PbWO4 single crystal, 10 x 10 x 0.4mm, both faces polished.  

Lead tungstate ( PbWO4 ) is a new scintillating crystal discovered in 1990s. It is one of the most dense oxide crystal ( 8.3g/cm3), and is distinguished by its short radiation length ( 0.9 cm), small Moliere radius ( 2.19cm) and strong irradiation hardness.  Its scintillation light output peaks between 450-550nm with a fast component decay time in the range from 2-20ns. After irradiation with g-ray, the degradation in the optical transmittance is not large up to 106 rad. PbWO4 is considered as a promising scintillation material for electromagnetic spectrometer in high energy, nuclear physics experiment as well as nuclear medicine.

Main PropertiesCrystal structure: Tetragonal; Space group I 41 /a; Lattice constant (?? ) a = b = 5.416 , c = 12.049;  Density (g/cm3) 8.28; Radiation length (cm) 0.92; Mole re radius (cm) 2.19; Decay constant (ns) 6/30; Peak emission (nm): 440/530; Light output (%) 0.5; Index of refraction: 2.16; Melting point (oC ) 1123; Hygroscopicity:  No Cleavage (101);  Crystal boule size 30 mm in diameter x 100 mm in length