“…However, a typical enamel compound is usually made from a mixture of (35-60%SiO 2 , 2-15%AlO 2 , 9-25%CaO 2 , 1-25%MgO, and 1-26%FeO, here and elsewhere, wt-%), as well as small impurities of Na 2 O, P 2 O 5 , TiO 2 and small quantities of other oxides. 27 The laboratory gamma spectra measurements were performed using two detectors. A NaI(Tl) detector, 50 mm in diameter, 50 mm in length (BICRON, model 2M2/2) and a high purity germanium (HPGe) coaxial detector (CANBERRA, model GC1518-7500).…”