investigation of annual effective dose and risk assessment by gamma dose rate in areas of chhattisgarh at durg balod and bemetara districts

Abstract

newline Human beings are exposed to natural radiation that is present outside and inside newlinehouses. In India, the Bhabha Atomic Research Centre is working in this field. To newlinemonitor natural radiation towards mankind, BARC allotted projects zone wise and newlineupto Districts grid map towards different scientific and educational organisations. In newlineearlier studies at Chhattisgarh, very few work reported the radionuclides and radon newlinelevels from a few places of Chhattisgarh. However, no detailed study of the gamma newlinedose rate is available for the districts of Chhattisgarh, especially for the Durg, Balod newlineand Bemetara district areas. Hence, the present study aims to measure the gamma dose newlineradiation rate from indoors and outdoors of three major districts of Chhattisgarh and newlinecalculate the annual effective dose values to set the baseline data for the study areas. newlineThe objective of the study is also to estimate the cancer risk from gamma radiation for newlinethe Durg, Balod and Bemetara districts. This investigation involved the study of the newlineimpact of season on the outdoor gamma dose radiation and the impact of newlinemeteorological parameters. newlineIndoor and outdoor gamma radiation dose rates are determined by using the Polimaster newlinePM-1405 device, which is based on the Geiger-Muller technique. This device newlinedetermined both terrestrial and cosmic radiation. Altitude values of areas are used for newlinedetermination of cosmic radiation. Terrestrial radiation determined by subtracting the newlinecosmic rays from measured values of gamma dose rate. Total 154 grid map (6×6 km2) newlinepopulated areas of the Balod, Durg and Bemetara districts were selected for the newlinemeasurement of indoor and outdoor gamma dose radiation rates. The latitude (N) and newlinelongitude (E) of all study locations are determined by using the GPS coordination newlinedevice model GARMIN OREGON 650. Annual effective dose values are calculated newlinefrom measured values of OGDR and IGDR, and then LED values are calculated for newlineinfants, children and adults. Cancer risk was calculated for those areas where the newlinelifetime effective d