Growth and characterization of a PbI₂ single crystal used for gamma ray detectors

Abstract

Lead iodide (PbI 2 ) is an important material for room temperature radiation detectors. In this paper, we have grown PbI 2 single crystal through a special craft, from which γ-ray detector has also been fabricated. X-ray diffraction analysis indicates structure of the grown crystal is 2H with hexagonal space group P3m1. Infrared transmission measurement shows transmission rate of the grown crystal sample (10×10×1mm 3 ) reaches 40% averagely in range of 400~4000cm . Ultraviolet absorbing test indicates cut-off wavelength of the sample is 547.6nm, corresponding band gap of 2.27eV. Room temperature detector fabricated from the grown crystal is sensitive to 241Am 59.5KeV γ-ray. Full width at half maximum (FWHM) of the obtained energy spectrum is 26.7KeV. All the results indicate the PbI 2 crystal grown through the special craft is of good characteristics and can be used for γ-ray detector.

Optical and structural properties of lead iodide thin films prepared by vacuum evaporation method

“…It can be inferred from the observed and JCPDS data of table 1 that the strongest peaks are observed for d values 2.33 Å and 1.75 Å respectively correspond to the plane (0 0 3) and (0 0 4). The XRD analysis confirmed that PbI 2 films are polycrystalline, having hexagonal structure [11]. The raw X-ray data repeatedly modified by means of Gaussian fit enabled one to build up the present figure (Fig.…”

Electrical characteristics of lead iodide crystal devices on flexible substrate under mechanical tensile strain

“…Recently, polycrystalline PbI 2 thick films have attracted lots of attention for digital X‐ray flat‐panel detector (FPD) applications combined with large‐area thin‐film transistor (TFT) array substrates . Several effective methods have been employed for PbI 2 single‐crystal growth, such as traveling molten zone (TMZ) , zone melting , vertical Bridgman , Czochralski , and vapor transport . Also, it is certain that highly purified PbI 2 is needed when used for crystal growth and detection application .…”

Growth of lead iodide single crystals used for nuclear radiation detection of Gamma‐rays

“…The transmission rate of the two crystals reaches 50% in the range of 4000∼400 cm −1 . This value is higher than that has been reported, generally 40∼45% . Based on the solid state physics theory, the theoretical infrared transmission rate of the PbI 2 crystal can be calculated to be 58.8% .…”