Radiation Adaptive Response Observed in Residents in High Level Natural Area of Ramsar

Abstract

Residents in Ramsar are exposed to levels of natural radiation as high as 60-200 times higher than the average natural dose rate. Radon levels in some regions of Ramsar are up to 3700 Bq-m^-3. To study the adaptive response in residents in high levels of natural radiation areas in Ramsar, the lung cacer patients recorded over the past two years in eight district of Ramsar with different levels of radon were studied. Data from the Ramsar Health Network show that both crude lung cancer rate and adjusted lung cancer rate in one district with the highest recorded levels of external radiation and radon concentration are lower than those of the other seven districts. It may be concluded that lung cancer rate may show a negative correlation with natural radon concentration. To make a solid conclusion more research is needed