This is a brand new BGO crystal with all sides polished and five sides coated with a 0.2mm reflecting layer (BaSO4 reflector). There are 4 options in terms of size and coating: 

A. 6x6x10mm with 0.2mm BaSO4 coating on 5 sides

B. 6x6x10mm without coating

C. 6x6x20mm with 0.2mm BaSO4 coating on 5 sides

D. 6x6x20mm without coating

 

Bi₄Ge₃O₁₂ (BGO) refers to a scintillation crystal made from Bismuth Oxide and Germanium Oxide. BGO is a widely used inorganic scintillator material known for its several desirable characteristics in radiation detection and medical imaging, such as high density, high effective atomic number and high stopping power for gamma rays. 

 

Density(g/cm3)	7.13
Wavelength of emission max(nm)	550
Light output(Photons/Mev)	60,000
Decay time(ns)	1,020
Cleavage plane	No
Hygroscopic	Slightly
Refractive index	1.79
Hardness(Mho)	2