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

Journal Article · Fri Jan 22 04:00:00 EST 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4940074· OSTI ID:22494529

Wagiran, H. ^[1]; Ibrahim, N. ^[2]; Hamzah, S.; Elias, M. S. ^[3]; Siong, W. B. ^[4]

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1. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai,Johor (Malaysia)
2. Faculty of Defence Science and Technology, National Defence University of Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur (Malaysia)
3. Malaysia Nuclear Agency (MNA), Bangi, 43000 Kajang, Selangor D.E. (Malaysia)
4. Chemistry Department, Faculty of Resource Science & Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak (Malaysia)

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 {sup 57}Co, {sup 60}Co, {sup 133}Ba and {sup 137}Cs 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.

• OSTI ID: 22494529
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1704; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARIUM 133
CALIBRATION
CESIUM 137
COBALT 57
COBALT 60
COMPUTER CODES
CORRECTIONS
DIAGRAMS
DISTANCE
HIGH-PURITY GE DETECTORS
NEUTRON ACTIVATION ANALYSIS
POINT SOURCES
SIMULATION