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2 Acta Geophysica

2 2018

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Dose assessment from the exposure to attached and unattached progeny of radon and thoron in indoor environment

Prasad M., Bossew P., Kumar G. A., Mishra R., Ramola R. C.

Acta Geophysica

2018

Vol. 66, no. 5

1187--1194

The radiation dose from the exposure to radon (222Rn) and thoron (220Rn) is mainly contributed by their progeny, not by the gases themselves. This study aims to investigate the health risk associated with the internal exposure to attached and unattached progeny of 222Rn and220Rn in the indoor environment of Garhwal Himalaya, India. For this purpose, the passive measurements of attached and unattached progeny levels of 222Rn and 220Rn were performed in Garhwal Himalaya, India using nuclear track detector based recently developed progeny sensors. The measured values of unattached and total progeny concentrations were used to estimate the unattached fractions and annual effective doses. The annual mean unattached fractions of 222Rn and 220Rn progeny were found to be 0.15 ± 0.04 and 0.17 ± 0.05, respectively. The estimated values of the annual effective doses were found to be 3.4 ± 1.9 mSv/y and 0.7 ± 0.4 mSv/y due to the progeny of 222Rn and 220Rn, respectively. The methodology and results obtained are discussed in details.

A comprehensive study of radon levels and associated radiation doses in Himalayan groundwater

Prasad M., Kumar G. A., Sahoo B. K., Ramola R. C.

Acta Geophysica

2018

Vol. 66, no. 5

1223--1231

The concentration of radon in groundwater is mainly governed by the radium content in the rocks of the aquifer. The internal exposure to high levels of radon in water is directly associated with the radiological risk to members of public. In this work, radon concentrations were measured in groundwater of Garhwal Himalaya, India, using scintillation detector-based RnDuo and silicon detector-based RAD7 monitors. An inter-comparison exercise was carried out between RnDuo and RAD7 techniques for a few samples to validate the results. The radiation doses associated with the exposure to radon in water were estimated from measured values of activity concentrations. An attempt has been made to see the effect of geology, geohydrology and different types of sources on radon levels in Himalayan groundwater. The experimental techniques and results obtained are discussed in detail.