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Cerium-ion activated flashing light-emitting material for X-ray detection and method for preparing the same

A scintillation luminescence and X-ray technology, applied in luminescent materials, chemical instruments and methods, etc., to achieve the effects of high light yield, simple preparation process and easy control of conditions

Inactive Publication Date: 2010-10-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant report on the use of alkaline earth metal chloroaluminates doped with trivalent cerium ions as scintillation materials.

Method used

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  • Cerium-ion activated flashing light-emitting material for X-ray detection and method for preparing the same
  • Cerium-ion activated flashing light-emitting material for X-ray detection and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh anhydrous sodium carbonate (Na 2 CO 3 ) 0.0021g, cerium oxide (CeO 2 ) 0.0069g, aluminum oxide (Al 2 o 3 ) 0.4078g, strontium carbonate (SrCO 3 ) 1.1692g, strontium chloride (SrCl 2 ·6H 2 O) 1.0665g, ground and mixed in a mortar, moved to alumina crucible, 5%H 2 -95%N 2 Calcined at 1000°C for 5 hours under atmosphere. Cooling and grinding, X-ray powder diffraction results of the sample and Sr 3 Al 2 o 5 Cl 2 The standard card (JCPDS no80-0564) is consistent, that is, the composition formula is Sr 2.98 Ce 0.01 Na 0.01 Al 2 o 5 Cl 2 powder scintillation material. When the scintillation material is excited at 340nm, its fluorescence wavelength is between 350nm and 600nm, its strongest emission peak is about 440nm, and the corresponding fluorescence lifetime is 33.8 nanoseconds. Compare the sample with the reference sample BaF 2 Test comparisons under the same conditions, such as figure 1 shown. Calculated sample Sr 2.98 Ce 0.01 Na 0.01 Al 2 ...

Embodiment 2

[0015] This embodiment is basically the same as Embodiment 1, the difference is that Ce is increased 3+ doping content. Weigh anhydrous sodium carbonate (Na 2 CO 3 ) 0.0212g, cerium oxide (CeO 2 ) 0.0688g, aluminum oxide (Al 2 o 3 ) 0.4078g, strontium carbonate (SrCO 3 ) 1.0629g, strontium chloride (SrCl 2 ·6H 2 O) 1.0665g, ground and mixed in a mortar, moved to alumina crucible, 5%H 2 -95%N 2Calcined at 1000°C for 5 hours under atmosphere. Cool and grind to obtain powder scintillation material.

Embodiment 3

[0017] This embodiment is basically the same as Embodiments 1 and 2, the difference is that Ce is further increased 3+ doping content. Weigh anhydrous sodium carbonate (Na 2 CO 3 ) 0.0636g, cerium oxide (CeO 2 ) 0.2065g, aluminum oxide (Al 2 o 3 ) 0.4078g, strontium carbonate (SrCO 3 ) 0.8267g, strontium chloride (SrCl 2 ·6H 2 O) 1.0665g, ground and mixed in a mortar, moved to alumina crucible, 5%H 2 -95%N 2 Calcined at 1000°C for 5 hours under atmosphere. Cool and grind to obtain powder scintillation material.

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Abstract

The invention discloses cerium-ion activated flashing light-emitting material for X-ray detection and a method for preparing the same. The cerium-ion activated flashing light-emitting material has the chemical formula of M3-2xCexM'xAl2O5Cl2, wherein the M is one or more components comprising Sr, Ca and Ba, the M' is one or more components comprising Li, Na, K, Rb and Cs, and the x is molar weight of the Ce-displaced M and is more than 0 and less than or equal to 0.5. The cerium-ion activated flashing light-emitting material has the light yield of three times or more higher than the commercialBaF2 under the activation of the X-ray, short fluorescence decay time of 10-40 ns and good physicochemical properties and flashing and light emitting properties, is stable, can not deliquesce easily in the air and can emit the fluorescent wave with the length of 350-600 nm and the highest peak of 440 nm. The cerium-ion activated flashing light-emitting material is synthesized with the traditional high-temperature solid-phase method and the simple process safely and conveniently in the controllable condition, and the method for preparing the cerium-ion activated flashing light-emitting material is easy to operate.

Description

technical field [0001] The invention relates to a scintillation luminescent material, in particular to a scintillation luminescent material activated by trivalent cerium ions for X-ray detection and a preparation method thereof. Background technique [0002] The scintillation luminescent material is transparent in the scintillation wavelength range, and it responds to incident radiation by emitting a light pulse, that is, after being irradiated by X-rays, gamma-rays and other high-energy rays, it absorbs part of the energy and converts it into visible light. The more photons the scintillation material emits after absorbing specific high-energy radiation, the better, so that the accuracy of the detection signal is improved. The fluorescence decay time of the scintillation material is kept as short as possible in order to increase the operating frequency of the detector. If it is used in the field of nuclear medicine imaging, it can greatly reduce the inspection time, improve...

Claims

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Application Information

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IPC IPC(8): C09K11/86
Inventor 梁宏斌陈万平苏锵
Owner SUN YAT SEN UNIV
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