Pages: 353-360

Authors: Mona M. GOUDA

Abstract

In this article, the full energy peak efficiency of NaI detector using non-axial cylindrical sources is calculated by using a new efficient theoretical approach. This approach depends on using the efficiency transfer method and analytical calculations of the average path length of a gamma photon inside the source to the detector system. Measured efficiencies made by using ¹⁵²Eu aqueous radioactive cylindrical sources with volumes 25 ml and 400 ml. Comparing calculated efficiencies to the measured one showed good agreement enabling the validation of this approach.

Key words: full energy peak efficiency, cylindrical source, average path length,
effective solid angle ratio, efficiency transfer method

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