Microspherical sintered bodies of hydroxyapatite thus obtained, which may be modified by an optical heat treatment to adjust the surface area of the sintered body and growth of crystals therein, are useful in various fields of industry, for example, as {HEAD ~ a sorption agent} in {TAIL ~ chromatographic separation} 
Microspherical sintered bodies of hydroxyapatite thus obtained , which may be modified by an optical heat treatment to adjust the surface area of the sintered body and growth of crystals therein , are useful in various fields of industry , for example , as { HEAD ~ a sorption agent } in { TAIL ~ chromatographic separation }
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