Test performance of Gamma Spectrometry Co-Axial High Purity Germanium detectors in Universiti Teknologi Malaysia. (original) (raw)

2019, IOSR Journals

The utilization and prolonged working of two gamma spectrometry (GS1 and GS2) in nuclear laboratories, UTM, causing one to questioning its performance. To achievethe higher quality outcomes of gamma spectrometry system. Itsperformance specifications should verify against the warranted values offered by the manufacturer. High purity germanium (HPGe) detectors is the most distinguished radiation measurement instrument that produced excellent energy resolution. The aims of this studyis to determine the working condition and compare the performances of two gamma spectrometry systems. The GS1 consist of n-type closed end coaxial HPGe detector GC 2018 model and GS2 consist of p-type closed end coaxial HPGe detector of GEM25-76-LB-C model. The test performance specifications such as resolution, peak shapes, peak-to-Compton ratio, figure of merit, and dead time for both spectrometry systems are measured using American ANSI/IEEE 325-1996 standard procedure.Four (4) standard source 60 Co, 152 Eu, 133 Ba, and 137 Cs were used. It covered energies range from (4.3 keV-3194.9) keV. The source-to-detector distance is set 25 cm to avoid the summing coincident gamma ray. The relative efficiency measured improve by 0.2% and 4% for GS1 and GS2 respectively. Peak-to-Compton ratio of both detectors improved by factor of 4.Dead time found to be less than 1% at 25 cm compared to 12 cm. From the results, GS1 has higher resolution compared to GS2 detector. Based on the results obtained, it can be concluded that the performance of two coaxial HPGe detectors in nuclear laboratories, (UTM) are in good working condition.Thisrevealed propercontrol and maintenance of the two detectors.

Optimization of HPGe detector response using fast and reliable method

Nuclear Technology and Radiation Protection, 2020

Safeguards system with high effectiveness and efficiency must comprise a set of measurements with capabilities satisfactory for the verification of nuclear materials. In this paper, we present key parameter measurements of detector modeling in a commercial n-type low energy germanium detector of a planar crystal with a relative efficiency of nearly 15 %. The detector optimization will hold a significant function in measuring nuclear materials for safeguards application. Standard nuclear materials with diverse enrichment (depleted and low enriched) of uranium and point-like sources (137Cs, 60Co) and mixed radioactive source for Eu isotopes (152Eu, 154Eu, and 155Eu) were benefited to explore the energy resolution and detector efficiency. The energy resolution is measured over a wide range of rise time and flattop. In addition to the experimental work, the Monte Carlo simulation code is used for modeling the setup configuration to obtain the absolute efficiency at different energies. A...

Determination of full energy peak efficiency of HpGe detector from 59.5 to 1332.5 keV

Indian Journal of Pure & Applied Physics, 2006

To detect very low radio activities in the environmental samples, it is sometimes necessary to know the full energy peak efficiency of the detector. This work proposes a full energy peak efficiency simulation which represents adequately the high purity germanium coaxial detector responses in the energy range 59.5-1332.5 keV and at distances of 5, 10 and 25 cm.

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