Study the effect of natural background for gamma spectrometer system

Abstract

In the analysis of environmental radioactive isotopes using gamma spectrometry, natural background radiation is an important parameter related to the analytical results directly. Therefore, in this work, the influence of natural background radiation was studied for two models: with and without shielding of gamma spectrometer system. The initial results showed that the minimum detectable activity (MDA) of radionuclides such as ²³⁴Th, ²²⁶Ra, ²¹²Pb, ²⁰⁸Tl, ⁴⁰K, ²¹⁴Pb, ²¹⁴Bi, ²²⁸Ac have the difference of two models from 10% to 503%. This is the basis for researches to improve the lead shielding chamber in the future.