Concentrations of Naturally Occuring Radionuclides and Fission Products in Brick Samples Fabricated and Used in and Around Greater Dhaka City

Abstract

The radioactivity concentration of ²²⁶Ra, ²³²Th and ⁴⁰K were measured by using gamma ray spectroscopy in different types of brick samples (bangla, ceramic and picket) fabricated and used in the urban areas of Dhaka city and its suburbs. A knowledge of gamma radioactivity is necessary to adopt preventive measures to minimise the harmful effects of ionising radiation. The radium equivalent activity concentrations, external and internal hazard indices (Hext and Hint) in these brick samples were determined and were found to be comparable with those of other countries.