Assessment Of Dose From External Exposure To A Plume Of Radioactive Material Using Mathematical Models

Egypt is one of the growing lists of countries turning to nuclear energy to provide a dependable source of power. The public should be protected from the radiological hazards due to normal operation and accidental releases .This study focus on assessment of the dose due to routinely dispersion of gaseous radioactive plume from NPP in Inshas site, Egypt, which was calculated by using different models and WRPLOT computer code was used for determination of the wind rose. The analysis of the results showed that the value of the effective dose received by critical public (considering occupation factor 100% and the source of release is ground) due to immersion in radioactive gases plume was higher than the effective dose deposition of radioactive material on the ground surface for downwind sector. The results of the effective dose due to these pathways for different organs are: gonad (6.84E-1 µSv/y and 3.21E-7 µSv/y), breast (8.33E-1 µSv/y and 3.42E-7 µSv/y), lung (5.61E-1 µSv/y and 2.66E-7 µSv/y) and thyroid (6.42E-1 µSv/y and 2.56E-7 µSv/y). The results also show that annual effective dose received by critical group living next to NPP from different releases was less than the reference value for any organ according to ICRP (2007) and ICRP (1990). These results are very useful for the decision maker