Long-Lived Electron Spin Resonances in Rats Irradiated at Room Temperature

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Abstract
Femurs of gamma-irradiated white rats revealed persistent paramagnetic centers, existing for at least several hours and exhibiting a 3 component decay curve. The magnitudes of the resonances were linearly related to dose over the range examined (1,000 to 35,000 rads). The paramagnetic centers appear to reside primarily in the inorganic bone matrix. Such long-loved centers are a potential source of damaging energy some time after irradiation occurs. Such resonances may be useful for post facto dosimetry in accidental radiation exposures. Similar long-loved resonances may be found in teeth and hair.