Effective atomic number (Zeff) and electron densities (Ne) have been determined for LArginine LR at 122, 356, 511, 662, 1170, 1275 and 1330 keV Gamma ray energies. The gamma rays were detected by using a well-type scintillation spectrometer .Results were compared with theoretically calculated values and fairly good agreement was found between them within an average experimental error. The variation of effective atomic number and electron densities have been plotted as a function of photon energy. The effective atomic number and effective electron densities are found to nearly remain constant as a function of energy.