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Measurement of indoor radon, thoron and their equilibrium equivalent concentrations in different dwellings around Kabini river basin, Karnataka State, India was carried out using SSNTD based pin-hole dosimeters during 2017–2018. Indoor concentrations of radon and thoron are varied from 18.9 to 156.8 Bq m− 3 and 13.1 to 110.0 Bq m− 3, respectively. The present study reveals that the annual effective dose received by the people of the study area is lesser than the recommended level 3–10 mSv y− 1 of the International Commission of Radiological Protection and is safe from the exposure of radon, thoron and their progenies. [ABSTRACT FROM AUTHOR]

The activity concentration and total annual effective dose of the terrestrial naturally occurring radionuclides (232Th, 226Ra and 40K) were measured in soil and rock samples collected from various locations of Hemavathi river basin in Karnataka, using HPGe detector. The results revealed that activity concentration of radionuclides 226Ra, 232Th and 40K in the soil had geometrical mean values of 16.7 ± 0.6, 33.9 ± 1.2 and 359.9 ± 9.2 Bq kg-1, respectively. In rock samples activity concentrations of 226Ra, 232Th and 40K had geometrical mean values of 20.2 ± 0.7, 18.0 ± 0.9 and 276 ± 9.6 Bq kg-1, respectively. The external Hazard index and indoor hazard index were found to be within safety limits prescribed by European commission 1999 report. [ABSTRACT FROM AUTHOR]

The study on natural radioactivity level in the soil plays a significant role in health physics. The present study has been carried out with the aim of estimating activity concentration of radionuclides in soil samples collected at 30 places around Kolar Gold Fields, Kolar district using gamma ray spectrometry. Average values of activity concentration of Ra, Th and K in soil samples of the present study are 27.3 ± 1.8, 63.1 ± 2.5 and 818 ± 6 Bq kg, respectively. The average radium equivalent activity (Ra), absorbed dose rate and annual effective dose have been calculated and compared with the referred safe values. [ABSTRACT FROM AUTHOR]

Concentration of radon and physicochemical parameters present in ground water collected from 65 bore wells of 30 different locations around Kolar Gold Fields, Kolar District, India are estimated by emanometry technique and chemical analysis. Activity of radium present in rock samples of the study area using HPGe detector are presented and discussed in the manuscript. The average radon concentration in the collected water samples are ranged from 3.3 ± 0.8 to 122.9 ± 2.1 Bq l with an average value of 46.9 ± 1.7 Bq l. Average value of activity concentration of radium is found to be 29.1 Bq kg. [ABSTRACT FROM AUTHOR]

Concentrations of radon in drinking water collected from 32 locations of Hemavathi river basin, Karnataka, India have been measured by emanometry method. The radon concentration in water ranged from 2.7 ± 0.1 to 138.5 ± 1.5 Bq l with a geometrical mean of 25.3 ± 1.1 Bq l. The study revealed that about 82.35% of drinking water samples contained radon concentration more than 11.1 Bq l, the limit is fixed by Environmental Protection Agency. Among the different parameters measured, concentration of radon showed weak correlation with chloride and no correlation with alkalinity, pH, nitrate, sulphate, fluoride and total dissolved substance. [ABSTRACT FROM AUTHOR]