High density scintillation material; γ-ray absorber. Single crystal growth and characterization: R. Nitsche, J. Appl. Phys. 36, 2358 (1965); R. V. A. Murthy et al., J. Cryst. Growth 197, 865 (1999); J. B. Shim et al., ibid. 243, 157 (2002). Luminescence properties: M. J. Weber, R. R. Monchamp, J. Appl. Phys. 44, 5495 (1973). Temperature-dependent scintillation properties: H. V. Piltingsrud, J. Nucl. Med. 20, 1279 (1979). Laser-excited optical properties: F. Rogemond et al., J. Lumin. 33, 455 (1985). Optical and photoelastic properties: P. A. Williams et al., Appl. Opt. 35, 3562 (1996). Thermophysical properties: V. D. Golyshev et al., J. Cryst. Growth 262, 202, 212 (2004). Performance in PET applications: G. Gervino, E. Monticone, Sens. Actuators A 41-42, 487 (1994); in radiation detectors: Z. S. Macedo et al., Nucl. Instrum. Methods Phys. Res. B 218, 153 (2004).