Preparation method of lead tungstate powder with high scintillation property

A lead tungstate performance technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of inability to achieve high scintillation performance and low light yield of lead tungstate crystals, and achieve excellent scintillation performance, experimental The effect of low equipment requirements and high controllability

Inactive Publication Date: 2011-02-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The present invention provides a tungsten crystal with high scintillation performance in order to solve the problem that the lead tungstate crystals in the prior art cannot be widely used due to low light yield and cannot achieve high scintillation performance due to doping modification and process optimization. Lead acid (PbWO 4 ) powder preparation method to fill the gaps in the prior art and broaden the application fields of lead tungstate crystals, especially to realize the application of lead tungstate crystals in medical imaging such as PET

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  • Preparation method of lead tungstate powder with high scintillation property
  • Preparation method of lead tungstate powder with high scintillation property
  • Preparation method of lead tungstate powder with high scintillation property

Examples

Experimental program
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Embodiment 1

[0039] a) First weigh lead acetate and sodium tungstate according to the stoichiometric ratio, and then use deionized water to prepare the weighed lead acetate and sodium tungstate respectively into lead acetate solution with a concentration of 0.05mol / L and sodium tungstate with a concentration of 0.05mol / L solution;

[0040] b) Stir and heat the lead acetate solution and the sodium tungstate solution, and control the heating temperature at 50-70°C;

[0041] c) adding ammonia water dropwise to adjust the pH value of the sodium tungstate solution to 9;

[0042] d) Pour the lead acetate solution into the separatory funnel, drop it into the sodium tungstate solution at a uniform rate, lead ions and tungstate ions react chemically to form lead tungstate precipitates;

[0043] e) Dry the obtained lead tungstate precipitate at 80°C after repeated filtration and cleaning to obtain lead tungstate grains;

[0044] f) Heat treatment of lead tungstate grains at different temperatures,...

Embodiment 2

[0052] a) First weigh lead acetate and sodium tungstate according to the stoichiometric ratio, and then use deionized water to prepare the weighed lead acetate and sodium tungstate respectively into lead acetate solution with a concentration of 0.05mol / L and sodium tungstate with a concentration of 0.05mol / L solution;

[0053] b) Stir and heat the lead acetate solution and the sodium tungstate solution, and control the heating temperature at 50-70°C;

[0054] c) adding ammonia water dropwise to adjust the pH value of the sodium tungstate solution to 7;

[0055] d) Pour the lead acetate solution into the separatory funnel, drop it into the sodium tungstate solution at a uniform rate, lead ions and tungstate ions react chemically to form lead tungstate precipitates;

[0056] e) Dry the obtained lead tungstate precipitate at 80°C after repeated filtration and cleaning to obtain lead tungstate grains;

[0057] f) heat-treating the lead tungstate grains at 500°C to obtain lead tu...

Embodiment 3

[0059] The difference between this example and Example 2 is "step c) adding ammonia water dropwise to adjust the pH value of the sodium tungstate solution to 11", and the rest of the content is the same as that described in Example 2.

[0060] Figure 7 It is the relationship diagram of the luminous peak position and luminous intensity of the lead tungstate powder prepared at different pH values. It can be seen that the lead tungstate powder prepared under the condition of pH=7 has good scintillation performance, but the performance Slightly lower than the lead tungstate powder prepared under the condition of pH=9; the lead tungstate powder prepared under the condition of pH=11 is basically the same as the lead tungstate powder prepared under the condition of pH=9 The scintillation performance; and with the increase of pH value, the luminescence peak position of the prepared lead tungstate powder will be slightly red-shifted, and the red-shift range is 460-490nm, but it still ...

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Abstract

The invention discloses a preparation method of a lead tungstate powder with high scintillation property, comprising the following specific steps of: a) dropwise adding a water soluble lead salt solution into a water soluble tungstate solution with a pH value being not less than 7 at the uniform velocity so that the coprecipitation chemical reaction is conducted at 30-80 DEG C; b) filtering, washing and drying the obtained lead tungstate precipitation; and c) carrying out thermal treatment on the obtained lead tungstate crystal grains. By the invention, the luminescence peak of the lead tungstate powder body is within the blue light wave band of 450-500nm and belongs to fast luminescence component; the luminescence strength is high and is remarkably improved by about 15 times in comparison with the luminescence strength of the power obtained by grinding lead tungstate crystal grains which grow by a descending method, can reach the luminescence level of the power obtained by grinding of bismuth germanate crystal grains which grow by a descending method and has excellent scintillation property; in addition, the invention has the advantages of simple operation, short reaction time, low requirements on experimental equipment, high controllability and the like, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a lead tungstate (PbWO) with high scintillation performance 4 ) powder preparation method, which belongs to the technical field of scintillation materials. Background technique [0002] Lead Tungstate PbWO 4 (PWO for short) crystal is a new type of scintillation crystal material discovered in the 1990s, which has many superior characteristics, such as high density (8.28g / cm 3 ), short irradiation length (0.89cm), fast luminous decay (<50ns), high irradiation hardness (>10 6 rad), stable physical and chemical properties and low cost, etc., are widely used in high-energy physics, such as being selected as the compact muon solenoid detector (CMS) for the construction of the Large Hadron Collider (LHC) at the European Center for Nuclear Research (CERN) ) project's electromagnetic calorimeter detection material and large ion collider (ALICE) scintillator, etc. Especially with the bismuth germanate (Bi 4 Ge 3 o 12 ) crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C09K11/68
Inventor 王红赵景泰胡关钦陈昊鸿张志军
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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