Abstract
Abstract : The particular problem treated in this document is the determination of the thickness of material that must be traversed by incident radiation coming from every direction if it is to reach a particular body-interior point. Specifically, we have calculated the fractional solid angle subtended, around each of twelve body points, by various tissue thicknesses. As a part of this calculation, contours of 'isothickness' are given for a seated 75-percentile man. The tables of fractional solid angle vs. tissues thickness are directly useful in computing a body point dose in an isotropic radiation flux. The contours of constant tissue thickness are needed to compute numerically the body point dose in a known non isotropic radiation field. Coupled with the de tailed design of a spacecraft, the dose to these specific body points from a given incident radiation could be calculated.
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