ASSESSMENT OF AMBIENT GAMMA DOSE RATE IN DIFFERENT LOCATIONS OF CALICUT DISTRICT, KERALA

The Present research deal with assessment of ambient gamma dose rate in the soil of Calicut district has been undertaken to establish a baseline data on the radiation profile of Calicut district. Micro-R Survey Meter (UR 705 - Nucleonix Systems) is primarily designed to measure low level Gamma and X-radiation and it was used to measure terrestrial gamma radiation levels. The ambient gamma radiation level in the Calicut district was ranged from 8µRhr-1 to 16µRhr-1 with an arithmetic mean of 12.7±2.47µRhr-1. The absorbed Dose level was ranged between 69.44 and 138.68 nGy/h with an arithmetic mean of 110.49± 21.52nGy/h. The Annual Effective Dose Equivalent (AEDE) was ranged from 0.60 to 1.20 mSv/y with an arithmetic mean of 0.1352±0.026mSv/y. From the present study it was concluded that the natural radioactivity of ambient gamma dose rate in the soil of Calicut district was find to be less than that the recommended safe levels.