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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: 2009-10-21
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
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  • Application Information

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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

Experimental program
Comparison scheme
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Embodiment 1

[0016] This embodiment is implemented according to the following steps:

[0017] Step 1. Weigh the plutonium concentration to 107ng·g -1 0.0386g of plutonium sample solution with a concentration of 7.285pg·g -1 of 233 U diluent 0.0821g, concentration is 1.0409ng·g -1 of 242 Pu diluent 0.2772g, and 1mL 6mol·L -1 HNO 3 , Add 1mL 6mol·L after heating and steaming to dryness -1 HNO 3 , And then steam dry.

[0018] Step 2. Add 0.5mL 6mol·L -1 HNO 3 3mol·L used on the -1 HNO 3 Balanced TEVA resin column.

[0019] Step 3. Use 7mL 3mol·L -1 HNO 3 After eluting and collecting as U component, use 6mL 0.15mol·L -1 Nitric acid-0.025mol·L -1 The oxalic acid solution is leached and collected as the Pu component. After evaporating the collected U fraction to dryness, use 1mL 2% HNO 3 Dissolve and wait for MC-ICP-MS analysis.

[0020] Step 4. Use multi-receiver inductively coupled plasma mass spectrometry to measure Pu and Am respectively to obtain 240 Pu / 242 Pu and 236 U / 233 U value.

[0021] ...

Embodiment 2

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

[0029] Step 3. Use 6mL 4mol·L -1 HNO 3 After eluting and collecting as U component, use 8mL 0.1mol·L -1 Nitric acid-0.01mol·L -1 The oxalic acid solution is leached and collected as the Pu component. After evaporating the collected U fraction to dryness, use 1mL 2% HNO 3 Dissolve and wait for MC-ICP-MS analysis.

[0030] The measured age of plutonium is 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 this embodiment is as follows:

[0033] Step 3. Use 9mL 2mol·L -1 HNO 3 After eluting and collecting as U component, use 5mL 0.5mol·L -1 Nitric acid-0.10mol·L -1 The oxalic acid solution is leached and collected as the Pu component. After evaporating the collected U fraction to dryness, use 1mL 2% HNO 3 Dissolve and wait for MC-ICP-MS analysis.

[0034] The measured age of plutonium is 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, Pu and 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 Pu / Pu and U / U . According to the amount of the added diluents, the value of Pu / 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, and specifically relates to the detection technology of the age of trace plutonium. Background technique [0002] In the field of nuclear forensics and verification, it is necessary to detect the age attribute of trace amounts of 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 considered that the sample size needs to be at least 100 mg, and there are certain requirements for the sample shape. 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 larger, and the required measurement time is also longer. In Radiochim. Acta 96, (2008) 327-331, Zhang Haitao and others developed a method for measuring the age of plutonium materials by α spectrum combine...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/626
Inventor 陈彦常志远赵永刚张继龙
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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