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The work presented in this thesis deals with study of; (i) buildup factors in composite materials like HCO-materials (materials containing H, C and 0 as constituents), soils, water, air and concrete, and (ii) the phenomenon of multiple scattering of gamma rays in different soils. From shielding point of view the two parameters which are of interest to scientific Community, are the set of attenuation coefficients and the buildup factors of the given materials for a wide energy range and penetration depth. In literature attenuation coefficients data in a variety of compounds and elements is...