Ultralow Detection Limit X-Ray Detectors Based on Rb4Li2TiOGe4O12 Single Crystals with Anisotropic Responses

Abstract

X-ray detectors are extensively utilized in industrial inspection, cosmic physics research, medical diagnosis, and imaging. In this study, we have explored the potential application of Rb 4 Li 2 TiOGe 4 O 12 (RLTG) crystal as a promising X-ray detection material and investigated its anisotropic detection performances. Under 200 V bias voltage and 40 keV irradiation conditions, the Z-direction RLTG detector exhibits a sensitivity of 39.0 μC/ Gy cm², which is higher than that of the X-direction RLTG detector (33.3 μC/Gy cm²). Furthermore, the detection limit of the Z-direction RLTG-based detector (0.927 nGy/s) is notably lower than that of the X-direction detector (3.63 nGy/s). This work examines the anisotropic X-ray responses of RLTG crystals, demonstrating that RLTG is a potential X-ray detection material whose performance can be enhanced by selecting a specific orientation.