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PGAA facility is being installed at the upside of
exit of ST1 irradiation hole in HANARO. For the extraction
of thermal neutrons, pyrolytic graphite(PG) crystals
for the diffraction of neutron beam are used and beam
collimator for the absorption of thermal neutron, gamma-ray
and fast neutron consists of borated plastic, lead and
polyethylene. The beam size passed through the collimator
at sample position is 20 x 20 mm2
Detecting system arrayed as annulus type with
8 BGO detectors surrounding around HPGe detector is
designed to suppress background by Compton scattering
and to enhance analytical sensitivity. Main detector
is n-type HPGe which have specification such as beryllium
windows of 0.5 mm thick, 43% relative efficiency and
2.2 keV resolution at 1332 keV of 60Co.
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Irradiation Hole
ㆍST1
horizontal port
ㆍInitial thermal neutron
flux : > 8×109
n·cm-2·s-1
ㆍTechnology for thermal neutron extraction
- Diffraction method using pyrolytic
graphite crystal |
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PGAA Assembly
ㆍUse : Measurement and analysis
of prompt gamma-rays
for
elemental analysis
ㆍComposition : HPGe detector
(43%
relative efficiency)
Annulus structure (HPGe+8 BGO),
Sample changer, beam shutter
ㆍMeasauring mode : Single,
Pair,Compton suppression
ㆍMeasuring range : 80 keV - 11 MeV |
Main Specification at Sample
Position
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