR MUCI/MUAHR C214700300010 563.0 22.5 C214700300011 ENDDATA 3 0 C214700300012 ENDSUBENT 11 0 C214700399999 SUBENT C2147004 20171004 C168C214700400001 BIB 3 4 C214700400002 REACTION (74-W-OXI(P,X)75-RE-182-G,,TTY,,PHY) C214700400003 DECAY-DATA (75-RE-182-G,64.0HR,DG,1076.30,0.105, C214700400004 DG,1427.37,0.0979) C214700400005 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700400006 ENDBIB 4 0 C214700400007 NOCOMMON 0 0 C214700400008 DATA 2 1 C214700400009 DATA DATA-ERR C214700400010 MUCI/MUAHR MUCI/MUAHR C214700400011 23.2 1.0 C214700400012 ENDDATA 3 0 C214700400013 ENDSUBENT 12 0 C214700499999 SUBENT C2147005 20171004 C168C214700500001 BIB 3 4 C214700500002 REACTION (74-W-OXI(P,X)75-RE-183,,TTY,,PHY) C214700500003 DECAY-DATA (75-RE-183,1680.0HR,DG,162.32,0.233, C214700500004 DG,107.93,0.0217) C214700500005 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700500006 ENDBIB 4 0 C214700500007 NOCOMMON 0 0 C214700500008 DATA 2 1 C214700500009 DATA DATA-ERR C214700500010 MUCI/MUAHR MUCI/MUAHR C214700500011 8.6 0.2 C214700500012 ENDDATA 3 0 C214700500013 ENDSUBENT 12 0 C214700599999 SUBENT C2147006 20171004 C168C214700600001 BIB 3 5 C214700600002 REACTION (74-W-OXI(P,X)75-RE-184-G,M+,TTY,,PHY) C214700600003 DECAY-DATA (75-RE-184-G,912.0HR,DG,792.07,0.375, C214700600004 DG,894.76,0.156, C214700600005 DG,903.28,0.379) C214700600006 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700600007 ENDBIB 5 0 C214700600008 NOCOMMON 0 0 C214700600009 DATA 2 1 C214700600010 DATA DATA-ERR C214700600011 MUCI/MUAHR MUCI/MUAHR C214700600012 2.9 0.1 C214700600013 ENDDATA 3 0 C214700600014 ENDSUBENT 13 0 C214700699999 SUBENT C2147007 20171004 C168C214700700001 BIB 3 3 C214700700002 REACTION (74-W-OXI(P,X)75-RE-186-G,,TTY,,PHY) C214700700003 DECAY-DATA (75-RE-186-G,89.2HR,DG,137.16,0.0942) C214700700004 HISTORY (20171003A) TS+On. REACTION(SF1) revised. C214700700005 ENDBIB 3 0 C214700700006 NOCOMMON 0 0 C214700700007 DATA 2 1 C214700700008 DATA DATA-ERR C214700700009 MUCI/MUAHR MUCI/MUAHR C214700700010 12.2 0.6 C214700700011 ENDDATA 3 0 C214700700012 ENDSUBENT 11 0 C214700799999 ENDENTRY 7 0 C214799999999