:Gadolinium oxyorthosilicate

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| Name = Gadolinium oxyorthosilicate

| IUPACName = dioxido(oxo)silane;gadolinium(3+);oxygen(2-)

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| Gadolinium(III) oxyorthosilicate

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| CASNo = 12207-95-3

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| ChemSpiderID = 57449448

| DTXSID = DTXSID60924071

| EC_number = 235-386-1

| PubChem = 44150499

| StdInChI=1S/2Gd.O3Si.2O/c;;1-4(2)3;;/q2*+3;3*-2

| StdInChIKey = XEVCWPDRHSBFQW-UHFFFAOYSA-N

| SMILES = [O-2].[O-2].[O-][Si](=O)[O-].[Gd+3].[Gd+3]

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| Section2 = {{Chembox Properties

| Gd=2|O=5|Si=1

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| Density = 6.7 g/cm³

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| MeltingPtC = 1900

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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.{{Cite journal |last1=Suzuki |first1=H. |last2=Tombrello |first2=T. A. |last3=Melcher |first3=C. L. |last4=Peterson |first4=C. A. |last5=Schweitzer |first5=J. S. |date=1994-08-01 |title=The role of gadolinium in the scintillation processes of cerium-doped gadolinium oxyorthosilicate |url=https://dx.doi.org/10.1016/0168-9002%2894%2990586-X |journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |language=en |volume=346 |issue=3 |pages=510–521 |doi=10.1016/0168-9002(94)90586-X |bibcode=1994NIMPA.346..510S |issn=0168-9002|url-access=subscription }}

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

class="wikitable"
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