EPR spectra of γ-irradiated hydrated barium dithionate single crystals

Abstract

539.1 EPR spectra of barium dithionate hydrate single crystals γ-irradiated at low (80 Gy) and high (10 kGy) doses are studied. Four lines, the strongest of which is due to the SO 3 − radical, are observed in the EPR spectrum of the low-irradiated samples. Another line seems to belong to SO 2 − . The strong line and weak lines with hyperfine structure and lines for pairs of closely spaced SO 3 − centers with a strong angular dependence are observed at high irradiation doses. The main values of the SO 3 − hyperfine coupling tensor and the dipole-dipole coupling constants of the SO 3 − pairs are determined. A quantum-chemical calculation of the electronic structure of isolated SO 3 − and SO 2 − radicals is performed. Values of the g tensors and hyperfine couplings are calculated.

Potassium dithionate EPR dosimetry for determination of absorbed dose and LET distributions in different radiation qualities

“…The radical yield can in some cases be further enhanced by transition metal dopants (Gustafsson et al 2005). The far most intense absorption line has been identified as due to SO3 -anion radicals in some cases stabilized at two inequivalent sites (Baran et al 2006(Baran et al , 2007(Baran et al , 2008. This is similar to the radical formation observed in irradiated caesium dithionate (Mahgoub et al 1983(Mahgoub et al , 1994.…”