ENTRY O1725 20110125
SUBENT C O1725001 20110125
BIB 11 55
TITLE On the photon self-absorption correction for thin-
target-yields vs. thick-target-yields in radionuclide
production.
AUTHOR (Z.B.Alfassi, E.Persico, F.Groppi, M.L.Bonardi)
REFERENCE (J,ARI,67,240,2009) Digitizing data
(J,ARI,68,1595,2010) Digitizing data
(J,RCA,99,1,2011) Table data
INSTITUTE (3ISLNEG)
(2ITYMIL)
FACILITY (CYCLO,2ZZZISP)
SAMPLE Thick targets W-natural isotopic composition and
several 500 mg of highly enriched 99.9% W-186 powder
and W-180 0.001%, W-182 0.01%, W-183W 0.005%, W-184
0.09% were used.
The powdered targets were pressed up to 15M Pabyan
hydraulic crystallography press in between two
accurately measured high purity Al foils, 10 mm of
nominal diameter, 120 and 200 mm thick. During the
irradiation,the Al-W-186-Al stacks were enveloped
in between other two further calibrated high purity
12 mm Al foils, 99.999%, 20*20 mm**2 area in order to
prevent any losses and contaminations of activated
W-186 powder during and /or after their radiation, i.e.
these sheets ware taken away after their radiation.
The Al foils thickness was chosen in order to obtain
values of the energies incident on the enriched W-186
targets comparable for protons (13.6+-0.2 MeV) and
deuterons(13.4+-0.2 MeV) beams.
DETECTOR (HPGE) 8 HPGe detectors, 15-40% relative efficiency,
1.9-2.3 keV FWHM for Co-60 and peak to Compton ratio
30:1 at 1.33 MeV
METHOD (SITA)
ERR-ANALYS (ERR-S,,0.1).Statistical error on the net peak counts.
(ERR-1,1.,2.).Error in integrated beam charge.
Typical over all relative type error of 4.5%. The
systematic errors were not taking in to account-
decay half-life, gamma emission intensity, decay
branching.
(ERR-2) calibration 226Ra source uncertainty (1.5%)
(ERR-3) calibration 152Eu source uncertainty (2.0%)
(ERR-4) calibration 133 Ba source uncertainty (3.0%)
(ERR-5,,1.) fitting of the detector efficiency
curves (< 1%),
with a typical overall relative type A error of 4.5%.
** The systematic errors(ISO type B)were not taking
into account, i.e.:
* decay half-life,
* gamma emission intensity,
* decay branching
(DATA-ERR).The error is reported by authors.
(EN-ERR).The error is reported by authors.
STATUS (TABLE).Table 4,6 of J,RCA,99,1,2011
HISTORY (20090409C) SB
(20110125A) Digitizing data were replace by table
of J,RCA,99,1,2011. New reference were added.
ENDBIB 55 0
COMMON 4 3
ERR-2 ERR-3 ERR-4 EN-ERR
PER-CENT PER-CENT PER-CENT MEV
1.5 2.0 3.0 0.2
ENDCOMMON 3 0
ENDSUBENT 62 0
------------------------------------------------------------------------
SUBENT O1725003 20110125
BIB 3 6
REACTION (74-W-186(P,N)75-RE-186-G,,TTY,,PHY)
STATUS (TABLE).Table 6 and value in text at 15.29 MeV
of J,RCA,99,1,2011
COMMENT *By author*.Thick target yields of Re-186-g corrected
for 137 keV photon absorption and isotopic abundance
of W-186(28.43%)
ENDBIB 6 0
NOCOMMON 0 0
DATA 3 2
EN DATA DATA-ERR
MEV MBQ/COUL MBQ/COUL
13.6 746. 31.
15.29 843. 42.
ENDDATA 4 0
ENDSUBENT 15 0