Cesium iodide (CsI) is a scintillation crystal. Digital X-ray detector is an important downstream

Cesium iodide, with the chemical formula CsI, appears as colorless or white crystals or crystalline powder. It is toxic and irritating. It easily deliquesces in the air, is sensitive to light, has good thermal stability, is easily soluble in water, and is easily Soluble in ethanol, slightly soluble in methanol, basically insoluble in acetone.

According to the “China Cesium Iodide (CsI) Industry Market In-depth Research and Development Prospects Forecast Report 2022-2027” released by the Industrial Research Center shows that the preparation method of cesium iodide mainly uses cesium carbonate and hydriodic acid as raw materials, reacts under certain temperature conditions to obtain a crude product, and then undergoes concentration, crystallization, separation and other processes to obtain the finished product. Cesium iodide can be used as scintillation crystals, chemical raw materials, analytical reagents, etc., and is used in scintillation counters, X-ray detectors, infrared spectrometers, special point light sources, special glass, medicine and other manufacturing fields.

Scintillation crystal is an important product of cesium iodide. Scintillation crystals mainly include inorganic scintillation crystals and organic scintillation crystals. Cesium iodide is an inorganic scintillation crystal that can absorb ray energy and emit fluorescence photons. It has the advantages of high ray detection efficiency and high luminous efficiency, and its emitted spectral wavelength matches well with silicon photodiodes.

Cesium iodide is used as a scintillation crystal and is mainly used in the field of digital X-ray detector manufacturing. According to the conversion process, digital X-ray detectors can be divided into two categories: direct detectors and indirect detectors; according to the shape of the sensor array, digital X-ray detectors can be divided into two categories: flat-panel detectors and linear array detectors. kind. Both flat panel detectors and linear array detectors have direct conversion and indirect conversion products. The indirect detector first uses scintillation crystals to convert X-rays into fluorescence signals, and then uses photodiodes to convert them into electrical signals. The scintillation crystals are indispensable. sex.

The scintillation crystal used in digital X-ray detectors mainly uses materials such as cesium iodide and gadolinium oxysulfide. Cesium iodide has the characteristics of high scintillation efficiency, high spatial resolution and high spectral sensitivity to X-rays. Compared with gadolinium oxysulfide, cesium iodide has higher sensitivity, lower dose of X-rays and is relatively safer. Moreover, under the same requirements and working conditions, the performance of digital X-ray detectors using cesium iodide as scintillation crystal is better than that of gadolinium oxysulfide. Therefore, cesium iodide has a higher application rate in scintillation crystals for digital X-ray detectors.

In 2021, the global digital X-ray detector market will be approximately US$2.06 billion; it is expected that from 2022 to 2027, the global digital X-ray detector market will grow at an average annual compound growth rate of about 6.0%. By 2027, the market size will reach More than US$2.92 billion. The global digital X-ray detector industry has good development momentum, which is conducive to the expansion of the cesium iodide market.

Industry analysts said that in the Chinese market, cesium iodide manufacturers include China National Mineral Resources Group Co., Ltd. and other professional manufacturers. At the same time, in order to layout the upstream and downstream of the industrial chain and improve core competitiveness, digital X-ray detector manufacturers are also increasing their efforts to enter the cesium iodide market. For example, Kangzhong Medical has mastered the key technologies of cesium iodide evaporation and packaging, and Yirui Technology It is planned to build a scintillator material mass production project, including cesium iodide, gadolinium oxysulfide, etc. In the future, my country’s cesium iodide production capacity will continue to increase.