Crystalline Characterization of TlBr Semiconductor Detectors Using Wavelength-resolved Neutron Imaging

Abstract

Thallium bromide (TlBr) has been one of the promising gamma-ray detector materials because of its high gamma-ray attenuation length, availability of room-temperature operation, and relatively high energy resolution. However, the high-resolution detector has been limited to a relatively small size. Hence, the next task in the TlBr development is to establish fabrication processes of large detectors. As one of the candidates for evaluating the TlBr crystal quality, we demonstrated neutron Bragg-dip imaging, which is one of the neutron diffraction techniques and is based on wavelength-resolved neutron imaging. All the studied samples seemed to be imperfect crystals and slightly distorted. Although differences in crystal orientation distributions among the samples cannot be obtained from the present data, it is suggested that one of the crystals has a boundary, or possibly a small crystal grain near the crystal center, which may result in a low-quality electron mobility and lifetime (μτ) product.

Characterization of coincidence time resolutions of TlBr x Cl1−x crystals as Cherenkov radiators

“…TlBr has also been studied for X-ray imaging. 25) Wavelength-resolved neutron imaging, 26) photoluminescence and X-ray-induced radioluminescence analyzes 27) have been performed to characterize TlBr crystals. One of the attractive applications of TlBr detectors is positron emission tomography in which the detectors require good detection efficiency and timing performance.…”

Characterization of Ce-doped Li2O–ZnO–P2O5 Glasses for Thermal Neutron Detection

“…Scintillation detectors are one of the most widely used radiation detectors, which consist of a photodetector and a scintillator. (1)(2)(3)(4)(5)(6) Scintillators can show luminescence under ionizing radiation excitation and they are applied for medical imaging, (7) nondestructive inspection, (8,9) and well logging. (10,11) Scintillators are required to have a high light yield, a fast decay time, and a high detection efficiency.…”

Growth, Optical, and Scintillation Properties of (Gd0.4Lu0.6)8Sr2(SiO4)6O2 Crystals

“…(1)(2)(3) Scintillators are generally combined with photodetectors such as a photomultiplier tube (PMT) and a Si photodiode, and such sensors are called scintillation detectors. (4) When compared with semiconductor detectors, (5)(6)(7)(8) which are also common ionizing radiation detectors, scintillation detectors have some advantages especially in terms of detection efficiency and response speed. Owing to such properties, scintillation detectors are used in medicine, (9) security, (10) environmental monitoring, (11) biology, (12) resource extrapolation, (13) and high-energy physics.…”