"Green" Lead-Free Tellurite Glasses Used for Stable and Efficient X-Ray Detection and Array Imaging

Glass with the advantages of low cost, large area preparation, simple preparation process, and shape-controllable, has been widely used in the electric and optical fields. In this work, two novel sensitive X-ray detectors are reported using BaO-TeO₂-MoO₃ (BTM) glass and BaO-TeO₂-WO₃ (BTW) glass. Under 120 keV hard X-ray radiation, the BTM glass and BTW glass X-ray detectors exhibit sensitivities of 309 and 316 µC Gy_air ^-1 cm^-2, with minimum detection limits of 7.3 and 5.4 nGy_air s^-1, respectively. Although the BTM glass and BTW glass X-ray detectors are determined to be 239 and 287 µC Gy_air ^-1 cm^-2 under the 40 keV soft X-ray radiation, the minimum detection limits are decreased to 5.7 and 3.2 nGy_air s^-1, which are 1000 times lower than the medical detection limit (5.5 µGy_air s^-1). The array detector assembled with drawn glass used as an isolated pixel without signal crosstalk displays uniform dark current and X-ray photocurrent, resulting in clear edge X-ray imaging patterns. In our work, a novel glass application has been realized and provides a potential commercial X-ray detector.