Gadolinium oxyorthosilicate

Gadolinium oxyorthosilicate (known as GSO) is a type of scintillating inorganic crystal used for imaging in nuclear medicine and for calorimetry in particle physics.^[1]

Gadolinium oxyorthosilicate

Names
IUPAC name dioxido(oxo)silane;gadolinium(3+);oxygen(2-)
Other names Gadolinium(III) oxyorthosilicate
Identifiers
CAS Number	12207-95-3 Y
3D model (JSmol)	Interactive image
ChemSpider	57449448
EC Number	235-386-1
PubChem CID	44150499
CompTox Dashboard (EPA)	DTXSID60924071
InChI InChI=1S/2Gd.O3Si.2O/c;;1-4(2)3;;/q2*+3;3*-2 Key: XEVCWPDRHSBFQW-UHFFFAOYSA-N
SMILES [O-2].[O-2].[O-][Si](=O)[O-].[Gd+3].[Gd+3]
Properties
Chemical formula	Gd2O5Si
Molar mass	422.58 g·mol−1
Density	6.7 g/cm3
Melting point	1,900 °C (3,450 °F; 2,170 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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