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Powder metallurgy technique for preparing 147Pm high activity source

A technology of powder metallurgy and high activity, which is applied in the field of powder metallurgy for the preparation of 147Pm high-activity sources. It can solve the problems of unsatisfactory, large amount of raw materials, and difficulty in preparing high-activity sources, so as to reduce the dosage and meet the use requirements. , Improve the effect of the source process

Inactive Publication Date: 2008-09-17
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the early days, domestic paper thickness measurements were all prepared by ceramic technology. 147 Pm radiation source, due to the thickness of the source window and self-absorption problems such as ceramic glaze, it is difficult to prepare a high-activity source, and the activity is generally 150mCi; if it is more than 300mCi, it must be invested more than 3 times 147 Pm raw materials, so the amount of raw materials is large, but the firmness
In 1998, the powder metallurgy process was used to develop 280mCi 147 Pm radiation source, but as the measurement accuracy becomes higher and higher, the source activity is required to be larger and larger. The source prepared by this powder metallurgy process cannot meet the requirements of domestic and foreign production lines.

Method used

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  • Powder metallurgy technique for preparing 147Pm high activity source

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Devices used in this embodiment: hydraulic press, ceramic crucible, blanking device (one set of φ5, φ34.5, φ20), rolling mill, muffle furnace, activity meter RM-905a type, infrared lamp, electronic balance, forming mold.

[0014] Weigh 280 mg of promethium oxide and 1.4 g of gold powder, mix them into a ceramic crucible, add 10 ml of ethanol, and stir with a glass rod for about 15 minutes to make them evenly mixed, let stand for 20 minutes, move the ceramic crucible to an infrared lamp and bake for about 15 minutes. Thirty minutes, pour the dried powder into the molding mold, at 100kg / cm 2 Pressed under pressure into active blanks. Put the active billet into a 5mm thick silver mold (groove depth is 2.5mm), and cover it with 100μm thick gold foil, heat it in a muffle furnace, remove moisture at a constant temperature, and then heat it to 790°C for 3 hours, and heat it at 100kg / cm2 while it is hot Compacted under a certain pressure, and then rolled into a 400 to 500 mm p...

Embodiment 2

[0016] Weigh 140 mg of promethium oxide and 1.4 g of gold powder, mix them into a ceramic crucible, add 10 ml of ethanol, and stir with a glass rod for about 15 minutes to make them evenly mixed, let stand for 20 minutes, move the ceramic crucible to an infrared lamp and bake for about 15 minutes. Thirty minutes, pour the dried powder into the molding mold, at 100kg / cm 2 Pressed under pressure into active blanks. Put the active billet into a 5mm thick silver mold (groove depth is 2.5mm), cover it with 100μm thick gold foil, heat it in a muffle furnace, remove moisture at a constant temperature, and then heat it to 800°C for 4 hours. 2 Compacted under a certain pressure, and then rolled into a 400 to 500 mm primary active belt (unit specific activity is about 1.0Ci / cm) on a rolling mill. The Φ5mm source core laminated film is placed between the Φ7mm thick 100μm Au foil and the Ag mold, and it is pressed at about 800°C for 17 minutes after annealing, and then rolled, cut, and p...

Embodiment 3

[0018] Weigh 93 mg of promethium oxide and 1.4 g of gold powder, mix them into a ceramic crucible, add 10 ml of ethanol, and stir with a glass rod for about 15 minutes to make them evenly mixed, let stand for 20 minutes, move the ceramic crucible to an infrared lamp and bake for about 15 minutes. Thirty minutes, pour the dried powder into the molding mold, at 100kg / cm 2 Pressed under pressure into active blanks. Put the active billet into a 5mm thick silver mold (groove depth is 2.5mm), cover it with 100μm thick gold foil, heat it in a muffle furnace, remove moisture at a constant temperature, and then heat it to 810°C for 5 hours, and heat it at 100kg / cm2 while it is hot 2 Compacted under a certain pressure, and then rolled into a 400 to 500 mm primary active belt (unit specific activity is about 1.0Ci / cm) on a rolling mill. The Φ5mm source-core laminated film is placed between the Φ7mm thick 100μm Au foil and the Ag mold, and then pressed at about 810°C for 20 minutes after...

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Abstract

The invention provides a preparation method for making the improved powder metallurgy which increases the raw material consumption, lowers the self absorption of an active absorption layer, and makes a radioactive source to reach the maximum utilization ratio. The process of the preparation method comprises the following steps: (1) mixing up and stirring, (2) baking, (3) molding, (4) compounding, (5) agglomerating, maintaining at a constant temperature, and rolling, (6) compounding, annealing, and rolling. In the steps, mixing up (1) means promethium oxide is mixed and stirred up with the gold powder by mass ratio of from 1: 5 to 1:15, step (5) of agglomerating requires the agglomerating temperature between 790 and 810 degree centigrade and keeps at a constant temperature for 3 to 5 hours and then rolling.

Description

technical field [0001] The invention relates to the field of metal powder manufacturing, in particular to a preparation 147 Powder metallurgy process of Pm high activity source. Background technique [0002] As industry, agriculture, and living standards have higher and higher requirements for the quality of paper and plastic films, the scale of their production lines is also increasing. Therefore, it is required to measure the production process online and quickly measure the product. The thickness of the machine can be corrected at any time to ensure the production of qualified products. [0003] At present, there are several methods of thickness measurement, such as infrared, ultrasonic, and β-rays, but for the thickness of paper and plastic films, the method of measuring the thickness of paper and plastic films with β-rays is unique and irreplaceable. [0004] The normal operation of the β-ray thickness gauge is one of the necessary conditions to ensure stable and reli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/00
Inventor 孙玉华简利民冯嘉敏许荣旺李士英平杰红段利民
Owner CHINA INSTITUTE OF ATOMIC ENERGY