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

Abstract

Abstract 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‐TeO 2 ‐MoO 3 (BTM) glass and BaO‐TeO 2 ‐WO 3 (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.