Bovine compact bone powder was irradiated with alpha-particles of 241Am, 12C6+ and 35Mg12+ ion beams, then examined by the e.p.r. spectroscopy. The stable e.p.r. signal found is of the same characteristic as that observed in gamma-irradiated bone (g perpendicular = 2.0017, g parallel = 1.9973, delta Hpp = 0.85 mT). Thus, the structure of radiation induced paramagnetic center in bone does not depend on the LET of radiation used. The radiolytic yields of the formation of stable paramagnetic centres in bone powder irradiated with gamma-rays are G gamma = 0.08 +/- 0.01 while with 12C6+ ion beams roughly about Gc = 0.02, respectively.
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