| Properties | CsI(Tl) | CsI:Na | CsI |
| Density（g.cm-3） | 4.53 | 4.51 | 4.51 |
| Radiation length(cm) | 1.86 | 1.86 | 2.43 |
| Decay constant(us) | 1 | 0.63 | 16 |
| Emission peak(nm) | 550 | 420 | 315 |
| Light yield(%NaI:Tl) | 47 | 85 | 4月6日 |
| Afterglow(@75ms) | 0.5~3% | / | / |
| Melting point(°C) | 621 | 621 | 621 |
| Hardness(Mho) | 2 | 2 | 2 |
| refractive Index | 1.78 | 1.84 | 1.95 |
| Hygroscopicity | slightly | Yes | Slightly |
| Cleavage | none | none | none |
| Density (g / cm3) | 4.51 |
| melting point （℃） | 894 |
| Coefficient of thermal expansion (k-1) | 54 x 10-6 |
| Energy resolution FWHM | 6.5-8% |
| Mohs hardness (Mho) | 2 |
| Moisture absorption | Slightly |
| Maximum emission wavelength (nm) | 550 |
| Shortest wavelength （nm） | 320 |
| Refractive index | 1.79 |
| Decay time (NS) | 1000 |
| Afterglow (after 30ms) (%) | 0.5 - 0.8 |
| Light yield (photons / keV) γ） | 52- 56 |
| photon [% of NaI(Tl)] (y rays) | 45 |
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