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Measurement and determination method for age of uranium sample

A determination method and sample technology, applied in the field of radiochemical analysis, can solve the problems of cumbersome operation, heavy workload, long separation process, etc., and achieve the effect of avoiding uncertainty and easy operation.

Inactive Publication Date: 2016-03-23
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, the traditional radiochemical method has a long separation process, cumbersome operation, and a large workload; and the detection efficiency of the gamma spectrometer and alpha spectrometer used must be calibrated. In addition to the use of many expensive radioactive standard substances, the analysis The result has a large uncertainty

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  • Measurement and determination method for age of uranium sample

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 Shown, be the mensuration method of uranium sample age of the present invention, this method comprises the steps:

[0025] (1) Dissolution of uranium samples. Take an appropriate amount of enriched uranium or depleted uranium samples (the uranium content is generally not more than 1g, 234 U content is generally not less than 5.0×10 3 Bq), dissolved in 10mL8mol / L nitric acid;

[0026] (2) In the solution 234 Measurement of Th. Weigh an appropriate amount of solution to prepare a flat source, and a high-purity germanium gamma spectrometer measures the 234 Th;

[0027] (3) In the solution 234 Measurement of U. Weigh about 0.1mL of the solution, dilute it with an appropriate amount of 0.01mol / L nitric acid, and weigh it again; weigh an appropriate amount of the diluted solution (volume not gr...

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Abstract

The invention relates to a measurement and determination method for an age of a uranium sample. The method comprises: dissolution of a proper number of uranium samples is carried out; 234Th in a dissolving solution is measured; a 234U in the dissolving solution is measured; radiochemical separation is carried out on thorium in the dissolving solution; the 234Th and the 234U in the separated product are measured respectively; and then the age of the uranium is calculated based on the known Bateman equation and the radioactive decay rule. With the method, the operation flow is simplified; the employed alpha spectrometer and beta spectrometer do not need detection efficiency scale; the uncertainty of the analysis result due to the detection efficiency scale of the alpha spectrometer and beta spectrometer can be avoided theoretically; and during the separation and measurement processes, no extra radioactive tracer is required.

Description

technical field [0001] The invention belongs to the field of radiochemical analysis, in particular to a method for measuring the age of uranium samples, which is suitable for enriched uranium samples and depleted uranium samples. Background technique [0002] The age of a uranium sample refers to the time interval from its last enrichment or chemical separation to the time of measurement. It is a dynamic fingerprint of nuclear materials and one of the important bases for international nuclear safeguards to trace or verify its source. Whether enriched uranium is produced by diffusion or centrifugation, the gaseous UF 6 As raw material, the product is also UF 6 state. UF 6 The triple point temperature is low, and it vaporizes at about 57°C. The fluoride vaporization temperature of elements such as uranium decay daughters Pa and Th are relatively high, such as ThF 4 The boiling point is 1782°C, PaF 4 and PaF 5 The boiling point is also higher than 500 ℃. Therefore, afte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/36
CPCG01T1/36
Inventor 杨素亮丁有钱梁小虎孙宏清马鹏
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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