Radiological impacts in the high-level natural radiation exposure area residents in the Ramsar, Iran

Radiological impacts due to external and internal exposure to high natural background radiation areas caused by the ${}^{226}\text{Ra}$, ${}^{232}\text{Th}$, and ${}^{40}\text{K}$ in the soil of Ramsar, Iran, were carried out. Residual Radioactive Material Guidelines code was applied to the calculation of excess cancer risk of residence. This evaluation shows that the excess cancer risk value is the highest in 20 years' and the lowest value in 120 years' during the time. The results obtained from this research will be useful for risk assessment and decision making for public health protection against high-level radiation.