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Preparation method of plutonium source for laser resonance ionization mass spectrometric test

An ionization mass and laser technology, applied in the field of radiation monitoring, can solve the problems of insufficient detection sensitivity, insufficient heat resistance of resin beads, and low atomization efficiency, so as to improve atomization efficiency, suppress interference, Prevents the effect of generating

Inactive Publication Date: 2017-10-20
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the heat resistance of resin beads is not good enough, and it is easy to generate Pu compounds such as PuC that are difficult to decompose; when directly coating samples, it is easy to lose Pu during the process of coating and transferring.
More importantly, in the two methods, the Pu sample is directly exposed to the system in the form of an ionic compound, and low-temperature heating can cause its rapid evaporation, and most of the sample is directly converted into ions instead of atoms, resulting in low atomization efficiency, The detection sensitivity that directly affects the measurement cannot meet the analysis requirements of trace Pu in environmental samples

Method used

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  • Preparation method of plutonium source for laser resonance ionization mass spectrometric test

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Embodiment 1

[0034] The specific implementation manners of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings. Example 1: Preparation of plutonium source for laser resonance ionization mass spectrometry

[0035] according to figure 1 The flow shown is for the preparation of a plutonium source for laser resonance ionization mass spectrometry.

[0036] (1) Pretreatment of rhenium strips: Cook the rhenium strips with 6mol / L HCl for 5 minutes, then wash them with deionized water, dry them in the air, and set them aside.

[0037] (2) Electrodeposition tank preparation and inspection: fix the rhenium strip on the electrodeposition tank, control the active area to be 4mm in length and 0.8mm in width, add deionized water, check for leaks, and set aside.

[0038] (3) Preparation of plutonium electrodeposition solution: add 5ml of 0.1mol / L ammonium sulfate solution to the electrodeposition tank, and add 2 drops of 239 Nitrate so...

Embodiment 2

[0042] Embodiment 2: Laser resonance ionization mass spectrometry test

[0043] Laser resonance ionization mass spectrometry (Northwest Institute of Nuclear Technology, model NINT300) was tested with the plutonium source prepared by the method of Example 1. During the recording time, the measured ion count was 5.60 × 10 9 . And because the total mass of plutonium on the rhenium belt is 11.68ng, the ratio of the number of ions recorded in the time interval to the total number of atoms is:

[0044] R=5.60×10 9 / (11.68×2.5×10 12 )=1.9×10 -4

[0045] Considering that the time-space duty cycle of laser and atomic beam is about 6×10 -3 (Estimated from the relevant data ), the total transmission efficiency of the ion optical system is about 50% (considering the pass rate of the suppression grid and the ion optics The transmission efficiency of the system), the atomic layout number of the ground state at the measurement temperature (1000-1100 ° C) is 75%, then the atomization e...

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Abstract

The invention belongs to the technical field of radiation monitoring, and relates to a preparation method of a plutonium source for a laser resonance ionization mass spectrometric test. The preparation method comprises the following steps of electrodeposition: electrodepositing plutonium oxide on a rhenium ribbon; vacuum titanium evaporation: evaporating metallic titanium on the rhenium ribbon on which the plutonium oxide is electrodeposited. By utilizing the preparation method of the plutonium source for the laser resonance ionization mass spectrometric test, which is provided by the invention, the loss of plutonium in the preparation process of the plutonium source can be reduced; the generation of difficult-to-decompose Pu compounds of PuC and the like is prevented; the atomization efficiency of the plutonium is improved; the formation of a plutonium ion is prevented.

Description

technical field [0001] The invention belongs to the technical field of radiation monitoring, and relates to a method for preparing a plutonium source for laser resonance ionization mass spectrometry testing. Background technique [0002] Nuclear tests, nuclear facilities, nuclear accidents, and satellites using Pu as energy released a considerable amount of Pu to the environment when they returned to the earth and burned, about 1.86×10 16 Above Bq, which mainly comes from atmospheric nuclear tests. Pu in the environment mainly has 238 Pu, 239 Pu and 240 Pu and other isotopes, with 239 Pu is the main one. Pu can enter the human body through inhalation, ingestion and infiltration, causing harm; Pu isotope composition is different for different uses and sources. Therefore, the monitoring technology of Pu in the research environment is of great significance to the nuclear environment assessment and the source term analysis of Pu. [0003] The common analysis method of Pu ...

Claims

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Application Information

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IPC IPC(8): G01N27/64G01N1/34G01N1/28C23C28/00
CPCG01N27/64C23C28/322C23C28/345G01N1/28G01N1/34
Inventor 杨金玲张生栋丁有钱孙晓祎
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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