PERKIRAAN DOSIS RADIASI YANG DITERIMA PUBLIK DI PROVINSI KEPULAUAN BANGKA BELITUNG

Bangka and Belitung Islands is known to have the geological potential of mineral resources, especially tin along with its accessory minerals which are distributed in almost all land and sea regions. Besides tin, tin mining activities in Bangka Belitung produces a by-product containing radioactive substances which have a risk as one of factor that can affect on the health of publics members. A major contribution of the radiation dose to the publics health comes from natural radionuclides of 226Ra, 232Th and 40K in accessory minerals of tin core. The aim of this study was to estimate the total annual radiation dose received by the
cmembers of the public in Bangka-Belitung through external and internal exposure. Estimation of external dose was based on the concentration of 226Ra, 232Th and 40K in the soil and gamma exposure rate direct measurement in public houses. While the internal dose was estimated based on intake of 226Ra, 232Th and 40K by ingestion of foodstuffs that were consummed by public of Bangka - Belitung (vegetables, seeds, tubers, fruits, fishes and drinking water). Internal dose also estimated from the inhalation of radon (222Rn) and thoron (220Rn) inside the house. The annual effective external doses of outdoor and indoor ranged between 0,05 to 11,55 mSv (mean=1,17 mSv) and 0,15 to 2,10 mSv (mean=0,69 mSv) per year respectively. The annual effective internal doses by ingestion of foodstuffs and drinking water and inhalation of radon and thoron gases were 0.20 mSv, 0,76 mSv and 2,32 respectively. So that the total annual effective doses received by the member of the public in Bangka-Belitung through external and internal exposure was 5.14 mSv. In conclusion, the members of the public in Bangka – Belitung islands received higher dose of radiation than the worldwide average value for normal areas.