Objectives In order to determine the atmospheric diffusion coefficient (χ/Q) and assess the radiation dosage resulting from a hypothetical release of iodine-131 under stable atmospheric conditions (stability class E), this study will model the atmospheric diffusion of radioactive contaminants using the MACCS2 tool. Material and Methods The MACCS2 code was used to perform atmospheric diffusion simulations under atmospheric stability class E, examining how wind speed and distance from the emission point affected the relative air concentration. The diffusion coefficient (χ/Q) reached its maximum value of 3.67E−03 s/m 3 at a wind speed of 0.5 m/s and a distance of 100 m. This value was entered into the Total Effective Dose Equivalent (TEDE) calculation. Four age groups were included in the study: adults who worked outside, adults who worked indoors or retired, children (10 years old), and (1 year old). Results The maximal effective dose (TEDE) of I-131 was found to be 9.38 E−07 TEDE for adults outside, 8.26 E−07 TEDE for adults indoors, 5.68 E−07 TEDE for children (10 years old), and 1.93 E−07 TEDE for newborns (1 year old) in stability class E at a wind speed of 0.5 m/s and a distance of 100 m. It was also demonstrated that as wind speed and distance increased, the concentration and dose levels decreased. The International Atomic Energy Agency’s recommended yearly occupational exposure limit of 2 E−02 TEDE was far below all computed values. Conclusion The results indicate that the hypothetical scenario for stable atmospheric condition (E) does not result in doses that are higher than those that are internationally permitted limits. The study underscores the importance of using the MACCS2 code in assessing radiological consequences and supporting control and safety decisions at nuclear facilities.
Ahmed et al. (Tue,) studied this question.
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