Introduction:

Thallium bromide (TlBr) crystal is a new type of room temperature nuclear radiation detector material, which belongs to semiconductor crystal, it can be used to detect X-rays, gamma rays and blue light. Its characteristic is that it can directly and effectively convert high-energy particle signals into electrical signals. It has a high atomic number (Tl:81, Br:35), high density (7.56g/cm3), large band gap (2.68eV), and when working at room temperature, it has high detection efficiency for γ-rays and can obtain very high energy resolution. Compared with conventional CZT crystal, TlBr crystal has the characteristics of high detection efficiency, high spatial resolution and low price. It can be widely used in nuclear medicine, environmental monitoring, security inspection, high-energy physics and other fields.  

Yong Hee Photonics already have a stable and perfect crystal blank growth process. The largest blank we have grown so far is Φ64x50mm, and we can process crystal and produce devices with various dimensions upon request.

Performance parameter:

ER: ~2%@Cs137; ER: ~4.5%@Co57

μτe: 1.0x10^-3(cm²/v); μτh: 5.7x10^-4(cm²/v);

TlBr has three main advantages over CZT:

1. High detection efficiency: the average atomic number is high, the density is high, and the ray blocking ability is strong, so the crystal can be thinner. To detect rays of the same energy (^99mTc), TlBr needs to be 1.5mm thick, while CZT needs to be 5mm thick. And if the ray energy is higer, theTlBr has more obvious advantages.

2. High spatial resolution: due to different ray blocking abilities, CZT is more easily penetrated for oblique incident rays, resulting in misjudgment of the incident position of rays, while TlBr can better screen the oblique incident rays.

3. High yield rate: determined by the crystallization characteristics of the two materials, CZT crystal growth is more difficult, prone to problems such as polycrystalline or cracking, while TlBr is a simple ionic crystal, and its blank growth yield and processing yield are relatively high.