Pages 65-68, Language: EnglishHatjigiorgis / Shiu / Flemming / KramerAn in vitro study of the influence of calcium phosphate hydroxylapatite on dose distribution in electron beam (15 MeV) radiation therapy was performed. Results indicate that no precautionary measures need to be taken. However, the need for further in vivo studies to determine the effects of such therapy on the biologic properties of material seems evident.