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PbWO4 Crystals

 

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

Scintillation properties of lead tungstate (PbWO4) crystals:

Density (g.cm-3)

8.28

Radiation length (cm)

0.92

Decay constant (ns)

6/30

Emission peak (nm)

440/530

Light yield (% that of NaI:Tl)

0.5

Melting point (°C)

1123

Hardness (Mho)

/

refractive Index 

2.16

Hygroscopicity

none

Cleavage

101


Lead Tungstate (PbWO4) crystal is a novel scintillator which has been adopted as the detect material by several high energy physics devices, e.g., CMS detector in CERN. The crystal is distinguished by its fast decay time, high density and strong radiation hardness. So it may have an extensive application prospect in medicine. It is also an excellent photoelectric crystal due to its good performance in optical properties and stable physical and chemical features.

VCSA_43Cb0s1T/