Comparison Between Main Physical Properties of PET Scintillation Crystals
| Crystal | Relative light output (%) | Decay time (ns) | Density (g·cm−3) | Effective atomic number (Z) | Energy resolution at 511 keV (%) |
|---|---|---|---|---|---|
| NaI(Tl) | 100 | 230 | 3.7 | 50 | 8 |
| BGO | 15 | 300 | 7.1 | 73 | 12 |
| LSO | 50–80* | 40 | 7.4 | 65 | 10 |
| GSO | 20–40* | 60 | 6.7 | 58 | 9 |
↵* Light output depends on cerium concentration and read-out device (PMT or APD).
All crystals emit light with wavelengths ranging from 410 to 480 nm.