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Method for analyzing <238>Pu/<239+240>Pu in plant based on TOA-TRU combined extraction

An analysis method and plant technology, applied in the direction of analysis of materials, material separation, measurement devices, etc., can solve the problems of inability to determine the accuracy of analysis, failure to describe the analysis process and parameters, and achieve the effect of eliminating counting interference.

Active Publication Date: 2020-08-11
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have the following two problems: first, most of the methods do not describe the specific analysis process and parameters; 228 Th, 241 Am, 210 The decontamination degree of Po is described and cannot be determined 238 Pu / 239+240 Accuracy of Pu analysis

Method used

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  • Method for analyzing &lt;238&gt;Pu/&lt;239+240&gt;Pu in plant based on TOA-TRU combined extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0079] Take 10 g of plant ash sample after incineration in a certain area, add 0.128 Bq tracer after burning 242 Pu, 8 mol / L nitric acid heating leaching, concentrated ammonia water adjusted to pH 9~10 to achieve co-precipitation, 30 mL 8 mol / L nitric acid to dissolve the precipitate; TOA solid-phase extraction: use 50 mL 10 mol / L hydrochloric acid, 30 Wash the TOA column sequentially with mL 3 mol / L nitric acid, desorb Pu with 0.025 mol / L oxalic acid-0.150 mol / L nitric acid solution; The TRU column was washed with L nitric acid, and Pu was eluted with 0.1 mol / L ammonium hydrogen oxalate solution; the source was prepared by micro-sedimentation and measured by α spectrometer for 200,000 s.

[0080] Experimental results: Pu recovery rate = 78.0%, 241 Decontamination factor of Am>10 3 , 228 Decontamination factor of Th > 10 3 , 210 Decontamination factor of Po>10 4 .

Embodiment 2

[0082] Take 10 g of plant ash sample after incineration in a certain area, add 0.128 Bq tracer after burning 242 Pu, 8 mol / L nitric acid heating leaching, concentrated ammonia water adjusted to a pH value of 9~10 to achieve co-precipitation, 30 mL 8 mol / L nitric acid to dissolve the precipitate; TOA solid-phase extraction: use 70 mL 10 mol / L hydrochloric acid, 30 Wash the TOA column sequentially with mL 3 mol / L nitric acid, desorb Pu with 0.025 mol / L oxalic acid-0.150 mol / L nitric acid solution; The TRU column was washed with L nitric acid, and Pu was eluted with 0.1 mol / L ammonium hydrogen oxalate solution; the source was prepared by micro-sedimentation and measured by α spectrometer for 200,000 s.

[0083] Experimental results: Pu recovery rate = 74.6%, 241 Decontamination factor of Am>10 4 , 228 Decontamination factor of Th>2×10 3 , 210 Decontamination factor of Po>5×10 4 .

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Abstract

The invention discloses a method for analyzing <238>Pu / <239+240>Pu in a plant based on TOA-TRU combined extraction. The method aims to solve the problems that when <238>Pu / <239+240>Pu analysis is carried out on a plant sample, strong counting interference of <228>Th and <241>Am on <238>Pu exists, and strong counting interference of high-content <210>Po on <239+240>Pu exists. The analysis method comprises the following steps of sample carbonization, tracer agent addition, heating extraction, coprecipitation, Pu valence adjustment, TOA solid-phase extraction Pu separation, purification and elution, TRU solid-phase extraction Pu separation, purification and elution, micro-deposition source preparation, alpha spectrometer measurement and the like. In view of the characteristic that TRU can remove Po in a Pu solution, the TOA solid-phase extraction method and the TRU solid-phase extraction method are combined, efficient decontamination of <228>Th, <241>Am and <210>Po is realized, the accuracy of <238>Pu / <239+240>Pu analysis is ensured, and the TOA-TRU combined extraction-based <238>Pu / <239+240>Pu analysis method in the plant is established. The combined method disclosed by the inventioncomprises the following two aspects: 1, during TOA extraction, efficient decontamination of <228>Th and <241>Am needs to be ensured; and 2, during TRU extraction, efficient decontamination of <210>Pois ensured.

Description

technical field [0001] The invention relates to the technical field of plutonium isotope ratio analysis in plants, in particular to a plant based on TOA-TRU joint extraction 238 Pu / 239+240 Pu analysis method. Background technique [0002] Plants in the surrounding environment of nuclear facilities 238 Pu / 239+240 The informative signature of the Pu activity ratio can be used to assess nuclear activity, where the key is to break through ultratrace levels in plant samples 238 Pu and 239+240 Highly sensitive analysis of Pu to obtain accurate nuclide ratios. [0003] 238 Pu and 239+240 Pu belongs to ultra-trace nuclides. In order to achieve statistically significant counts, the amount of plant sampling required to reach 10–20 g (calculated as the plant ash after ashing of fresh plant samples) is required for α-spectrum analysis. 238 Pu analysis will be subject to 228 Th and 241 Am's interference, 228 Th summit with 238 The Pu peaks partially overlap, 241 Am summit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/34G01N30/62
CPCG01N30/02G01N30/06G01N30/34G01N30/62G01N2030/062G01N2030/77
Inventor 张海玲杨钰宁武俊红黄鹤翔赵东董文静黄磊
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS