Numerical Study of Long-Term Radioactivity Impact on Foodstuff for Accidental Release Using Atmospheric Dispersion Model

The radiological consequences of a potential atmospheric release of 131 I, 137 Cs, 133 Xe and 90 Sr for hypothetical accident appropriate to a 10 MW research reactor were calculated. The Gaussian model CROM (Screening Model for Environmental Assessment) was used to compute the accidental radioactive release under emergency exposure situation and the estimation of yearly average dose by different exposure pathways. The realistic assessment of radiation level due to the abnormal occurrence operation of nuclear installations such as foods consumption, external irradiation, inhalation and ingestion has been examined. In this study, the evaluation of the dose results, to a continuous emissions rate under dry and wet deposition process, was estimated onto six reference groups of public covering the period from the new born infant to more than 17 years old as defined by the International Commission on Radiological Protection. The obtained modeling results were compared to the limits values prescribed by IAEA and Euratom recommendations. The findings indicate that the ground concentrations were found to be significant and mostly sensitive to the emission conditions, when the total deposition exceeds the contamination limits. The short-lived isotopes have much more influence on the concentration on foodstuff. The activity concentration of 131 I is significantly higher in animal products and vegetables, while the 137 Cs is dominant in fruits vegetables. In contrast, the Noble gas 133 Xe is significantly lower.