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Year : 2016  |  Volume : 39  |  Issue : 4  |  Page : 177-182

A methodology for evaluation of absorbed gamma dose-rate factors for radionuclides distribution in soil

Department of Nuclear Law, Egyptian Nuclear and Radiological Authority, Cairo, Egypt

Correspondence Address:
Kh A Allam
Egyptian Nuclear and Radiological Regulatory Authority, 3 Ahmed El Zommer, Nassr City, Cairo
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.199975

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After Fukushima accident, new approaches are found to be needed for the simulation of the absorbed dose-rate calculation due to different reasons; the large number of contaminated areas with different shapes, geometries, compositions, and densities. Furthermore, the effect of the depth profile of gamma-emitting isotopes. In this work, a new home made computer software was developed based on a simple model for dose-rate factors computation of radionuclides distribution in soil. The software used Monte Carlo simulation for model solution. The developed software was used for studying the main factors that affect the exposure dose rate; among those are the contaminated soil (source term) geometries, the shape, the composition, and the density. In addition, the effect of radioactivity depth profile was studied using the soil layers' model. The results of the dose-rate factors show that (a) the variation of shape and the density has a slight effect on the calculation. The effect of source term composition was up to 7.4% from the standard one. (b) 98% of the dose rate comes only from the first 5 m lateral distance from the source term around the studied point. (c) The most important parameter was the depth profile of gamma emitters in soil, because about 50% of the dose rate comes from the first 5 cm of soil depth, about 20% from the second 5 cm layer, about 10% from the third 5 cm layer, and only less than 2% comes from the eighth 5 cm layer. Finally, besides the model simplicity in this work, the associated software is fast, and the calculated results are compatible with the international models.

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