Selective Adsorption of Radioactive Iodine and Cesium
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Solution Overview
Problem
Current methods for measuring radioactivity in radioactive waste, particularly for radioactive iodine and cesium, face challenges due to volatility and multiple oxidation states of iodine, making separation and pretreatment difficult for efficient chemical analysis.
Innovation Solution
A method involving selective adsorption of radioactive iodine and cesium using adsorption members with platinum group metals and Prussian blue, followed by radioactivity measurement, which concentrates low-concentration substances for improved detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chemical analysis methods are used for radioactive iodine and cesium, then measurement can be performed, but measurement efficiency is reduced due to interference and difficulty in separation and pretreatment
Solution Approach 1:
The invention separates the measurement process into two distinct stages: first, selective adsorption of radioactive substances onto specific adsorbents (silver wool for iodine, Prussian blue for cesium), and second, gamma-ray measurement of the adsorbed substances. This segmentation eliminates the need for complex chemical pretreatment and enables efficient measurement by handling each radioactive substance independently on suitable adsorbents.
2Measurement precision
If radioactive substances are measured at very low concentrations, then detection sensitivity is required, but minimum detectable activity is high without concentration
Solution Approach 1:
The invention performs preliminary concentration of radioactive substances by adsorbing them from large volumes of radioactive waste onto adsorbents before measurement. This preliminary action concentrates trace amounts of radioactive iodine and cesium onto small amounts of adsorbent material, thereby increasing the concentration and enabling sensitive detection with minimum detectable activity below 0.1 Bq.
3Measurement precision
If direct measurement of radioactive waste is attempted, then measurement can be performed, but interference such as self-absorption and self-attenuation occurs
Solution Approach 1:
The invention extracts radioactive substances from the complex radioactive waste matrix by selective adsorption onto specific adsorbents. This extraction removes the interfering components of the waste and isolates the radioactive substances of interest, eliminating self-absorption and self-attenuation effects that would otherwise occur during direct measurement of the waste.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances radioactivity measurement efficiency by concentrating radioactive substances, reducing minimum detectable activity, and allows for effective separation and analysis without interference, such as self-absorption or self-attenuation.
Implementation Method 1
an adsorption step (A) of selectively adsorbing a radioactive substance including at least one from among radioactive iodine and radioactive cesium from radioactive waste containing radioactive substances on an adsorption member for a adsorbing radioactive substance
Implementation Method 2
A method involving selective adsorption of radioactive iodine and cesium using adsorption members with platinum group metals and Prussian blue
Data Source
AI summary
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.