The luminescence efficiency of CsI(Na) is similar to that of NaI(Tl) crystals. The emission spectrum peaked at 420nm can match well with PMT. Its temperature dependence is small and can be mainly applied in the well logging. Regular size: Dia 50mmx Length300mm Customized sizeï¼?Dia 39mmxLength 49mm Typesï¼?Blank and aluminum encapsulation Property of our CsI(Na) Density (g/cm3) 4.51 Light Yield NaI(Tl) (%) 85 Radiation length 1.86 Emission peak(nm) 420 Hygroscopicity deliquescent Hardness (Mohs) 2 Melting point(â??) 621