ASSESSMENT OF NATURAL RADIATION DOSE RATES IN AND AROUND UKHRUL TOWN OF MANIPUR, INDIA

The natural background gamma radiation levels were measured in the dwellings of Ukhrul district of Manipur, India using Micro-R survey meter.The measured minimum, maximum and average radiation levels for outdoors were found to be 5.50 ± 0.58, 10.00 ± 0.84 and 7.13 ± 0.77 µR/hrrespectively. Whereas, the measured minimum, maximum and average radiation level for indoors were 5.80 ± 0.84 (Stone wall house with mud floor), 12.20 ± 0.84 (RCC building) and 9.40 ± 0.87 µR/hr respectively. The annual effective dose to the individuals due to the exposure of the natural background gamma radiation levels for Ukhrul district of Manipur based on the present study is estimated to be 0.78 ± 0.08 µGy/yea