Exposure of Dose Rate due to Granites of Bangalore Metropolis Area, India

Abstract

Introduction: The majority of total radiation dose received by the world's population comes from natural radiation. The distinguishing features of this radiation include relatively persistent exposure to a population at a specific place. Inhalation of 222Rn (radon), 220Rn (thoron), and their offspring contributes the majority of the dose from natural radiation in background regions that are typically present. In light of this, a measurement of dose rate exposure due to some granite floorings has been attempted in Bangalore Metropolis, Karnataka, India. For a period of three years, fifteen distinct granite samples that were used as flooring for construction in buildings were examined.
 Objectives: Measurement of exposure of dose rate due to building construction materials by the inhabitants of Bangalore city
 Methods: Solid state nuclear track detector based dosimeters, CAN techniques and radiation survey meters were used and all the experimental observations were made as per the standard protocols provided by the Bhabha atomic research centre, Mumbai, India were followed.
 Results: The arithmetic mean values of dose rate varied between 2.09 ± 0.10 and 1.39 ± 0.06 mSvy-1. The observed dose rates were found to be higher in granite and lower in coarse-grained dolerite.
 Conclusions: All 14 types of granite samples have undergone a minimum of 30 measurements. The greater activity concentration of radionuclides found in granite samples leads to higher dose rates.