ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 27, Number 4
JKCSEZ 27(4)
August 20, 1983 

Single crystals of sodium thiosulfate (Na2S2O3) have been grown from the saturated solution by the evaporation method at the optimum condition. Radiation damages in the crystal by γ-irradiation of 20×106 Rontgen have given rise to paramagnetic centers. The anisotropic spectra of each paramagnetic species have been obtained with the X-band EPR spectrometer at room temperature. When an isotropic D.P.P.H. at g value of 2.0036 is based on. ESR Spectra of the single crystal are recorded for each rotation about the perpendicular a, b and c axis with intervals of 10° from 0°to 180° in order to find out the properties of the crystal for anglar variation of the anisotropic peaks. The g values are calculated from the line position between the anisotropic peaks and the isotropic peaks of D.P.P.H. and then principal g values and their direction cosines of the species is obtained by the diagonalization of 9 matrix elements of the corresponding g values. From the analysis of the characteristic principal g values and direction cosines for γ-irradiated Na2S2O3 crystal, anisotropic peaks corresponding to SO2+, SO2- are identified and the existences of unidentified and unstable paramagnetic defects are verified.