Abstract
ABSTRACT The present investigation involved the collection of various construction materials from several sites throughout the Mangalore District, Karnataka, India. The concentration of radionuclides in each sample was then determined using a NaI(Tl) detector. The passive ‘Can’ technique method was used to determine the rate of radon exhalation in the collected samples. The activity concentration of 40K ranges from 36.53 Bq kg−1 to 80.68 Bq kg−1. The activity concentration of 226Ra ranges from 23.30 Bq kg−1 to 80.87 Bq kg−1. The 232Th activity concentration found to be lowest is 15.06 Bq kg−1 and a maximum of 38.65 Bq kg−1 in different samples. The estimated Activity Utilisation index (AUI), dose rate (D) and gamma index (Iγ) which is lower than the recommended limit. The hazard index values are below the Indian, World average and below the safety limit, which indicates that construction materials are safe to use for construction purposes. The present investigation gives insight on radiation hazards to the human population used in the selected location.
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