Method for polonium purification and source preparation in aerosol

An aerosol and sample solution technology, applied in the preparation of test samples, etc., can solve the problems affecting the analysis results of the nuclide to be tested, the unstable recovery rate of the purification source test method, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2018-05-11
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] According to the above method in the daily experiment process, it is found that the recovery rate of the purification source test method is unstable, which directly affects the analysis results of the nuclides to be tested

Method used

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  • Method for polonium purification and source preparation in aerosol
  • Method for polonium purification and source preparation in aerosol
  • Method for polonium purification and source preparation in aerosol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Orthogonal Design Test Determines Significant Influencing Factors

[0037] by 209 Po (the activity is preferably 0.03-1.0Bq) is used as the yield tracer, and the method of purifying polonium in the aerosol is first carried out the orthogonal design test, considering the experimental factors and levels of the purification source, including 5 4 factors are considered, and the specific design is shown in Table 1.

[0038] Table 1 The experimental factors and levels considered in the orthogonal design experiment of polonium purification source

[0039]

[0040] Get the leaching solution of the actual aerosol sample (collect the aerosol sample in Taiyuan City, leaching the aerosol sample through the acidification leaching method to obtain the leaching solution), add 209 Po is used as a tracer, and the orthogonal design experiment is carried out, and the factors and levels of the purified source are included in the L 16 (4 5 ) in the experiment table, wit...

Embodiment 2

[0045] Embodiment 2: Single factor effect experiment of water bath temperature in constant temperature water bath oscillation

[0046] The temperature of the water bath in the constant temperature water bath oscillation is 20°C (room temperature), 50°C, 70°C, 80°C, 85°C, 90°C, 96°C (boiling water temperature in Taiyuan area), and 3 parallel samples are made at each temperature. Add 50mL0.5mol / LHCl, 0.5mL25% hydroxylamine hydrochloride, 0.2g ascorbic acid to each sample, add 2.0mL accurately 209 Put the Po standard solution in a constant temperature oscillator to purify the source for 2.0h, take out the copper piece, rinse it with distilled water, dry it naturally, and put it into the α spectrometer for measurement. according to 209 The activity of Po is used to calculate the recovery rate of the purified source. The experimental results are shown in figure 2 .

[0047] The experimental results show that: with the increase of temperature, the recovery rate of purified sour...

Embodiment 3

[0048] Embodiment 3: Single factor influence experiment of constant temperature water bath oscillation time

[0049] The constant temperature water bath shaking time was selected as 0.5h, 1.0h, 2.0h, 3.0h, 5.0h, respectively, and each group had 3 parallel samples. Add 100mL0.1mol / LHCl, 0.5mL25% hydroxylamine hydrochloride, 0.2g ascorbic acid to each sample, add 2.0mL accurately 209 Put the Po standard solution in a constant temperature oscillator at boiling water temperature to purify the source for 2.0 hours, take out the copper piece, rinse it, dry it naturally, and put it into the α spectrometer for measurement. according to 209 The activity of Po is used to calculate the recovery rate of the purified source. The experimental results are shown in image 3 .

[0050] The experimental results show that the longer the shaking time in the constant temperature water bath, the higher the recovery rate. When the time is between 2.0h-5.0h, the recovery rate tends to be stable a...

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Abstract

The invention belongs to the technical field of radioactive substance impact assessment, and relates to a method for polonium purification and source preparation in aerosol. The method sequentially comprises: (1) transferring a pre-treated polonium sample to be determined into an erlenmeyer flask, and adding <208>Po(IV) or <209>Po(IV) with a certain activity as a tracer to obtain a polonium sampleto be subjected to purification and source preparation; (2) placing the polonium sample obtained in the step (1) in a water bath, evaporating to remove more than 90% of the liquid, and cooling to a room temperature; (3) adding a hydrochloric acid solution, a hydroxylamine hydrochloride solution and ascorbic acid to the sample solution obtained in the step (2), mixing, and uniformly shaking; (4) adding the sample solution obtained in the step (3), and a polished silver sheet or copper sheet to a device capable of providing a certain sealing effect and a certain condensation recovery effect; (5) after installing the device, placing into an oscillator, and carrying out constant temperature water bath oscillation; and (6) after carrying out oscillation for a certain time, taking the poloniumplated silver sheet or copper sheet out of the device, rinsing with distilled water, and carrying out air drying. With the method of the present invention, the recovery rate of the purification and source preparation can be increased and stabilized so as to improve the accuracy of the <210>Po determination result.

Description

technical field [0001] The invention belongs to the technical field of impact assessment of radioactive substances, and relates to a method for purifying polonium sources in aerosols. Background technique [0002] After the Fukushima nuclear accident in Japan, my country put forward higher requirements for the construction and operation of nuclear facilities. At the same time, with the increasing requirements of national environmental protection, the continuous strengthening of public environmental awareness and the implementation of energy conservation and emission reduction policies, it is very important to improve the level of relevant analysis technologies and ensure that relevant units can better complete environmental monitoring and evaluation work. significance. 210 Po is 238 Produced by the U decay chain, it is an extremely toxic α-radioactive nuclide, which widely exists in soil, rocks, water bodies, organisms and other environmental media, and can enter the human...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 李鹏翔李周赵杨军张静王瑞俊高泽全保莉李园杨宇轩宋沁楠姜恺王猛
Owner CHINA INST FOR RADIATION PROTECTION
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