Measurement method for uranium product production time

A measurement method and technology of production time, applied in the field of measurement of production time of uranium products, to achieve the effects of easy acquisition, long life and short analysis time

Inactive Publication Date: 2017-06-20
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the difficult to obtain 229 Under the condition of Th isotope diluent, it cannot pass the measurement 234 U / 230 The problem of measuring the production time of uranium products is completed by means of Th atomic number ratio, and the invention provides a method for measuring the production time of uranium products

Method used

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  • Measurement method for uranium product production time

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Effect test

Embodiment 1

[0032] Weigh about 3.4mg U 3 o 8 (CRM U010 standard substance) powder, add 10mL 6M HNO 3 , heated to 90°C to dissolve overnight to obtain a well-dissolved mother solution to be tested. At the same time, prepare a blank process sample with the same process.

[0033] Weigh 1mL of the mother liquor and dilute it 100 times step by step to obtain 20mL of the dilution. Weigh four 3mL dilutions, add 0.1mL 2.5087(46)×10- 7 g / g 233 U Thinner. At the same time, weigh 3mL blank process diluted sample, add 0.1mL2.5087(46)×10- 7 g / g 233 U Thinner. According to MC-ICP-MS measurement of the 234 U / 233 U value and join 233 The amount of U diluent can be calculated by the isotope dilution method in the mother liquor 234 U content.

[0034] Take 200μL 232 Th standard solution was diluted 20000 times step by step to obtain 10mL 4.121(35)×10- 8 g / g 232 Th thinner. Weigh four 2mL mother liquors and one 2mL corresponding blank process sample, and add about 2mL of diluted 232 Th th...

Embodiment 2

[0037] Weigh about 2.5mg of U 3 o 8 (CRM U850 standard substance) powder, add 10mL 6M HNO 3 , heated to 90°C to dissolve overnight to obtain a well-dissolved mother solution to be tested. At the same time, prepare a blank process sample with the same process.

[0038] Weigh 0.2mL of the mother liquor and dilute it 25 times step by step to obtain 5mL of the dilution. Weigh four 1mL dilutions, add 4mL 2.573(16)×10 -9 g / g 233 U Thinner. At the same time, weigh 1mL blank process diluted sample, add 4mL2.573(16)×10 -9 g / g 233 U Thinner. According to MC-ICP-MS measurement of the 234 U / 233 U value and join 233 The amount of U diluent can be calculated by the isotope dilution method in the mother liquor 234 U content.

[0039] Take 200μL 232 Th standard solution was diluted 20000 times step by step to obtain 10mL 4.250(36)×10 -8 g / g 232 Th thinner. Weigh four 2mL mother liquors and one 2mL corresponding blank process sample, and add about 2mL of diluted 232 Th thinn...

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Abstract

The invention belongs to the field of radioactive substance analysis. In order to solve the problem that the measurement of uranium product production time cannot be finished under a condition that <229>Th isotope diluent is difficult in acquisition, the measurement method comprises the following steps: (1) obtaining a uranium balance sample; (2) calculating the amount of <234>U; (3) adding <232>Th isotope diluent to obtain a thorium balance sample; (4) calculating the amount of <230>Th; (5) calculating a <234>U / <230>Th atom ratio; (6) calculating the uranium product production time. According to the measurement method disclosed by the invention, the <232>Th is used for replacing traditional <229>Th to serve as the isotope diluent. The measurement method has the advantages of simple and easy operation method, high measurement accuracy, short analysis time and the like and is suitable for measuring the uranium product production time under a common laboratory condition, and the isotope diluent can be easily obtained.

Description

technical field [0001] The invention belongs to the field of radioactive material analysis, in particular to a method for measuring the production time of uranium products. Background technique [0002] In the fields of nuclear forensic investigation and arms control verification, it is very important to determine the production time of uranium products (ie, the age of uranium). For example, in nuclear forensic investigations, the production time of uranium products can help trace the source and possible production route of nuclear materials; in arms control verification, the production time of uranium products is an indicator to distinguish old and new nuclear weapons materials. [0003] In fact, the current production time of uranium products is mainly measured by 234 U / 230 Th atomic number ratio to obtain, the main principle is: add to uranium products 229 Th and 233 U isotope diluent, after chemical separation, respectively measure daughter nuclei ( 230 Th) and mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/38
CPCG01N27/62G01N1/38G01N2001/388
Inventor 陈彦赵永刚李力力朱留超
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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