Skin dose is very difficult to measure directly and is usually estimated. The beta dose rate to the skin expressed in terms of average surface concentrations of a radionuclide on the skin gives more reliable estimates for this exposure pathway. However, the data in the literature vary as much as an order of magnitude.
In this study, we calculate external beta-ray dose rate for human skin contamination around an isotropic point source of mono-energetic electrons. The
beta-ray doses rates were computed by performing analytical integration of
a semi-empirical point dose rate function .
Evaluation of the model is realized by calculating the dose rate for the contamination of the skin at different depths for samples of air collected around the Research
Reactor located at the Atomic Energy Authority (Egypt).
Meandering of the plume i.e., low wind condition is taken into consideration.
The above mentioned treatment is applied for different meteorological states, namely
different thermal stability classes, A,B,C,D and E.
The maximum beta absorbed dose for the contamination of the skin is for stability class E for nuclide of Cs137 at depth of 20m from the skin.