EPR/ENDOR investigations of γ-irradiated steroid hormone single crystals

The molecular structure of free radicals formed in certain γ-irradiated steroid hormones and cholesterol determined by electron spin resonance (ESR) and electron nuclear double resonance studies has been reviewed. The influence of intermolecular interactions and hydrogen bonds on the structure of the radicals formed, as well as the effect of substitution of hydroxyl group on the α-hyperfine splitting tensor have also been analyzed.