Abstract
A Monte Carlo method utilizing total variance reduction is applied to the calculation of the solid angle subtended by a parallelepiped detector from an arbitrarily positioned point. Although there is an analytical expression for the solid angle subtended by a rectangle from an arbitrary point, the method should prove valuable when a mean solid angle from a distributed source is required. In addition, the algorithm provides an efficient way to sample the directions of gamma rays which intercept a parallelepiped detector, required in the Monte Carlo calculations of the efficiency of square detectors.
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