Infra-red luminescence of mercurous chloride crystals

AbstvactWe present results from an ongoing search for inorganic scintillators for x-and gamma-ray detection. We measure the scintillation properties (luminous efficiency, decay time, and emission wavelength) of powdered samples excited by brief xray pulses. To find scintillators that are compatible with silicon photodetectors, we have tested over 1,100 samples using a photomultiplier tube with a GaAs:Cs photocathode, which is sensitive to 200-950 nm emissions. Optical filters are used to block emissions that are observable with bialkali PMTs. Several lanthanide and transition metal ions, molecular complexes, and 11-VI compounds are known to have strong emissions at wavelengths >500 nm. We find that several compounds exhibit emission intensities comparable to commercial phosphors in the 600-900 nm range, including Eu and Sm doped LuPO4, ScPO4, and YPO4. Significant emissions are also observed from Tb, Dy, Er, Pr, and Tm doped phosphates, as well as several intrinsic compounds, notably Hg2C12. Scintillation characteristics of promising compounds (in powdered or small crystal form) are presented. 10 17 LuAIO,: 0.5% Ce 994 CdF2:lO% Tb 960 ZrO2 959 GdF3:17% Sr, < I % Pr 952 * YP04:25%0 Pr 9 3 9 * LuPO4:40%0 Pr 933 * LuPO4:25% Pr 932 ErF3 930 TbF3:0.S% Ce

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Prospects for dense, infrared emitting scintillators

Moses

Weber

Derenzo

et al. 1998

IEEE Trans. Nucl. Sci.

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Infra-red luminescence of mercurous chloride crystals

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Prospects for dense, infrared emitting scintillators

Prospects for dense, infrared emitting scintillators

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