Gadolinium oxyorthosilicate

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Gadolinium oxyorthosilicate (known as GSO) is a type of scintillating inorganic crystal used for imaging in nuclear medicine and for calorimetry in particle physics.

The formula is Gd2SiO5. Its main properties are shown below:

Density (g/cm3) 6.7
Melting Point (°C) 1900
Radiation Length (cm) 1.38
Decay Constant (ns) 50-60
Light Yield (relative BGO=100%) 110
Index of Refraction 1.87
Peak Excitation (nm) 350
Radiation Hardness (rad) >106
Hygroscopic No