Scintillation properties of pure and Ca-doped ZnWO4 crystals

Authors :: Danevich, F. A.
Henry, S.
Kraus, H.
McGowan, R.
Mikhailik, V. B.
Shkulkova, O. G.
Telfer, J.
Source :: Physica Status Solidi (A) - Applications and Materials Science; February 2008, Vol. 205 Issue: 2 p335-339, 5p
Publication Year :: 2008
Abstract: Following the investigations of the structure and scintillation properties of Ca-doped zinc tungstate powder [phys. stat. sol. (a) 204, 730 (2007)] a single-crystal of ZnWO4–Ca (0.5 mol%) was grown and characterised. The relative light output, energy resolution and decay characteristics were measured for pure and Ca-doped ZnWO4 scintillators. An increase in the light yield of ∼40% compared with the undoped crystal, and an energy resolution 9.6% (137Cs) were obtained for Ca-doped ZnWO4. The observed improvement is attributed to the reduction of self-absorption (bleaching) of the crystal. The cause of bleaching as well as the possible contribution of scattering is discussed. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)