Method and system for detecting radium content in liquid based on automatic control

Abstract

The invention relates to a method and a system for detecting radium content in liquid based on automatic control, which are characterized in that a liquid sample is pretreated to obtain an evaporated and concentrated liquid sample, the evaporated and concentrated liquid sample is transferred to a diffuser in a radon gas collecting unit, radon gas collection is performed in a scintillation chamber, and the radon gas is collected in a liquid sample collecting unit; the collected radon gas reacts with a coating substance on the inner wall of the scintillation chamber and generates an optical signal; the detection unit converts the received optical signal into an electric signal and calculates the radium content data in the liquid according to the electric signal; according to the method for detecting the content of the radium in the liquid based on automatic control, separation of precipitation and dissolution is achieved through a magnetic heating rotating table, cross interference is avoided, a radon gas collecting unit and a radon gas detecting unit are combined into a whole, radon gas can be directly measured after being collected, and other operation is not needed. The automation degree of the system is high, and harm of radioactive substances to operators is greatly reduced.

Description

technical field [0001] The invention belongs to the field of measurement and analysis, in particular to a method and system for detecting radium content in liquid based on automatic control. Background technique [0002] At present, the commonly used radium-226 detection methods include emanation scintillation method, gamma energy spectroscopy, liquid scintillation counting method, alpha energy spectroscopy method and alpha counting method, among which emanation scintillation method is a classic detection method of radium-226, and its development is relatively mature . The emanation scintillation method is still the most used in my country's relevant testing standards. First, the sample is pretreated to form a precipitate and then separated. After the precipitate is dissolved, it is placed in a diffuser to accumulate radon-222. After the daughter body is balanced, it is detected on the radon gas analyzer, and then the radioactivity of radium-226 is calculated through the act...

AI Technical Summary

Problems solved by technology

[0005] The entire process of measuring radium in drinking water is manually operated by the experimenters without automatic instruments, which not only causes some harm to the experimenters, but also introduces artificial errors into the experimental results.

Moreover, the experiment process is limited by the work and rest of the operator, so it cannot be carried out continuously, which is time-consuming and labor-intensive

Since the concentration of heavy metal ions in the sample cannot be predicted in advance, the amount of EDTA-2Na (disodium ethylenediaminetetraacetic acid) added is not easy to control, resulting in incomplete dissolution and precipitation of heavy metal ions in the sample or excessive residue of EDTA-2Na, which increases the detection cost

[0006] In addition, the traditional diffuser and the scintillation chamber are made of rubber. Since silica gel and rubber can absorb radon gas, the use of rubber pipes will affect the measurement accuracy of radon gas, which in turn will affect the measurement accuracy of radium content.

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