“…In recent years, Hassan et al 1) have reported that bioglass (45% SiO 2 , 24.5% CaO, 24.5% Na 2 O, and 6% P 2 O 5 ) was tenfold more sensitive than commercial alanine dosimeters. In a previous paper, 2) we reported that an ESR signal was observed in X-ray irradiated CdS-doped glass, which contains CdS nanocrystals in silicate glass. CdS nanocrystals act as the source of electrons and holes.…”