Europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and preparation method thereof

A light-stimulated luminescence, lithium magnesium phosphate technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of unsuitable radiation dose test system, unstable material thermoluminescence performance, easy distortion of test signal, etc., and achieve improvement Radiation dose response linear range, the effect of improving photo-stimulated luminescence performance and improving thermoluminescence performance

Inactive Publication Date: 2013-07-10
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since LiMgPO 4 : The annealing time of Tb, B light-stimulated luminescent materials is long. After 90 seconds of excitation light annealing, the light-stimulated luminescence intensity signal is reduced to less than 10% of the initial intensity, and the thermoluminescence performance of the material is unstable. The test signal is easily distorted under
So LiMgPO 4 : Tb, B are not suitable for real-time online radiation dose test system

Method used

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  • Europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and preparation method thereof
  • Europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and preparation method thereof
  • Europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. In an agate mortar, mix lithium hydroxide: magnesium nitrate: ammonium dihydrogen phosphate: boric acid: europium oxide: samarium oxide=1:0.91:0.87:0.0065:0.0035:0.0030 by molar ratio, grind for 1h, and pack Porcelain crucibles made of alumina are placed in a high-temperature sintering furnace and heated to a temperature of 250-℃ for 2 hours, then heated to a temperature of 500-℃ for 2 hours, and finally at a reaction temperature of 900-℃ for 25 hours. sintering;

[0027] b. After the reaction, cool the alumina crucible to room temperature, take out the raw materials in the crucible, and you can get europium samarium doped lithium magnesium phosphate LiMgPO 4 : Eu, Sm, B light-excited luminescent materials;

[0028] Test and analyze with TL / OSL-DA-15 optical luminescence / thermoluminescence dual-purpose readout instrument, LiMgPO 4 : Eu, Sm, B radiation dose response linear range is 0.1-300Gy, the sensitivity is LiMgPO 4 : Tb, 3 times of B, the main peak of thermol...

Embodiment 2

[0030] a. In an agate mortar, mix lithium hydroxide: magnesium nitrate: ammonium dihydrogen phosphate: boric acid: europium oxide: samarium oxide = 1:0.91:0.87:0.0073:0.004:0.0038 in molar ratio, grind for 1h, and pack Porcelain crucibles made of alumina are placed in a high-temperature sintering furnace and heated to a temperature of 250-℃ for 2 hours, then heated to a temperature of 500-℃ for 2 hours, and finally the reaction temperature is 950-℃, and the reaction time is 18 hours. sintering;

[0031] b. After the reaction, cool the alumina crucible to room temperature, take out the raw materials in the crucible, and you can get europium samarium doped lithium magnesium phosphate LiMgPO 4 : Eu, Sm, B light-excited luminescent materials;

[0032] Test and analyze with TL / OSL-DA-15 optical luminescence / thermoluminescence dual-purpose readout instrument, LiMgPO 4 : The radiation dose response of Eu, Sm, B is linear in the range of 0.1-400 Gy, and the sensitivity is LiMgPO 4 ...

Embodiment 3

[0034] a. In an agate mortar, mix lithium hydroxide: magnesium nitrate: ammonium dihydrogen phosphate: boric acid: europium oxide: samarium oxide=1:0.91:0.87:0.008:0.0043:0.0047 in molar ratio, grind for 1h, and pack Porcelain crucibles made of alumina are placed in a high-temperature sintering furnace and heated to a temperature of 250-℃ for 2 hours, then heated to a temperature of 500-℃ for 2 hours, and finally at a reaction temperature of 950-℃ for 15 hours. sintering;

[0035] b. After the reaction, cool the alumina crucible to room temperature, take out the raw materials in the crucible, and you can get europium samarium doped lithium magnesium phosphate LiMgPO 4 : Eu, Sm, B light-excited luminescent materials;

[0036] Test and analyze with TL / OSL-DA-15 optical luminescence / thermoluminescence dual-purpose readout instrument and other equipment, LiMgPO 4 : The radiation dose response of Eu, Sm, and B is linear in the range of 0.1-540 Gy, and the sensitivity is LiMgPO 4...

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Abstract

The invention relates to a europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and a preparation method thereof. The chemical formula of the material is LiMgPO4: Eu, Sm, B, and the specific preparation method comprises the following steps of: mixing and grinding raw materials, namely lithium hydroxide, magnesium nitrate, ammonium dihydrogen phosphate, boric oxide, europium oxide and samarium oxide, loading into a porcelain crucible made of an aluminum oxide material, placing into a high-temperature sintering furnace for performing sectional constant-temperature sintering, and further cooling the aluminum oxide crucible to room temperature to obtain the europium and samarium-doped lithium magnesium phosphate LiMgPO4: Eu, Sm, B photostimulated luminescent material. The material is of an olivine type structure, the space group is Pnma, the lattice constants are as follows: a=10.147., b=5.909. and c=4.692., and the doping of europium and samarium does not change the basic structure of the LiMgPO4 material; and the thermoluminescence performance of the material is greatly upgraded, the sensitivity and the stability in storage of radiation dose information are effectively improved, the addition of the samarium oxide upgrades the luminescence performance of rare earth europium ions, and the material has low environmental pollution and low cost and can be applied to environments, medicines and offline and real-time online measurement of human body radiation doses.

Description

[0001] technical field [0002] The invention relates to a kind of europium samarium doped lithium magnesium phosphate photoexcitation luminescent material LiMgPO 4 : Eu, Sm and its preparation method. Background technique [0003] The technology of indirect measurement of radiation dose by using the characteristic that the intensity of fluorescence emitted by the light-stimulated luminescent material is proportional to the previously absorbed radiation dose is a new type of radiation dose measurement method that has emerged in recent years. It has high sensitivity and can be measured. With the advantages of wide range and online measurement, it has good application prospects in the fields of nuclear power plants, heavy ion accelerators, electron accelerators, gamma radiation sources, radiation medicine, space radiation dose detection, and dating in archaeological geology. Especially in the field of radiation medicine, the technology of using radionuclides to treat tumors i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70
Inventor 陈朝阳盖敏强范艳伟
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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