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Method for measuring activity concentration of kalium-subtracted total beta radionuclides in seawater

A technology of β radioactivity and nuclide activity, which is applied in the field of radioactive element detection, can solve the problem that the calibration source cannot be truly reflected, and achieve the effect of moderate quality and uniform precipitation

Active Publication Date: 2015-09-09
SUZHOU NUCLEAR POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the β nuclide energy released to the environment during the operation of nuclear facilities is below 600keV, and the detection efficiency of the α / β measuring instrument increases with the increase of the nuclide energy under the same measurement conditions. 40 K or 90 Sr / 90 Y, as the calibration source of the total β radioactive efficiency of seawater potassium removal, cannot truly reflect the β radionuclides discharged into seawater during the operation of nuclear facilities

Method used

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  • Method for measuring activity concentration of kalium-subtracted total beta radionuclides in seawater
  • Method for measuring activity concentration of kalium-subtracted total beta radionuclides in seawater
  • Method for measuring activity concentration of kalium-subtracted total beta radionuclides in seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0021] This embodiment provides a method for determining the activity concentration of total beta radionuclides in seawater, specifically:

[0022] Take 3.0L seawater, and add cobalt nitrate to it, add ammonia water to adjust the pH value of the solution to about 9.1; stir and heat to 70°C; add 30mL thioacetamide solution (40g / L), then add ammonia water to adjust the pH value of the solution Adjust to 8.3, continue to stir for 15min; place overnight (more than 10h), after the precipitation is coagulated, siphon off the supernatant, and filter the remaining part under vacuum with a filter membrane; put the cobalt sulfide precipitate and the filter membrane in a muffle furnace , burn at 700°C for 2 hours;

[0023] Weigh the cobalt sulfide precipitate, take out 110mg sample, grind it finely in a mortar, transfer it to a stainless steel measuring pan with constant weight, add ethanol dropwise, and spread the sample evenly;

[0024] If the gas flow proportional counter is used for...

experiment example 1

[0034] A certain amount of Co containing 2+ , Fe 3+ , Zn 2+ 、Ag + solution, the experiment adopts the precipitation method in Example 1 to process 1L, 2L and 3L seawater samples, and adopts an atomic absorption spectrophotometer to measure the Co 2+ , Fe 3+ , Zn 2+ 、Ag + content, the calculated enrichment efficiency is shown in Table 1. As can be seen from Table 1, the analysis method of co-precipitation of cobalt sulfide is very effective for Co 2+ , Fe 3+ , Zn 2+ 、Ag + The enrichment efficiencies were all higher than 95%. Therefore, the method of the present invention can be used to enrich the Co in seawater sample 2+ , Fe 3+ , Zn 2+ 、Ag + .

[0035] Table 1 Measurement results of metal ion enrichment efficiency in seawater samples

[0036]

[0037]

experiment example 2

[0039] Example 1 After adding excess thioacetamide, adjust the pH of the cobalt ion solution to 8.3 with ammonia water, and then continue stirring at constant temperature for 15 minutes. In this experimental example, the constant temperature time was compared, specifically: take 5 parts of 1L seawater samples, add the same amount of Co 2+ , Fe 3+ , Zn 2+ 、Ag + The solution was treated by the precipitation method in Example 1, and the constant temperature time was set to 0.25h, 0.5h, 1.0h, 1.5h, and 2.0h, respectively. After the precipitation, the solution was placed overnight (more than 10 h), and the Co in the supernatant was measured by an atomic absorption spectrophotometer after the precipitation was coagulated. 2+ , Fe 3+ , Zn 2+ 、Ag + content, the calculated enrichment efficiency see figure 2 . from figure 2 It can be seen that the constant temperature of 0.25h has the best effect; as the reaction time prolongs, the pH of the solution decreases, making the Co ...

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Abstract

The invention relates to a method for measuring the activity concentration of kalium-subtracted total beta radionuclides in seawater, and the method is characterized in that the method comprises the following steps: (a) adding a cobalt carrier into used seawater, forming cobalt ion solution, adjusting the pH value of the cobalt ion solution to be greater than seven, and then adding thioacetamide into the solution to form cobalt sulfide sediments through reaction; (b) extracting and putting the cobalt sulfide sediments under the temperature from 600 DEG C to 800 DEG C for ashing; (c) adding porphyrized ashing products to a measuring disc, adding an ethyl alcohol sample, and putting the mixture on a flow-gas type proportional counter for measurement and calculation. The method achieves the measurement of beta radionuclides with the enrichment ratio being greater than 95% which is discharged into the seawater in an operation process of nuclear facilities, such as 58Co, 60Co, 59Fe, 65Zn, 110mAg and so on, thereby guaranteeing that the sediments prepared through the method are more uniform and moderate in weight. The detection lower limit is 3mBq / L, so the method is suitable for the monitoring of the activity concentration of kalium-subtracted total beta radionuclides in seawater, and is also suitable for heavy-salt water similar to a seawater sample, and heavy-salt water which contains radionuclides and is obtained through processing.

Description

technical field [0001] The invention belongs to the field of radioactive element detection, and relates to a method for measuring the activity concentration of beta radionuclides, in particular to a method for measuring the activity concentration of total beta radionuclides in seawater after potassium removal. Background technique [0002] At present, most nuclear power plants in the world are built along the coast. During the operation of nuclear power plant reactors, fission products will be produced. When the fuel assembly is damaged, it will enter the primary circuit coolant, such as 106 Ru, 90 Sr, 137 Cs, etc.; cobalt, manganese, iron, nickel, zinc, antimony, silver and other elements in the primary circuit materials are released into the cooling water of nuclear reactor due to corrosion, etc., and are produced by neutron activation reaction 60 Co. 58 Co. 54 Mn, 59 Fe, 63 Ni, 65 Zn, 124 Sb, 110 Ag and other radionuclides. The above nuclides except 54 Mn has β...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/18
Inventor 吴连生刘衡李付平贺毅曾帆李静孙伟黄彦君陈超峰郭贵银杨立涛钦红娟
Owner SUZHOU NUCLEAR POWER RES INST
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