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A kind of preparation method of pet with low thorium, low uranium lutetium oxide
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A technology of lutetium oxide and feed liquid, applied in chemical instruments and methods, lanthanide oxides/hydroxides, rare earth metal oxides/hydroxides, etc., can solve problems such as the influence of image signal-to-noise ratio, and achieve product The effect of high quality, short process and less equipment
Active Publication Date: 2020-05-01
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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Abstract
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Problems solved by technology
In a PET system, background events caused by spontaneous emission of scintillation crystals, untrue random coincidence events, and background noise caused by scattered coincidence events may have a great impact on the image signal-to-noise ratio
Method used
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Embodiment 1
[0016] The invention discloses a method for preparing PET with low thorium and low uranium lutetium oxide, which comprises the following steps:
[0017] (1) Material liquid preparation: LuCl with a concentration of 1.3mol / L 3 solution, where ThO 2 The content is 20mg / L, UO 3 The content is 20mg / L, LuCl 3 The volume of the solution is 0.5m 3 , then add concentrated nitric acid with a volume of 166 L and a concentration of 14 mol / L, and mix uniformly to form a feed liquid. The concentration of nitrate in the feed liquid is 3.49 mol / L.
[0018] (2) Preparation of extractant: the extractant is made by mixing TBP+kerosene at a volume ratio of 2:3, and the volume of the extractant is 0.7m 3 , in which the content of TBP (tributyl phosphate) is 40%.
[0019] (3) Extraction and removal of thorium and uranium: 0.666 m 3 , extractant 0.7 m 3 join 3m 3 In a glass fiber reinforced plastic stirring pot, mix and stir for 1 hour, let it stand for clarification to separate the feed l...
Embodiment 2
[0029] The invention discloses a method for preparing PET with low thorium and low uranium lutetium oxide, which comprises the following steps:
[0030] (1) Material liquid preparation: LuCl with a concentration of 0.7mol / L 3 solution, where ThO 2 The content is 13mg / L, UO 3 The content is 13mg / L, LuCl 3 The volume of the solution is 0.8m 3 , then add concentrated nitric acid with a volume of 134 L and a concentration of 14 mol / L, mix uniformly to form a feed liquid, and the nitrate concentration in the feed liquid is 2.0 mol / L.
[0031] (2) Preparation of extractant: the extractant is made by mixing TBP+kerosene at a volume ratio of 1:4, and the volume of the extractant is 1.0m 3 , in which the content of TBP (tributyl phosphate) is 20%.
[0032] (3) Extraction and removal of thorium and uranium: Add the above-mentioned feed liquid and extraction agent to 3m 3 In a glass fiber reinforced plastic stirring pot, mix and stir for 1 hour, let it stand for clarification to sep...
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Abstract
The invention discloses a method for preparing PET with low thorium and low uranium lutetium oxide, which comprises the following steps: (1) preparation of feed liquid: LuCl with a concentration of 0.1-1.3mol / L 3 solution, where ThO 2 The content is 5‑20mg / L, UO 3 The content is 5-20mg / L, the LuCl 3 Solution and concentrated nitric acid with a concentration of 14mol / L are mixed evenly to form a feed liquid, and the concentration of nitrate in the feed liquid is 2.0-3.5mol / L; (2) extraction agent preparation: the extraction agent is prepared by mixing TBP and kerosene, Among them, the content of TBP (tributyl phosphate) is 20%; (3) Extraction and removal of thorium and uranium: After mixing and stirring the above-mentioned feed liquid and extractant, let it stand for clarification to separate the feed liquid from the extractant, and the separated feed liquid It is a qualified lutetium feed solution with low thorium and low uranium. The overall process of the invention is simple, and the obtained lutetium oxide product is of good quality.
Description
technical field [0001] The invention belongs to the technical field of rare earth materials, and relates to a method for preparing low-thorium and low-uranium lutetium oxide for PET, which is a method for preparing rare earth oxides. Background technique [0002] Positron Emission Computed Tomography (PET) system is widely used in the diagnosis and differential diagnosis of various diseases, disease judgment, curative effect evaluation, organ function research and new drug development, etc. In the PET system, background events caused by spontaneous emission of scintillation crystals, unreal random coincidence events and background noise caused by scattered coincidence events may have a great impact on the image signal-to-noise ratio. Therefore, the PET system usually adopts the following methods to ensure the signal-to-noise ratio of the image: reducing spontaneous emission and improving the energy resolution of the system. Among these methods, improving the quality index o...
Claims
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/224A61B6/03
CPCA61B6/037C01P2006/80C01F17/206
Inventor 郑仙荣钟可祥张榕贵李来超
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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