Universiti Teknologi Malaysia Institutional Repository

New approach to calculate the true-coincidence effect of HpGe detector

Alnour, I. A. and Wagiran, H. and Ibrahim, N. and Hamzah, S. and Siong, W. B. and Elias, M. S. (2016) New approach to calculate the true-coincidence effect of HpGe detector. In: 6th International Nuclear Science, Technology and Engineering Conference 2015, iNuSTEC 2015, 17-19 Aug 2015, Negeri Sembilan, Malaysia.

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The corrections for true-coincidence effects in HpGe detector are important, especially at low source-to-detector distances. This work established an approach to calculate the true-coincidence effects experimentally for HpGe detectors of type Canberra GC3018 and Ortec GEM25-76-XLB-C, which are in operation at neutron activation analysis lab in Malaysian Nuclear Agency (NM). The correction for true-coincidence effects was performed close to detector at distances 2 and 5 cm using 57Co, 60Co, 133Ba and 137Cs as standard point sources. The correction factors were ranged between 0.93-1.10 at 2 cm and 0.97-1.00 at 5 cm for Canberra HpGe detector; whereas for Ortec HpGe detector ranged between 0.92-1.13 and 0.95-100 at 2 and 5 cm respectively. The change in efficiency calibration curve of the detector at 2 and 5 cm after correction was found to be less than 1%. Moreover, the polynomial parameters functions were simulated through a computer program, MATLAB in order to find an accurate fit to the experimental data points.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:HpGe detector, Neutron activation
Subjects:Q Science > QC Physics
ID Code:73456
Deposited By: Mohd Zulaihi Zainudin
Deposited On:23 Nov 2017 04:17
Last Modified:23 Nov 2017 04:17

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