Thallium chalcohalides for X-ray and γ-ray detection

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Solid-State Physics

Background:

• High-performance materials are crucial for sensitive X-ray and gamma-ray detection.
• Current detectors like cadmium zinc telluride (CZT) have limitations for room-temperature operation.
• Chalcohalide compounds present an unexplored area for radiation detection applications.

Purpose of the Study:

• To evaluate the potential of the chalcohalide compound Tl(6)SeI(4) for efficient X-ray and gamma-ray detection.
• To compare the performance of Tl(6)SeI(4) with the state-of-the-art CZT material.
• To investigate the material properties and carrier transport characteristics of Tl(6)SeI(4).

Main Methods:

• Synthesis of high-quality single-crystalline wafers of Tl(6)SeI(4).
• Measurement of detector-grade resistivities.
• Assessment of electron and hole carrier transport properties.
• Performance evaluation using Co-57 radiation source for pulse height spectroscopy.

Main Results:

• Tl(6)SeI(4) exhibits a higher figure of merit compared to CZT for room-temperature operation.
• Synthesized Tl(6)SeI(4) wafers possess detector-grade resistivity and good carrier mobility.
• Pulse height spectra demonstrate energy resolution comparable to commercial CZT detectors.

Conclusions:

• Tl(6)SeI(4) is a promising material for next-generation X-ray and gamma-ray detectors.
• The material's performance at room temperature suggests potential for portable and cost-effective radiation detection systems.
• Further research into Tl(6)SeI(4) could lead to advancements in nuclear physics, medical imaging, and security applications.