Characteristic absolute efficiency response curves of a high purity germanium detector in the energy range 50–1500 keV

M. Rajput; Mahmud Ahmad; Waqar Ahmad

doi:10.1023/a:1014842511144

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 251: Issue 3

Characteristic absolute efficiency response curves of a high purity germanium detector in the energy range 50–1500 keV

Authors:

M. Rajput

M. Rajput PINSTECH P.O. Nilore Nuclear Physics Division Islamabad Pakistan

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Mahmud Ahmad

Mahmud Ahmad PINSTECH P.O. Nilore Nuclear Physics Division Islamabad Pakistan

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Waqar Ahmad

Waqar Ahmad PINSTECH P.O. Nilore Nuclear Physics Division Islamabad Pakistan

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Pages:: 457–462

Online Publication Date:: 01 Nov 2004

Publication Date:: 17 Mar 2002

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1014842511144

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Abstract

The characteristic absolute efficiency response curves of a high purity germanium detector (HPGe) for different counting geometries have been established in the energy range 50–1500 keV by measuring the absolute efficiencies using both mono-energetic and multi-gamma emitting radionuclide point calibrated sources supplied by IAEA. Several fitting functions proposed in the literature were assessed for interpolation within the intermediate energy range of interest. The values of the function parameters have been determined by using the linear least square methods. The problems associated with the measurements of experimental efficiency data at small source–detector distances and the importance of the correlation matrix in the estimation of precise uncertainties have been shown. It was found that the inclusion of correlation matrices in the propagation of error formulae plays a significant role up to 450 keV gamma-ray energy and results in a drastic reduction of errors associated with the predicted efficiencies. The discrepancy at closer counting geometries in the absence of true gamma-gamma coincidence corrections is found to reach to about 30%.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)