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Determination method of plutonium age in trace plutonium sample

A measurement method and sample technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of poor repeatability of weapon-grade plutonium age results, cumbersome sample processing process, etc., and achieve short sample analysis time , good background control and high method accuracy

Active Publication Date: 2012-07-04
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

In Journal of Radioanalytical and Nuclear Chemistry, Vol.272, No.1 (2007) 45-51, U.Nygren et al. used inductively coupled plasma mass spectrometry to measure the plutonium age of plutonium standard samples, and the sample processing process is relatively cumbersome , the age results for weapons-grade plutonium are not very reproducible

Method used

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  • Determination method of plutonium age in trace plutonium sample
  • Determination method of plutonium age in trace plutonium sample
  • Determination method of plutonium age in trace plutonium sample

Examples

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Embodiment 1

[0016] This embodiment implements according to the following steps:

[0017] Step 1, weigh the plutonium concentration to be 107ng·g -1 The plutonium sample solution 0.0386g, adding concentration is 7.285pg·g -1 of 233 U diluent 0.0821g, the concentration is 1.0409ng·g -1 of 242 Pu diluent 0.2772g, and 1mL 6mol L -1 HNO 3 , add 1mL of 6mol·L after heating and evaporating to dryness -1 HNO 3 , and then evaporated to dryness.

[0018] Step 2, add 0.5mL 6mol L -1 HNO 3 3mol·L has been used -1 HNO 3 Equilibrated TEVA resin column.

[0019] Step 3, use 7mL 3mol L -1 HNO 3 After rinsing and collecting the U fraction, use 6mL 0.15mol·L -1 Nitric acid-0.025mol·L -1 The oxalic acid solution was washed and collected as the Pu component. Evaporate the collected U fraction to dryness and wash with 1mL 2% HNO 3 Dissolved for MC-ICP-MS analysis.

[0020] Step 4, use multi-receiver inductively coupled plasma mass spectrometry to measure Pu components and U components respe...

Embodiment 2

[0028] The measurement steps and samples are the same as in Example 1, except for Step 3. Step 3 of the present embodiment is as follows:

[0029] Step 3, use 6mL 4mol·L -1 HNO 3 After rinsing and collecting the U fraction, use 8mL 0.1mol·L -1 Nitric acid-0.01mol·L -1 The oxalic acid solution was washed and collected as the Pu component. Evaporate the collected U fraction to dryness and wash with 1mL 2% HNO 3 Dissolved for MC-ICP-MS analysis.

[0030] The plutonium age was determined to be 21.74 years.

Embodiment 3

[0032] The measurement steps and samples are the same as in Example 1, except for Step 3. Step 3 of the present embodiment is as follows:

[0033] Step 3, use 9mL 2mol·L -1 HNO 3 After rinsing and collecting the U fraction, use 5mL 0.5mol·L -1 Nitric acid-0.10mol·L -1 The oxalic acid solution was washed and collected as the Pu component. Evaporate the collected U fraction to dryness and wash with 1mL 2% HNO 3 Dissolved for MC-ICP-MS analysis.

[0034] The plutonium age was determined to be 22.03 years.

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Abstract

The invention discloses a determination method of plutonium age in a trace plutonium sample. The method comprises the following steps of: adding plutonium and the isotopic diluents of daughter uranium thereof, namely, <242> Pu and <233> U, in the sample; adding concentrated nitric acid for heating and price adjustment; and then loading a TEVA resin column, using a chemical separation method to respectively obtain a Pu component and a U component, and using a multi-receiving inductive coupling plasma mass spectrometry to measure the Pu component and the Am component respectively to obtain the values of <240>Pu / <242>Pu and <236>U / <233>U . According to the amount of the added diluents, the value of <240>Pu / <236>U is calculated and substituted into the age-calculating formula to obtain the age of plutonium. The deviation between the age measured by the method and the reference value is within 5%.

Description

technical field [0001] The invention belongs to the technical field of radioisotope measurement, in particular to the detection technology of trace plutonium age. Background technique [0002] In the field of nuclear forensics and verification, there is a need to detect the age properties of trace plutonium. Scholars at home and abroad mainly use gamma spectrometer to determine the age of plutonium. The measurement object of this method is plutonium material, and it is generally believed that the sample size needs to be at least 100mg, and there are certain requirements for the shape of the sample. For smaller samples, due to the limitation of the detection limit of the instrument, the deviation of the plutonium age measured by the gamma spectrometer is relatively large, and the required measurement time is also relatively long. In Radiochim.Acta 96, (2008) 327-331, Zhang Haitao et al. developed a method for measuring the age of plutonium material by α spectrum combined wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
Inventor 陈彦常志远赵永刚张继龙
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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