Study of nuclear quadrupole interactions in different environments of decaying atoms of ⁷⁵Se by sum peak method

The sum peak intensity I₄₀₀ (279 + 121 keV) relative to its singles peak intensity I₂₇₉ or I₁₂₁ has been determined in various environments of ⁷⁵Se by gamma–gamma summing technique in a single HPGe detector. The change in intensity has been used to determine nuclear quadrupole interaction frequencies and electric field gradient components in different environments, e.g. Se-glycerol, Se-hydrochloric acid (HCl), Se-perchloric acid (HClO₄), Se-blood samples with and without anti-coagulant, Se-alanine and Se-cysteine at different pH values. The electric field gradient is found to vary with chemical complex formation.