ENTRY A0235 20220331 A100A023500000001 SUBENT A0235001 20220331 A100A023500100001 BIB 13 66 A023500100002 TITLE Absolute cross sections for the production of 18F via A023500100003 the 18O(p,n)18F reaction A023500100004 AUTHOR (T.J.Ruth, A.P.Wolf) A023500100005 REFERENCE (J,RCA,26,21,1979) A023500100006 INSTITUTE (1USABNL) A023500100007 FACILITY (VDGT,1USABNL) A023500100008 (CYCLO,1USABNL) A023500100009 METHOD (EXTB,SITA,ACTIV,CHSEP,BCINT) A023500100010 The proton irradiations were performed on the A023500100011 Brookhaven tandem van de Graaff accelerator. Typically A023500100012 the irradiations were for 1.5-3.0 minutes duration A023500100013 and the beam currents were 100-300 nA. The specific A023500100014 details pertaining to the beam energy analysis, the A023500100015 beam focusing and collimator system, and Faraday cup A023500100016 have been reported previously see 'REL-REF'. The A023500100017 defocused proton beam was directed through a 1 cm A023500100018 collimator which had permanent magnets installed to A023500100019 suppress the secondary electrons produced in the A023500100020 collimator. A023500100021 SAMPLE The beam passed through a thin (5.46 mg/cm2, A023500100022 1/4 mil, 6.4 um) Havar foil, a small air path A023500100023 (~ 1.5 mg/cm2) and a Havar target window A023500100024 (6.44 mg/cm2) before entering the target gas. The A023500100025 total charge collected by the Faraday cup for each A023500100026 run was determined with calibrated current A023500100027 integrators. The target gas consisted of 91.7% A023500100028 enriched 18O-2 with a gross composition of 99.8% mole A023500100029 oxygen. The impurities consisted of 4.0% 17O and A023500100030 4.3% 16O in the form of either O-2 or CO-2. The CO-2 A023500100031 and N-2 impurities were less 0.1% each. A023500100032 The target chamber was constructed of Al and had A023500100033 valved filling ports. The cylindrical chamber was A023500100034 2.0 cm deep and 2.5 cm in diameter. Target pressures A023500100035 ranged between 200 and 600 Torr. The targets were A023500100036 loaded by way of a vacuum line equipped with a A023500100037 Barocell differential pressure transducer. A023500100038 A preliminary experiment indicated that less than 0.1% A023500100039 of the total activity remained in the gas phase in the A023500100040 Al targets. This was determined by passing the A023500100041 irradiated 18O2 target gas through a charcoal trap A023500100042 at liquid n2 temperature and counting the activity A023500100043 trapped. In subsequent irradiations the gas was vented A023500100044 and the target opened for removal of the 18F activity. A023500100045 ADD-RES 1.Chemical separation method. A023500100046 2.Saturation yield curve. A023500100047 DETECTOR (NAICR) A023500100048 ANALYSIS (DECAY) The only activities present were the 18-F A023500100049 and 13-N produced from the (p,alpha) reaction on the A023500100050 4.3% 16-O present. A023500100051 ERR-ANALYS (ERR-1) The uncertainty in the disintegration A023500100052 rate, which combines the effect of the counting A023500100053 statistics (1% approximately) and the decay A023500100054 curve analysis (less 3%). A023500100055 (ERR-2,,1.) Beam current integration uncertainty. A023500100056 (ERR-3,,2.) Maximum uncertainty due to effect of any A023500100057 fluctuations in the intensity. A023500100058 (ERR-4,,1.) The upper limit uncertainty in the number A023500100059 of target nuclei. A023500100060 (ERR-5) The error of chemical transfer of 18-F. A023500100061 REL-REF (N,,R.Colle+,J,PR/C,9,1819,1974) Experimental details. A023500100062 HISTORY (19850212C) A023500100063 (19850228A) A023500100064 (20220331A) SD:Updated to new date formats,lower case. A023500100065 Corrections in all Subents. ERR-ANALYS updated. A023500100066 DATA-ERR1->ERR-1; DATA-ERR2->ERR-2; DATA-ERR3->ERR-3; A023500100067 DATA-ERR4 -> ERR-4; DATA-ERR5 -> ERR-5. A023500100068 ENDBIB 66 0 A023500100069 COMMON 3 3 A023500100070 EN-ERR ERR-1 ERR-5 A023500100071 MEV PER-CENT PER-CENT A023500100072 0.1 3. 2. A023500100073 ENDCOMMON 3 0 A023500100074 ENDSUBENT 73 0 A023500199999 SUBENT A0235002 20220331 A100A023500200001 BIB 8 15 A023500200002 REACTION (8-O-18(P,N)9-F-18,,SIG) A023500200003 DECAY-DATA (9-F-18,109.8MIN,AR,511.,2.) A023500200004 FLAG (1.) This datum was determined at the BNL 60-inch A023500200005 cyclotron using the same Faraday cup assembly. A023500200006 ERR-ANALYS (ERR-T) The total uncertainty in the cross sections A023500200007 determined by combining the errors in quadrature. A023500200008 COMMENT /By authors/. The energy of the irradiation was taken A023500200009 as the mid-point in the range of the protons in the A023500200010 target gas. A023500200011 REL-REF (A,C1016001,J.D.Anderson+,J,PR,177,1416,1969) A023500200012 (A,D0095001,J.P.Blaser+,J,HPA,24,465,1951) A023500200013 (D,,J.P.Blaser+,J,HPA,22,598,1949) A023500200014 STATUS (TABLE) Tbl.2 from Radiochim.Acta 26(1979)21 A023500200015 HISTORY (20220331A) SD: SF5=IND and SF9=EXP deleted from A023500200016 REACTION code. A023500200017 ENDBIB 15 0 A023500200018 COMMON 1 3 A023500200019 ERR-T A023500200020 PER-CENT A023500200021 5. A023500200022 ENDCOMMON 3 0 A023500200023 DATA 3 35 A023500200024 EN DATA FLAG A023500200025 MEV MB NO-DIM A023500200026 2.30 47. A023500200027 2.30 34. A023500200028 3.20 24. A023500200029 3.35 89. A023500200030 4.31 298. A023500200031 4.59 208. A023500200032 4.86 171. A023500200033 5.13 697. A023500200034 5.25 571. A023500200035 5.31 617. A023500200036 5.31 580. A023500200037 5.67 410. A023500200038 5.72 188. A023500200039 6.20 381. A023500200040 6.36 199. A023500200041 6.43 367. A023500200042 6.45 356. A023500200043 6.85 245. A023500200044 7.00 162. A023500200045 7.00 156. A023500200046 7.52 224. A023500200047 8.04 174. A023500200048 9.08 114. A023500200049 9.08 112. A023500200050 10.11 147. A023500200051 10.63 133. A023500200052 11.14 116. A023500200053 11.65 162. 1. A023500200054 11.65 158. 1. A023500200055 11.65 134. A023500200056 11.65 111. A023500200057 12.16 103. A023500200058 13.18 89. A023500200059 13.69 43. A023500200060 14.71 41. A023500200061 ENDDATA 37 0 A023500200062 ENDSUBENT 61 0 A023500299999 ENDENTRY 2 0 A023599999999