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A set of 10 nanocrystalline carbonate-containing calcium hydroxyapatites (HAs) with various mean crystal sizes below 100nm was prepared by dry milling in air of commercial HA (platelets ca. 100nm in size). The obtained crystallites had prolate plate-like shapes as in the bone mineral. The apatites were then irradiated at room temperature by γ-rays (a 60 Co γ-source, a 7kGy dose, an irradiation...
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