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Method for measuring radioactivity of radioactive waste

A radioactive substance and radioactive technology, applied in the field of selective pretreatment of chemical analysis, can solve the problems of difficult separation and pretreatment, achieve the effect of reducing the detectable activity and improving the efficiency of radioactivity measurement

Pending Publication Date: 2021-10-01
KOREA ATOMIC ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since iodine is volatile and exists in various oxidation states and chemical species (organic iodine), there are difficulties in not easily separating iodine from radioactive waste or performing pretreatment for chemical analysis

Method used

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  • Method for measuring radioactivity of radioactive waste
  • Method for measuring radioactivity of radioactive waste
  • Method for measuring radioactivity of radioactive waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Example 1. Adsorption and electrochemical desorption of iodine using a platinum electrode

[0104] Immerse the platinum electrode without iodine attached in 0.1M NaClO 4 As an adsorbent in the aqueous solution, glassy carbon as a counter electrode and an Ag|AgCl electrode as a reference electrode are also immersed in it to form an electrochemical three-electrode battery. A linear sweep voltammetry experiment was performed in the battery from 0 V to below -0.9 V at a sweep rate of 50 mV / s. Take the platinum electrode out of the electrochemical tank and immerse it in 0.001mM KI, I 2 、CH 3 Add the iodine compound of I to excess water (100 mL), and stir for 30 minutes. Then, the platinum electrode was recovered and placed in an electrochemical cell for linear sweep voltammetry experiments in the same environment. The results of linear sweep voltammetry on the electrode according to the adsorption of iodine compounds are shown in Figure 4 middle.

[0105] refer to ...

Embodiment 2

[0108] Example 2. Adsorption and desorption of iodine using a sponge-like adsorbent

[0109] Dissolved with 0.001mM iodide ion (I - ) in excess water (100 mL), a sponge-like platinum adsorbent comprising platinum-coated sponge-like nickel support was added, and stirred for 30 minutes.

[0110] Then, the spongy platinum adsorbent was recovered, and an electrochemical system with the same working electrode as in Example 1 was constructed. Then, an electric potential is applied to dissociate iodine, which is recovered in a small amount of aqueous solution.

[0111] Using a sponge-like platinum adsorbent, the adsorption / desorption of iodine was carried out several times, and the concentration of iodine was measured using the absorption spectrum and ICP-MS measured thereby, and it is shown in Figure 5 middle. In addition, the concentration of iodide in the aqueous solution according to the frequency of adsorption / desorption is shown in Table 1 below.

[0112] 【Table 1】

[0...

Embodiment 3

[0116] Example 3. Iodine Adsorption Using Platinum Plate Discs and Radiometric Measurements Using a Low Energy Gamma Raymeter

[0117] A small amount of radioactive iodine-129 was added to a beaker filled with 50ml of water, and 0.5ml of sulfuric acid or nitric acid was added to it. A platinum plate disc (a glass disc with platinum coated on it) was placed in a beaker to allow the radioactive iodine to be adsorbed on the platinum plate disc. Then, the platinum plate disc was recovered, washed with distilled water, and the water was removed. Then, the platinum plate disc from which moisture was removed was placed in a low-energy gamma ray apparatus to measure radioactivity, and after the radioactivity measurement, an electrochemical device including a three-electrode system having a platinum plate disc as a working electrode, a glass Carbon was used as the counter electrode and Ag|AgCl as the reference electrode.

[0118] At this point, use a glass membrane grid (for exampl...

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Abstract

The present invention relates to a method for measuring radioactivity of radioactive waste, the method comprising an adsorption step (A) of selectively adsorbing a radioactive substance comprising at least one from among radioactive iodine and radioactive cesium from radioactive waste containing radioactive substances on an adsorption member for adsorbing a radioactive substance, and a measurement step (B) of measuring radioactivity of the radioactive substance.

Description

technical field [0001] The present invention provides a method for measuring the radioactivity of radioactive substances in radioactive waste, and a selective pretreatment method for chemical analysis. Background technique [0002] Radioactive iodine and / or radioactive cesium are contained in used radioactive waste containing nuclear fuel, and are radionuclides that are liable to leak in the event of an accident at a nuclear power plant. When the nuclear fuel of a nuclear power plant is damaged, the soluble radioactive elements present inside the damaged nuclear fuel dissolve into the primary system coolant. Among soluble elements, radioactive iodine exists in various types, such as isotopes with short half-lives of a few hours to two months, and iodine-129 with long half-lives of more than tens of millions of years. Radioactive cesium also has a long half-life of 30 years. [0003] Therefore, techniques for removing radioactive iodine and radioactive cesium are very impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/167
CPCG01T1/167G01T1/204G21F9/12B01J20/02G01T7/02B01J20/0229B01J20/28009B01J20/28045B01J20/3441B01J20/0225
Inventor 裵相垠朴正桓金俊赫郑和璟姜柄万朴泰洪林相浩郑谨镐
Owner KOREA ATOMIC ENERGY RES INST
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