Estimation of background radiation levels and associated health risks in mineral rich district Chiniot, Pakistan

The mineral extraction activities may disturb the natural radioactivity, therefore current study aims to generate baseline data of natural radionuclides and anthropogenic ¹³⁷Cs before the start of industrial activities. Gamma spectrometry and gross alpha and beta counting systems were used for activity measurement in environmental samples. In soil, the mean activity of ²³²Th, ²²⁶Ra, ⁴⁰K and ¹³⁷Cs were determined as 79 (66-117), 47 (34-80), 823 (602-1159) and 1.3 (1.1-4.5) Bq kg^-1, respectively. The average annual effective dose rate (128.7 µSv h^-1) in the study area was twice higher than world's average value. Indoor hazard index was greater than unity at two places; therefore, proper ventilation is proposed during construction. (author)