Cesium sodium tungstate scintillating material and its preparation and use

Abstract

The invention discloses a scintillation crystal of sodium caesium tungstate, and a preparation method and application thereof, wherein the chemical compositions of the crystal is Cs2-xNaxW2O7,wherein X is more than 0 and less than 2. The poly-crystals containing the compositions is prepared through the solid phase sintering method, and the single crystals containing the compositions is prepared with Bridgman Method. The crystal of sodium caesium tungstate Cs2-xNaxW2O7 with stable performance is the scintillation material with intrinsic illumination, without any doped ion, the illumination of the product excited by X-rays is strong, and the wavelength of the light couples well with the electron-multiplier phototubes of the prior art.

Description

technical field [0001] The invention relates to a cesium sodium tungstate scintillation crystal material and its preparation and use, and its chemical composition is Cs 2-x Na x W 2 o 7 , wherein 0<x<2, it is called sodium cesium tungstate, and the invention belongs to the field of new materials. Background technique [0002] Scintillation crystals can detect high-energy rays or particles such as X-rays, γ-rays, and α-particles. ) and other high-energy ray and nuclear radiation detection fields have been widely used. [0003] Due to different background conditions, each application field has correspondingly different requirements on the performance indicators of scintillation crystals. Currently commercialized scintillators have application limitations. The discovery of NaI:Tl (thallium-doped sodium iodide) in 1948 led to the invention of alkali-halide compound series scintillation materials, such as CsI:Tl (thallium-doped cesium iodide) and CsI:Na (sodium-doped ...

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Problems solved by technology

However, these scintillator materials are prone to deliquescence, slow luminous decay, and poor radiation resistance, and most of them require the highly toxic luminescent dopant Tl (thallium)

Lu discovered in the 1990s 2 SiO 5 :Ce (cerium-doped lutetium silicate) crystal also has a fairly high light output, fast luminous attenuation, and strong radiation resistance, but the raw material of the crystal is expensive, and the high melting point makes the production cost high, so the price is expensive, and the luminous ion Ce In the matrix crystal, it will occupy two different lattice positions, which are prone to uneven distribution and reduce the energy resolution. At the same time, the radioactive isotope of Lu will produce background radiation, which is also a disadvantage.

1999LaCl 3 : Ce (cerium-doped lanthanum chloride) and LaBr 3 The discovery of :Ce (cerium-doped lanthanum bromide) scintillation crystals is the most important breakthrough in the field of scintillation materials in recent years. and the cost of making detectors is very high

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