Volume 4, Issue 1

Study on Natural Gamma Radiation Hazards in and around Hassan District, Karnataka State, India.

Author

E. Srinivasa 1, Rangaswamy D. R.2 and J. Sannappa2*

Abstract

The natural background gamma radiation levels were measured in dwellings
of urban Hassan city & its surrounding Taluks, Karnataka state, using
environmental radiation Dosimeter ER-709. The recorded gamma dose rate
in indoor atmosphere was found to vary from 87 nGy.h-1to 487 nGy.h-1 with
a mean value of 288.6±102 nGy.h-1. In outdoor atmosphere it was found to
vary from 78.3 nGy.h-1to 461nGy.h-1 with an average value of 260.4±88
nGy.h-1. It was observed that the dose rates are higher in Channarayapatna
Taluk and in Hassan City and lower in the place of Halebeedu and Belur.
The absorbed dose at different mines and granite factories were found to
vary from 304.5 nGy.h-1to 583 nGy.h-1with an average value of 434.6
nGy.h-1. The Annual effective dose due to natural background gamma
radiation exposure in the Hassan city and its surrounding Taluks is
calculated and found to be 0.67 mSv.y-1 & 2.90 mSv.y-1with mean value of
1.735±0.56 mSv.y-1. This is higher than the global average.

DOI

https://doi.org/10.62226/ijarst20150100

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