Abstract

The low-temperature esr spectra of γ-irradiated calcium phosphate samples, that are similar in structure and composition to the principal inorganic components of bone and tooth, are interpreted in terms of the radicals ${\rm PO}{}_{4}{}^{-2},{\rm O}^{-}$, and H. There are indications in the low-temperature esr spectra of some γ-irradiated collagenous materials that most of the damage is concentrated randomly along the main peptide chains and that relatively few radicals are formed in the side chains of the amino acid residues.

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