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 Rb₄Li₂TiOGe₄O₁₂ (RLTG) crystals as a promising X-ray detection material and investigated their anisotropic detection performances. Under a 200 V bias voltage and 40 keV irradiation conditions, the Z-direction RLTG detector exhibits a sensitivity of 39.0 µC Gy cm⁻², which is higher than that of the X-direction RLTG detector (33.3 µC Gy cm⁻²). Furthermore, the detection limit of the Z-direction RLTG-based detector (0.927 nGy s⁻¹) is notably lower than that of the X-direction detector (3.63 nGy s⁻¹). 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.