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Method for preparing [alpha] measurement source of polonium according to micro precipitation method

A technology of precipitation method and aqueous solution, which is applied in the field of micro-precipitation method to prepare polonium α measurement source, can solve the problems of inconvenient time-consuming, probe pollution, etc., and achieve the effect of short time consumption, easy batch production, fast and effective measurement

Active Publication Date: 2018-07-10
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although this sample preparation technique is widely used, the entire sample preparation process, especially the heating step, can be inconvenient and time-consuming
[0006] Sulfide micro-precipitation of polonium is another common method for preparing Po-α sources. The problem with this method is that sulfide precipitation tends to produce H with the smell of rotten eggs under acidic conditions. 2 S gas, and the sulfide microprecipitation method is usually prepared in a low concentration of HCl (usually 0.1M to 1M), this alpha source will also pollute the probe to a certain extent

Method used

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  • Method for preparing [alpha] measurement source of polonium according to micro precipitation method
  • Method for preparing [alpha] measurement source of polonium according to micro precipitation method
  • Method for preparing [alpha] measurement source of polonium according to micro precipitation method

Examples

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Effect test

Embodiment 1

[0028] Example 1: The influence of acidity on the recovery rate of microprecipitation of the α measurement source for preparing polonium by microprecipitation method

[0029] Add 25mBq to 10mL hydrochloric acid solution in sequence 209 Po standard radioactive source, 100μg Te(IV), 5mL isopropanol, mix well, and finally add 1mL 10% SnCl 2 Shake the solution, let it stand for 10 minutes, filter with suction (0.1-μm filter membrane), intercept the Po-α spectrum measurement source, investigate the influence of different concentrations (acidity) of hydrochloric acid on the recovery rate of microprecipitation, see the results figure 1 . The formula for calculating the recovery rate of micro-precipitation is as follows:

[0030]

[0031] among them:

[0032] The recovery rate of R-Po micro-precipitation;

[0033] CR 209 —Radiotracer in the sample 209 Decay rate of Po (times s -1 );

[0034] I 209 —The selected energy in the spectrum 209 Abundance of Po;

[0035] A 209 -Added to the sample 209 ...

Embodiment 2

[0038] Example 2: The influence of Te(IV) content on the microprecipitation recovery rate of the α measurement source for preparing polonium by the microprecipitation method

[0039] Add 25mBq to 10mL 1M HCl sequentially 209 Po standard radioactive source, Te(IV), 5mL isopropanol, mix well, and finally add 1mL 10% SnCl 2 Shake the solution, let it stand for 10 minutes, filter with suction (0.1-μm filter membrane), cut off and prepare the Po-α spectrum measurement source, investigate the effect of different Te(IV) content on the recovery rate of microprecipitation, see the results figure 2 .

[0040] by figure 2 It can be seen that the Te(IV) content in the range of 10-250μg can effectively carry the polonium, and the resolution of the spectra of polonium is very good. Finally, 100 μg Te(IV) is preferred to ensure the recovery rate of polonium microprecipitation.

Embodiment 3

[0041] Example 3: The effect of oxidation-reduction reaction time on the recovery rate of micro-precipitation of α measurement source for preparing polonium by micro-precipitation method

[0042] Add 25mBq to 10mL 1M HCl sequentially 209 Po standard radioactive source, 100μg Te(IV), 5mL isopropanol, mix well, and finally add 1mL 10% SnCl 2 Solution, shake well, let stand for a period of time, suction filter (0.1-μm filter membrane), cut off the preparation of Po-α spectrum measurement source, investigate the effect of different oxidation-reduction reaction time on the recovery rate of microprecipitation, see the results image 3 .

[0043] by image 3 It can be seen that the micro-precipitation recovery rate of micro-precipitated polonium can reach 95% after the reaction time of 10 minutes, and the micro-precipitation recovery rate of tellurium reduction micro-precipitation polonium is between 95%-98% in the reaction time of 4 hours. , And within 24 hours, the amount of precipitat...

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Abstract

The invention belongs to the technical field of radioactive substance measurement, and relates to a method for preparing an [alpha] measurement source of polonium according to a micro precipitation method. The method comprises the steps of (1) adding Te(VI) or Te(IV), a polonium-containing sample, a radioactive tracer <209>Po, a reducing substance and an organic solvent capable of being mixed anddissolved with water and reducing the solubility of TeO2 or elementary substance Te into an aqueous solution so as to enable the Te(VI) or Te(IV) to have an oxidation-reduction reaction with the reducing substance, the TeO2 or elementary substance Te obtained by reduction is enabled to serve as a carrier to take down the radioactive polonium and uniformly disperse the radioactive polonium into theaqueous solution under the effect of the organic solvent; and (2) enabling the carrier taking the radioactive polonium to be uniformly dispersed on a filtering membrane through filtering. Compared with the traditional auto precipitation method for preparing the [alpha] measurement source of the polonium, the method for preparing the [alpha] measurement source for the polonium is short in time, simple to operate, easy to perform batch production, low in cost, higher in acid resistance and anti-interference ability and capable of obtaining a polonium recovery rate (85%-100%) which is close to or higher than that of the auto precipitation method.

Description

Technical field [0001] The invention belongs to the technical field of radioactive substance measurement, and relates to a method for preparing an alpha measurement source of polonium by a microprecipitation method. Background technique [0002] 210 Po is a natural radionuclide, belonging to the natural radioactive uranium series ( 238 U). 210 Po belongs to the extremely toxic group of radionuclides, only 1 microgram is enough to be fatal to an ordinary adult, and its toxicity is about 250,000 times that of hydrogen cyanide (HCN). 210 Po is volatile and widely exists in environmental media such as soil, rock, water, organisms, etc. It can enter the human body through ingestion and inhalation. Due to its toxicological properties, it is necessary to determine how to measure soil, sediment, aerosol, water, food, tobacco, cigarettes, urine and biological materials and geological samples 210 Po content is studied. [0003] The methods of analyzing polonium mainly include precipitation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 宋丽娟戴雄新罗茂益
Owner CHINA INST FOR RADIATION PROTECTION
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