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The 40 mm x 40 mm x 350 mm BaF2:5%Y (mole fraction) crystals were grown by vertical Bridgman method. The doping content, scintillation properties, optical properties and irradiation damage of crystal samples were studied. The Y3+ doping concentration (mole fraction) is 5. 1% ± 0. 9% within the range from 0 to 300 mm from seed end. The average light output of crystal sample is 2 100 ph / MeV, and the optimal energy resolution at 662 keV is 10. 1%. After 60Co source was used to irradiate the sample with an accumulated dose of 1 Mrad, the transmittance of the sample at 220 nm wavelength decreases from 87. 3% before irradiation to 83. 5%, the transmittance at 300 nm wavelength decreases from 91. 8% to 89. 9%. The anti-irradiation performance of BaF2:Y crystal is worse than that of BaF2 crystal. After the accumulative dose irradiation, the absorption of BaF2:Y crystal to 300 nm light is significantly enhanced. [ABSTRACT FROM AUTHOR]

Scintillators, which can emit visible photons under γ- or X-ray excitation, are widely used in radiation detection. Traditional inorganic scintillators usually have some drawbacks, such as hygroscopicity or a high synthesis temperature, and most of them are poisonous. Hence, we report the synthesis of metal iodate scintillators (Eu(IO3)3 and Tb(IO3)3) by a facile hydrothermal reaction that exhibit good radioluminescence (RL) intensity. To further increase the RL intensities, we prepared Eu(IO3)3:xSm and Tb(IO3)3:xGd with stronger RL intensities and higher sensitivities than BaF2 and PbWO4 powders when x = 3%. Furthermore, we obtained scintillating films consisting of Eu(IO3)3:3%Sm and Tb(IO3)3:3%Gd for X-ray imaging. Our Eu(IO3)3:3%Sm and Tb(IO3)3:3%Gd films revealed excellent luminescence under high-energy X-ray excitation and spatial resolutions down to 9 lp mm−1 and 8 lp mm−1, respectively. Thus, these films can be regarded as candidate materials for X-ray imaging. [ABSTRACT FROM AUTHOR]