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FIGURE 3. Comparison of ß S factor values in spheres of different masses calculated using different methods. S factors derived from 3D-ID calculations are denoted by circular symbols and are compared with Bardies and Chatal (26), denoted by square symbols, and Siegal and Stabin (27), indicated by triangular symbols. Top graph, indicated by dashed line and unfilled symbols, plots S factor values for 90Y, whereas lower graph, indicated by solid line and solid symbols, plots S factors value comparisons for 131I. It can be seen in graph that values generally fall on same line, with best coincidence seen in middle of graph and less coincidence seen on either end. Sphere of smallest radii shows most disparity of values as calculated by 3 methods.
