Biological Effects and Exposure Limits for ''Hot by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Additional resources for Biological Effects and Exposure Limits for ''Hot Particles'': Recommendations of the National Council on Radiation Protection and Measurements (Ncrp Report, No. 130)

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The VARSKIN MOD2 code was modified slightly to treat also the imbedded sphere, retaining emission data and spectra incorporated into that code. 2. The inclusion of energy-loss straggling in the point-kernel calculations improves the agreement with the Monte Carlo results, most obviously in the tail of the absorbed-dose distribution. As the size of the source volume increases, the increasing discrepancies indicate the shortcomings of the assumption inherent in both of these point-kernel approaches of the hot particle being simply high-density water.

A similar conclusion was reached on the basis of histological studies in pig skin after x irradiation (Morris and Hopewell, 1989). , 1976). These findings have important implications for large-field irradiation with beta rays, since basal cells from withln the canal of hair follicles will be spared in exposures involvingintermediate-energy beta-emitting radionuclides. Following doses in excess of that usually associated with a high probability of developing moist desquamation, the area of irradiated skin is completely denuded of surviving clonogenic epithelial cells.

Simple density scaling of the distances through the various materials is used in conjunction with the transition curve. l0This transition is due to the net migration away from the point source of the energy transferred to secondary electrons and eventually deposited in the medium. This occurs over a distance associated with the secondarg electron range, beyond which the assumption of electron equilibrium applies for the energies considered here. 6 1 27 Comparisons for Pertinent Hot-Particle Geometries Monte Carlo calculations were done to provide results for direct comparison with the point-kernel-integration calculations for threedimensional hot particles.

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