الفهرس 
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Abstract
The gamma and x-rays are both froms of electromagnetic radiation indivdual wave packets of this radiation are called photons the main difference between gamma ray and x-rays is their origin while x-rays are produced by atomic excitation or from an electron as it changes direction when passing an atomic nucleus this latter type of x-ray is called bermstrahlung gamma rays are emitted by transition fromexcited states in the nucleus photons interaction when a narrow beam of monoenergetic photons with incident intensity entering a layer of material the number of poton that interacts with it i is given by eq.1.1 1*=1(1-e-ux).