Evaluation of Natural Radioactivity Level in Environment near a Urarium Mine

A survey of natural radioactivity level in environment near the urarium mine in Shanxi province were conducted.The absorbed dose rate from γ radiation in the area was measurmented.The contents of radionuclindes in the sources of drinking water and river,soil and vegetable samples were determined.The radon concentrations in indoor and outdoor air were aslo determined. The results indicated that the natural radioactivity levels in the area were hihger than those of the average levels in the provicial and nationwide,but the majority of the area was within the range of normal natrual background radiation level.The radon concentration was very high in the workshop in grotton and it should be taken measures to reduce the harm of radon and its decay products of the workers.