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Determination method of plutonium age in trace plutonium sample

A determination method and sample technology, applied in the field of radioisotope measurement, can solve the problems of expensive instruments, poor reproducibility of age results, and cumbersome sample processing process, and achieve high method accuracy, short sample analysis time, and high recovery rate. Effect

Active Publication Date: 2011-03-16
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 instrument is relatively expensive, and the reproducibility of the age results for weapons-grade plutonium is not very good

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
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Effect test

Embodiment 1

[0015] Weigh the concentration of plutonium as 107ng·g -1 A sample of 0.0389g of plutonium solution was added to measure the β count rate by adding scintillator. The measurement results are shown in Table 1.

[0016] Weigh the concentration of plutonium as 107ng·g -1 The plutonium solution sample 0.0407g, add 243 Am tracer 0.407g, where 243 Am concentration is 47.93pg·g -1 , after reaching exchange equilibrium, add 600 μL 4×10 -3 mol L -1 NaNO 2 , evaporated to dryness after reacting for 10 minutes, and added 1 mL of 2mol·L -1 HNO 3 Transfer to TEVA resin column, the volume of resin is 1mL, use 1.5mL 2mol·L -1 HNO 3 Wash and collect the Am component, evaporate the Am component to dryness and add 8 mL of 0.15mol L -1 Nitric acid-0.025mol·L -1 Transfer the oxalic acid solution to the electrodeposition tank, adjust the pH value between 1 and 2 with concentrated ammonia water, conduct electrodeposition at a constant current of 600mA for 2 hours, and measure the α spect...

Embodiment 2

[0025] The measurement method and sample are the same as in Example 1, except that the Am component is separated. The specific method is to use 2.5mL 1.5mol·L TEVA resin column -1 HNO 3 Wash and collect the Am fraction, evaporate the Am fraction to dryness and add 10mL of 0.1mol L -1 Nitric acid-0.01mol·L -1 Transfer the oxalic acid solution to the electrodeposition tank, adjust the pH value between 1 and 2 with concentrated ammonia water, conduct electrodeposition at a constant current of 650mA for 1.5 hours, and measure the α spectrum of the electrodeposited sheet source. The plutonium age was determined to be 22.04 years.

Embodiment 3

[0027] The measurement method and sample are the same as in Example 1, except that the Am component is separated. The specific method is to use 1.3mL 2.5mol·L TEVA resin column -1 HNO 3 Wash and collect the Am fraction, evaporate the Am fraction to dryness and add 10mL of 0.5mol L -1 Nitric acid-0.1mol·L -1 Transfer the oxalic acid solution to the electrodeposition tank, adjust the pH value between 1 and 2 with concentrated ammonia water, conduct electrodeposition at a constant current of 700mA for 1 hour, and measure the α spectrum of the electrodeposited sheet source. The plutonium age was determined to be 23.65 years.

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Abstract

The invention discloses a determination method of plutonium age in a trace plutonium sample. In the method, a sample of plutonium is taken and measured. A scintillator is added to measure Beta counting rate for obtaining the amount of <241>Pu. In another similar sample of plutonium, the isotopic diluent of americium, namely, <243>Am, is added to conduct price adjustment, a TEVA resin column is added, nitrate is used for leaching and collecting the Am component, Alpha spectrum is used for measuring the value of <241>Am / <243>Am . The amount of <241>Am is calculated and substituted into the age-calculating formula to obtain the age of plutonium. The method has simple chemical separation process and high recovery rate. The sample analysis time is short, the instrument operation is simple, andthe method accuracy is high.

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): G01N23/00G01N1/28
Inventor 陈彦常志远赵永刚李井怀舒复君
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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