الفهرس 
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Abstract
In the field of nuclear radiation detection knowledge of the fraction
of the intensity emitted from the source and being registered by the
detector, which is known as the geometry factor, is very important in the
determination of the total emitted number of disintegrations The value of the geometry factor depends on the dimensions of the detector and the radiation source, their shapes, the distance between them and the relative directions. Knowledge of the solid angle subtended at a radiation source by a detector is required in the determination of the geometry factor.