a mg 2 sio 4 : The preparation method of tb thermoluminescent dose tablet

A thermoluminescence dose and dose technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as greatly affecting photostability, and achieve the effect of high sensitivity and good chemical stability

Active Publication Date: 2018-02-23
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As early as 1971, Hashizume and others introduced its preparation process and specific properties. In 1975, Jun and Becker's research showed that the thermal stability of this material is also quite good. However, the rare earth doped magnesium silicate material is affected by the preparation process. Large and poor photostability

Method used

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  • a mg <sub>2</sub> sio <sub>4</sub> : The preparation method of tb thermoluminescent dose tablet
  • a mg <sub>2</sub> sio <sub>4</sub> : The preparation method of tb thermoluminescent dose tablet
  • a mg <sub>2</sub> sio <sub>4</sub> : The preparation method of tb thermoluminescent dose tablet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Ingredients: choose Mg(OH) 2 4MgCO 3 ·6H 2 O, SiO 2 , Tb 4 O 7 (purity is 99.9%) as raw material, mixed in a certain proportion;

[0027] (2) Tablet compression: After the raw material is prepared, it is pressed into a tablet with a diameter of about 2cm, and the pressure of the tablet press is set to 10MPa, and it is taken out after holding for 1min;

[0028] (3) Sintering: the pressed sheet is sintered by high temperature solid phase method to obtain Mg 2 SiO 4 : Tb block, heating parameter setting: increase from 50°C to 1650°C at a heating rate of 5°C / min, hold at 1650°C for 1 hour, then cool down to 50°C at a rate of 5°C / min, take out the sample, grind After fine, it is screened with 200 mesh molecular sieves to obtain Mg with a particle size of about 200 meshes. 2 SiO 4 : Tb powder.

[0029] to the Mg 2 SiO 4 : Tb powder was scanned by SEM, and the results are as follows figure 2 shown.

Embodiment 2

[0031] (1) Tabletting: select the Mg prepared in Example 1 2 SiO 4 : Tb powder is used as raw material, and tableting is carried out with an abrasive tool;

[0032] (2) Secondary calcination: Then put the pressed circular sheet into a 25ml alumina crucible for secondary calcination, increase from 50°C to 1400°C at a heating rate of 5°C / min, keep at 1400°C for 2 hours, and then heat at 5°C for 5°C. The rate of °C / min was lowered to room temperature and the crucible was removed to obtain the fired dose tablet.

[0033] The finished product of the obtained dosage tablet is as Figure 4 shown.

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Abstract

The invention provides a preparation method of Mg2SiO4:Tb thermoluminescence dosimeter, comprising: using Mg(OH)2.4MgCO3.6H2O, SiO2 and Tb4O7 as materials, mixing according to a certain chemical ratio, tableting the mixed powder, and sintering at high temperature to obtain Mg2SiO4:Tb block; grinding the block into powder, screening the powder, tableting the powder, and calcining secondarily the formed disc to obtain the calcined dosimeter. The Mg2SiO4:Tb thermoluminescence dosimeter is well responsive to Co60 radiation source, much better than conventional dosage materials, and has thermoluminescence test peak strength that is about 45 times that of LiF: Mg, Cu, P after being exposed to the same dose of Co60 radiation.

Description

technical field [0001] The invention relates to a thermoluminescent material, in particular to a Mg 2 SiO 4 : The preparation method of Tb thermoluminescent dose tablet. Background technique [0002] Thermoluminescence is a phenomenon in which an insulator or semiconductor material absorbs radiation in advance and then heats up to emit light. The radiation dose in a certain area can be measured according to the amount of light emitted. At present, thermoluminescent dosimeters prepared from thermoluminescent materials can be widely used in radiation protection, radiation therapy, environmental monitoring, geological age measurement, archaeology, aerospace and many other fields. [0003] Magnesium silicate is an orthorhombic crystal system with good physical and chemical stability. The rare earth-doped magnesium silicate material has very good thermoluminescence sensitivity, making it one of the candidate materials for thermoluminescence dosimeters. As early as 1971, Hashiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
CPCC09K11/7749
Inventor 王亚芳赵莹崔美娜晋海涛
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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