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Abstract
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Article Information:
Efficiency curves of the Ghana Research Reactor-1(GHARR-1) Spectrometry System at Near and Far Geometries
S.E. Agbemava, E. Alhassan, R. Della, I.K. Baidoo, N.A. Adoo, V.Y. Agbodemegbe, C.Y. Bansah and G.I. Appiah
Corresponding Author: Sylvester Ebo Agbemava
Submitted: 2011 February, 03
Accepted: 2011 March, 08
Published: 2011 April, 20 |
Abstract:
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The efficiency curves of the HPGe detector at different geometries were measured in a wide energy
range of 53.16 to 1408 keV. In this study emphasis was laid on the effects of the source energy and the sourceto-
detector distance. Due to the variation of the activity levels of various samples in gamma-ray spectroscopy,
the source-to-detector distance is not fixed at a constant value. This means that the measurements of the
absolute detector efficiency must be carried out for each geometrical arrangement used in gamma-ray
measurements. The full energy peak efficiency in terms of the gamma-ray energy and the vertical distance from
the detector surface has been obtained for an N-type high purity germanium (HPGe) detector using point-like
calibrated sources at four different distances from the detector. Comparison of the calculated and the
experimentally measured efficiency values for the energy range of 26.345-1408 keV and a source to detector
distances of 36, 49, 62, and 75 mm showed that the calculated values agree with that of the experiment within
the limits of uncertainty. The standard deviations of the calculated efficiency values from the experimental at
the respective source-to-detector height were as follows: 0.05% for 36 mm, 0.08% for 49 mm, 0.03% for 62
mm and 0.01% for 75 mm.
Key words: Detector, energy peak, gamma-ray, germanium, HPGe, spectroscopy,
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Cite this Reference:
S.E. Agbemava, E. Alhassan, R. Della, I.K. Baidoo, N.A. Adoo, V.Y. Agbodemegbe, C.Y. Bansah and G.I. Appiah, . Efficiency curves of the Ghana Research Reactor-1(GHARR-1) Spectrometry System at Near and Far Geometries. Research Journal of Applied Sciences, Engineering and Technology, (04): 272-277.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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