Pages: 253-260

Authors: Rasha Ali El-Tayebany, Mohamed Helmy Hazzaa, Sameh Elsayed Shaban, and Hekmat Mohammed El Begawy

Abstract

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 fast and reliable method was applied in detector efficiency measurements. The data are discussed and interpreted.

Key words: HPGe detector, digital signal processing, gamma-ray, resolution non-destructive assay technique

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