STUDY OF THE DEPENDENCE OF GAMMA-ABSORPTION COEFFICIENT ON THE ORDER OF THE DOUBLE LAYER SHIELD

Gamma absorption coefficient dependence on the order of the shielding material is measured using a proper electronic system and Cs-137 source. The measurements were carried out for iron, steel, copper, brass, lead and concrete as shielding materials. The dependence of gamma absorption coefficient on the atomic number and density of the absorber material is taken into account. The experimental and theoretical calculations are in a good agreement. It is found that the absorption coefficient value increases with increasing the absorber thickness of high atomic number (or density) and decreases with increasing the absorber thickness of low atomic number (or density), and slightly changes with increasing the thickness of any absorber when the difference between their atomic number (or density) is small, whereas it is affected by the order of the two-layer absorber if the difference between their atomic number is high.