Fig. 5
From: Direct radiation-induced effects on dental hard tissue
XRD patterns of a enamel and b dentin in the three groups. The enamel and the dentin were composed of various amounts of hydroxyapatite [HA, Ca10(PO4)6(OH)2] and calcium-deficient apatite [Ca10-x(HPO4)x(PO4)6-x(OH)2-x, x = 0.5–1.3]. Based on the Joint Committee on Powder Diffraction Standards (JCPDS) cards, no new phase was detected in the 30-Gy and 60-Gy groups