Environmental radon studies using solid state nuclear track detectors

摘要

The results of radon activity recorded in 70 dwellings of Nurpur area, Kangra district, Himachal Pradesh, India are reported. LR-115 Type 2 films in the bare mode were exposed for four seasons of three months each covering a period of one year for the measurement of indoor radon levels. The calibration constant of 0.020 tracks cm~(-2) d~(-1) per Bq m~(-3) has been used to express radon activity in Bq m~(-3). The annual average indoor radon concentrations in 17 different villages of the area are found to vary from 168 ± 46 to 429 ± 71 Bq m~(-3). Most of the indoor radon values lie in the range of action levels (200-600 Bq m~(-3)) recommended by International Commission on Radiological Protection.