Gamma Activity in the Bricks Used for the Construction of Dwellings in Rawalpindi and Islamabad Areas of Pakistan

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Abstract
Gamma activities of brick samples from 26 kiln sites around Islamabad and Rawalpindi (Pakistan) have been determined using gamma ray spectrometry. The average values of the measured activities are 43.3 ± 6.0, 52.2 ± 6.0, and 631.3 ± 82.7 Bq.kg-1 for 226Ra, 232Th and 40K respectively. The estimated radium equivalent concentration is 168.6 ± 17.8 Bq.kg-1. This value is comparable with the reported values for many countries in the world. The internal and external hazard indices vary from 0l.4 to 0.68 and 0.32 to 0.53 respectively. These bricks are therefore not a major source of radiation hazard.

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