Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for determining the activity concentration of potassium-removed 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: 2017-10-31
SUZHOU NUCLEAR POWER RES INST +3
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for determining the activity concentration of potassium-removed total beta radionuclides in seawater
  • A method for determining the activity concentration of potassium-removed total beta radionuclides in seawater
  • A method for determining the activity concentration of potassium-removed total beta radionuclides in seawater

Examples

Experimental program
Comparison scheme
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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a method for determining the activity concentration of potassium-removed total beta radionuclides in seawater, which is characterized in that it comprises the following steps: (a) adding a cobalt element carrier to the taken seawater to form a cobalt ion solution, and then adjusting When the pH value reaches alkaline, add thioacetamide to form a cobalt sulfide precipitate; (b) take the cobalt sulfide precipitate and place it at 600~800°C for ashing; (c) add the finely ground ashing powder to the measuring pan For the product, add ethanol to spread the sample, place it in a flow-type proportional counter for measurement and then calculate it. The enrichment rate of 58Co, 60Co, 59Fe, 65Zn, 110mAg and other beta radionuclides discharged into seawater during the operation of nuclear facilities by this method is higher than 95%, thus ensuring that the final precipitate obtained by this analysis method is relatively uniform and of high quality. Moderate; its detection limit level is 3mBq / L, which is suitable for monitoring the activity concentration of potassium-removed total beta radionuclides in seawater, and is also suitable for high brine similar to seawater samples and high brine containing radionuclides after treatment etc. monitoring.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com