Modelling Three Dimensional Beta Sources for Skin Dose Calculations Using VARSKIN Mod 2

The computer code VARSKIN Mod 1 has been modified to include three-dimensional sources and insertion of layers of protective clothing between the source and skin. The new code, VARSKIN Mod 2, is described, and the sensitivity of the dose to source geometry, diameter, thickness, density, and protective clothing thickness are presented for low, intermediate, and high energy beta emitters. Finally, doses calculated using VARSKIN Mod 2 are compared with doses measured from hot particles found in nuclear power plants. The results indicate that VARSKIN Mod 2 will greatly improve the accuracy of hot particle dosimetry.