Automatic radiochemical separation device for strontium-90

Abstract

The invention discloses an automatic radiochemical separation device for strontium-90. The device comprises a plurality of crown ether extraction chromatographic columns, a plurality of liquid storagebottles, a multichannel switching valve and a reciprocating metering pump. The liquid storage bottles comprise at least one equilibrium liquid storage bottle, at least one leacheate storage bottle, at least one eluent storage bottle and at least one waste liquid storage bottle. The multichannel switching valve is provided with a main port, a sample injection branch port, a plurality of chromatographic column branch ports and a plurality of liquid storage bottle branch ports, each chromatographic column branch port is connected with one crown ether extraction chromatographic column, and each liquid storage bottle branch port is connected with one liquid storage bottle. One end of the reciprocating metering pump is connected with the main port. The device can realize automatic radiochemicalseparation of strontium-90, remarkably shortens the radiochemical separation time of a sample, and is high and stable in recovery rate of strontium-90.

Description

technical field [0001] The invention relates to the technical field of radioisotope separation, in particular, the invention relates to an automatic radiochemical separation device for strontium-90. Background technique [0002] Strontium-90( 90 Sr) is a β-decay radionuclide without γ-rays, and is often measured by measuring strontium-90 or its decay daughter yttrium-90 ( 90 Y) β-rays, β-rays are a continuous spectrum, and will be interfered by other radionuclide β-rays during measurement. Therefore, when measuring strontium-90 in environmental water, it is necessary to perform radiochemical separation of the sample to remove other radionuclides in the sample and obtain a sample containing only strontium-90. [0003] At present, the radiochemical separation of strontium-90 in domestic environmental water mainly adopts the manual analysis method in the laboratory. There are problems such as high requirements for operators, insufficient manual analysis professionals, and lo...

AI Technical Summary

Problems solved by technology

[0004] The existing crown ether chromatographic extraction method requires manual analysis, which is difficult to automate

The main difficulties in automation are as follows: 1. The crown ether chromatography extraction method needs to switch a variety of different reagents during the automation process, which will lead to mutual contamination of the reagents

2. Crown ether will be lost after using the crown ether extraction chromatography resin for many times, resulting in a weakened adsorption capacity for strontium-90, which is not conducive to the long-term stable operation of an automatic system

In addition, the samples obtained by the existing crown ether extraction method need to be dried before they can be measured. This step requires a more precise operation by the operator, which takes a long time and is difficult to automate.

If a liquid scintillator detector is used for measurement, the detection efficiency will be reduced due to the high acidity of the sample, and quenching stratification will occur, and the measurement effect will be poor

[0005] In summary, the existing radiochemical separation methods for strontium-90 still need to be improved

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