Update of 40K and 226Ra and 232Th series γ-to-dose conversion factors for soil

Over the last four decades, the dose conversion factors used to calculate external exposure to γ radiation from soil from 40K and the 226Ra and 232Th chains have been 0.62, 0.042 and 0.46 (nGy/h per Bq/kg), respectively. This work updates these γ-to-dose conversion factors, taking into consideration...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2014-12, Vol.138, p.68-71
Main Authors: Gasser, E., Nachab, A., Nourreddine, A., Roy, Ch, Sellam, A.
Format: Article
Language:English
Subjects:
226Ra chain
232Th chain
40K
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Dose conversion factor
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
MCNPX
Soil
Techniques
Terrestrial environment, soil, air
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Summary:Over the last four decades, the dose conversion factors used to calculate external exposure to γ radiation from soil from 40K and the 226Ra and 232Th chains have been 0.62, 0.042 and 0.46 (nGy/h per Bq/kg), respectively. This work updates these γ-to-dose conversion factors, taking into consideration the composition, depth and radius of the soil source, and importantly, updated branching ratios, with MCNPX simulations. The new conversion factors are 0.036, 0.357 and 0.482 (nGy/h per Bq/kg) for 40K and the 226Ra and 232Th chains, respectively. •Conversion factors γ-to-dose for soil was studied.•An updates of these γ-to-dose conversion factors, taking into consideration importantly, updated branching ratios.•MCNPX simulations are applied.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2014.08.002