Visible to infrared low temperature photoluminescence of rare earth doped bismuth germanate crystals.
In this paper, the influence of a series of rare earth (Eu, Tm, Nd) and Cr ion doping on the optical properties of BGO was investigated by means of photoluminescence (PL) from visible to IR region in the 10-300K temperature range using different types of detectors, namely, photomultiplier tube (PMT), InGaAs (IGA), and Si. Several samples were investigated having dopants concentrations of 0.3wt%Nd, 0.4wt%Tm, 0.06wt% Cr and 3ppm Eu. The PL spectra of the samples showed different luminescence behaviour which is assigned to the 4f intra shell transition from rare earth ions. The temperature dependence of the PL from rare earth doped BGO crystals is also examined.
Crystal scintillators for use in check-light source for thermoluminescent systems
Abstract Beta ( 63 Ni , Emax 0.063 MeV) excited radioluminescence of indigenously grown crystal scintillators CsI(Tl), Bi4Ge3O12 and CdWO4 has been studied for its use in check-light source needed for thermoluminescence systems. Temperature coefficient of the light output over 298–323 K and the beta-induced TL of the scintillators over 298–553 K are reported.
A new BGO crystal with higher radiation hardness
Abstract A new BGO crystal with higher radiation hardness was successfully developed in the Shanghai Institute of Ceramics, Academia Sinica. As compared with the normal BGO crystal, the new crystal possesses less radiation damage and faster recovery after 1000–10 000 rad 60 Co γ-ray radiation, but with no large change on the light output, energy resolution, transmission and optical uniformity properties.