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Trivalence cerium iron activated scintilla luminescent material for X-ray detection and preparation method thereof

A technology of scintillating luminescence and trivalent cerium, which is applied to luminescent materials, material analysis by using wave/particle radiation, analysis of materials, etc., to achieve the effects of simple preparation process, good physical and chemical properties, and high light yield

Inactive Publication Date: 2007-10-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Trivalence cerium iron activated scintilla luminescent material for X-ray detection and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh anhydrous lithium carbonate (Li 2 CO 3 )0.2217g, gadolinium oxide (Gd 2 o 3 ) 1.0766g, diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ] 3 .1694g, ceria (CeO 2 ) 0.0103g, fully grind in an agate mortar, mix evenly, put the obtained powder mixture into a small alumina crucible with a size of 25mm×25mm, and then put this crucible into a large alumina crucible First, a layer of carbon particles is spread on the bottom layer of the large crucible, and an alumina cover equal to the outer diameter of the large crucible is pressed on to ensure that the large crucible is tightly covered. Then put it into a heating furnace, raise the temperature to 700°C at a heating rate of 2°C / min, keep the temperature in a CO reducing atmosphere for 40 hours, then cool it down to room temperature naturally, take it out, and grind the obtained powder product in an agate mortar. The product was tested by powder XRD and confirmed to have LiEu(PO 3 ) 4 The structure type of LiGd(P...

Embodiment 2

[0022] Weigh anhydrous sodium carbonate (Na 2CO 3 ) 0.3180g, gadolinium oxide (Gd 2 o 3 )0.9788g, ammonium dihydrogen phosphate [NH 4 h 2 PO 4 ] 2.7607g, cerium carbonate octahydrate [Ce 2 (CO 3 ) 3 ·8H 2 O] 0.1033g, other conditions are with embodiment 1. The obtained powder sample was confirmed to be NaGd(PO 3 ) 4 crystalline phase. Excited by X-rays, the fluorescence emission wavelength is in the range of 300-375nm. Using the integrated intensity and the BaF measured under the same conditions 2 Comparing the spectral integration intensity of the samples, the light yield of the obtained product under X-ray excitation is 21,000±1,500photons / MeV, which is the same as that of BaF excited by X-rays under the same conditions. 2 A light yield of 225.8% was obtained. Excited by ultraviolet light with a wavelength of 297nm, the lifetime of fluorescence at the main emission peak of 332nm is 12.4 nanoseconds. The sample NaGd(PO 3 ) 4 : Ce 3+ with reference sample Ba...

Embodiment 3

[0024] Weigh anhydrous sodium carbonate (Na 2 CO 3 ) 0.3180g, gadolinium oxide (Gd 2 o 3 ) 1.0848g, ammonium dihydrogen phosphate [NH 4 h 2 PO 4 ] 2.7607g, cerium oxide (CeO 2 ) 0.0026g, other conditions are with embodiment 1. The obtained powder sample was confirmed to be NaGd(PO 3 ) 4 crystalline phase. The obtained powder sample emits fluorescence with a wavelength in the range of 300-375 nm under the excitation of ultraviolet light with a wavelength of 273 nm.

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Abstract

The invention discloses a method preparing for a scintillating luminous material for a trivalent cerium ion activating X-ray detecting with chemistry composition formula at M(RE1-xCex)(PO3)4( M is one of Li, Na, Rb, Cs; RE is a trivalent rare earth ion of La, Gd, Lu; x is between 0. 50 and 0. 0025), which is characterized by the following: increasing 2 times than commercial BaF2 in the X-ray; fading the time of the fluorescent light at the range of 10-25 billiseconds; surviving steadily in the air; proceeding no air slaking; shining the wave length of the fluorescent light at 300-400 nanometers; coupling with the electron-multiplier phototube; providing with a good physicochemical property and a good flicker property. The invention provides a simple technique, which operates easily and safely.

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] After being irradiated by X-rays, γ-rays and other high-energy rays, scintillation materials absorb part of the energy and convert it into near-ultraviolet light or visible light. The more photons the scintillation material emits after absorbing specific high-energy radiation, the better, which can improve the accuracy of the detection signal and minimize the radiation damage to the human body. Another important requirement for scintillating luminescent materials is that the decay lifetime of the emitted fluorescence is as short as possible, so that radiation excitation events with very short time intervals can be effectively resolved and the accuracy of high-energy ray detection can be improved. [0003] Due to the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81G01N23/223
Inventor 梁宏斌钟玖平苏锵
Owner SUN YAT SEN UNIV