When the gamma rays go through the physical environment, they declined the part due to the intensity of interaction with a material field when they go through before being absorbed inside where detectors. The decline of the beam of gamma rays obey the rule function exp. For example, the decline depends on thickness of material, density, composition of the elements in the material. The most commonly used method of high speed pulse with the characteristic energy gamma rays from gamma spectroscopy is the method area of the Summit, called the standard method. [Y. Shirakawa (2000); F. g. Knoll (2000)]. The Summit area is recorded by the probe proportional to the flux of gamma rays emitted from the source. It depends on the performance recorded and corner blocks between the source and the detector, ... etc. are used very good for point source.
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