CdWO4 Cadmium tungstate crystal is a high density, high atomic number scintillator with a relatively high light yield. The emission maximum is at 475nm and the total light output is 12 to 15 photons/keV. The light yield relative to NaI(Tl) on a bialkali PMT is 30 to 50%. In addition, CdWO4 Scintillator cadmium tungstate scintillator also has the advantages of strong radiation resistance and no radioactive background. https://www.ostphotonics.com/products/cdwo4-cadmium-tungstate-inorganic-scintillators.html