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Cryst. Res. Technol. 341999 7 915-923Crystals of triglycine sulphate (TGS) doped with orthonitroaniline (ONA) irradiated with different doses of γ-radiation were used to investigate γ-radiation effect on electrical and optical parameters. The absorption coefficient and the reflectance were measured and hence the extinction coefficient, the optical refractive index and the dielectric constants (ε r ', ε r '') of unirradiated and irradiated TGS crystals were calculated. Values of the allowed indirect optical energy gap E g opt. of TGS doped with ONA were calculated as a function of γ-dose. Value of E g opt. decreases from 4.72 eV to 4.25 eV with increasing γdoses from 0 up to 3 Mrad. The values of the static dielectric constant ε r (0) and the effective electrical conductivity σ 0 at room temperature and their dependence on γ-dose were also calculated.

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