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