Abstract
Electron paramagnetic resonance studies were conducted on synthetic calcium hydroxy apatite samples co-doped with 239Pu and carbonate ion. These investigations were carried out to assess the self-irradiation effects in bone and teeth on exposure to plutonium, as calcium hydroxy apatite is the major constituent of bone and teeth. On self-irradiation, in addition to the signal from O- ion arising from the radiolysis of hydroxide ion, EPR signals due to CO2 -, PO2 2- and another signal assigned to surface O- ions were observed in the samples. In freshly quenched gamma irradiated samples, signals from CO3 -, O- , PO2 2- and O2 - ions were observed. The EPR signal of O2 - ion shows a doublet splitting suggesting that O2 - ion gets preferentially stabilized close to Pu4+. The radiation damage due to Pu4+ at Ca2+ sites, in the sample appears to be lower as compared to that due to external gamma-irradiation. Moreover, the alpha-dose in 239Pu doped samples has self-annealing effects. These are attributed to localized radiation damage due to alpha-particles compared to evenly distributed radical ions produced due to gamma-irradiation.
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Natarajan, V., Seshagiri, T.K., Veeraraghavan, R. et al. Radiation effects in plutonium and carbonate co-doped calcium hydroxy apatite: An EPR study. Journal of Radioanalytical and Nuclear Chemistry 256, 445–449 (2003). https://doi.org/10.1023/A:1024591414217
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DOI: https://doi.org/10.1023/A:1024591414217