On May 19th, the “Rare Earth Doped Lithium Phosphate Photoluminescence Induced Luminescent Material and Its Preparation Method†completed by the scientific research personnel of Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences was authorized by the national invention patent (patent number: ZL 201210402439.8).
As the core of the light-excited luminescent radiation dose test method, the performance and characteristics of the light-excited luminescent material determine the direction and application of this technology. In the study of light-excited luminescent materials, rare-earth-doped alkaline-earth metal sulphides are the materials that were first proposed when the light-excited luminescence technique was used as a potential radiation dose measurement method, and its application range was extensive. However, this material is not stable in air when used, and is easily oxidized, resulting in a drastic decrease in the photo-excitation luminescence property of the material, resulting in a large radiation dose measurement error.
Researchers at Xinjiang Institute of Physical and Chemical Research have developed a rare earth doped lithium magnesium phosphate photoluminescent material for the above problems. The materials are lithium hydroxide, magnesium nitrate, ammonium dihydrogen phosphate, antimony oxide, and antimony oxide. Boric acid is made at high temperature and its chemical formula is LiMgPO4:Tb,Sm,B. The invention greatly reduces the preparation temperature of the material by adding the auxiliary solvent, improves the sensitivity of the material to the radiation particles, has small environmental pollution, low cost and high stability; at the same time, the addition of cerium oxide improves the luminescence performance of the rare earth cerium ion. The photoexcitation excitation time of the material is effectively shortened, the linear range of the measurable radiation dose response is 0.1-216 Gy, the sensitivity is 3 times that of LiMgPO4:Tb, B, and the excitation time of light excitation is within 4 seconds, which can be applied to the environment, Real-time online measurement of medical and personal radiation doses.
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