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Dynamic control method of radon concentration of gas-flow type radon chamber

A control method and radon concentration technology, which is applied in the field of radioactive gas concentration control, can solve the problems of reduced radon concentration stability, shortened service life of radon source control valves, frequent curve oscillations, etc.

Inactive Publication Date: 2008-12-10
EAST CHINA UNIV OF TECH
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Problems solved by technology

[0003] However, in the measurement of radioactivity, due to the statistical fluctuation of radioactivity, the radon concentration value measured by the measuring instrument often has a large deviation from the actual value
If PID control is used, it will inevitably lead to frequent oscillation of the curve, which will reduce the stability of radon concentration.
At the same time, due to frequent switching between radon supplementation and stopping radon supplementation, the service life of the radon source control valve will also be shortened

Method used

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  • Dynamic control method of radon concentration of gas-flow type radon chamber
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  • Dynamic control method of radon concentration of gas-flow type radon chamber

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[0029] attached figure 1 Shown is a kind of embodiment that utilizes the present invention to carry out the automatic dynamic control of the radon concentration in the convection air type radon room, and the specific operation steps are as follows:

[0030] (1) Release the radon radioactivity accumulated in the radon source to ensure the stability of radon supplementation from the radon source to the radon chamber in subsequent operations.

[0031] (2) At the same time, use measuring instruments, such as FD-125 radon thorium analyzer and FH-463 type α detector, to measure the initial activity value Q of radon in the radon room 0 .

[0032] (3) Determine the expected value Q of the radon activity in the radon room and the maximum deviation ε of the activity allowed;

[0033] (4) Calculate the control time t 0 , t 1 and t 2

[0034] For a new radon chamber, it is necessary to first calculate the leakage rate λ of the radon chamber L and the effective intensity I of the ra...

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Abstract

The present invention relates to a method for controlling the concentration of radioactive gas, in particular to a method for controlling the radon concentration of a gas-flow radon chamber. The method has the following characteristics: after setting the radon activity value of the radon chamber and the allowed error and measuring a background activity value in the radon chamber, the method calculates the first radon filling time (t0), the elapsed time (t1) of the disintegration of radon activity in the radon chamber from the allowed highest value to the allowed lowest value and the elapsed time (t2) in which a stable radon source is used to fill radon into the radon chamber from the allowed lowest value to the allowed highest value; using time as a control parameter in deciding if radon is filled into the radon chamber or not can not only ensure that the filling of radon in the radon chamber cannot be affected by the fluctuation of radon radioactivity statistics, but also prevent the control valve of the radon source from being frequently opened and closed by the fluctuation of radon radioactivity statistics. Moreover, since time is used as the control parameter, operation is simple and convenient, and the automation of operation and control can be easily realized. The method is widely applicable to the accurate control of radon concentration in various gas-flow radon chambers.

Description

technical field [0001] The invention relates to a method for controlling the concentration of radioactive gas, in particular to a method for dynamically controlling the concentration of radon in a flow-type radon chamber according to the law of decay and leakage of radon. Background technique [0002] In engineering practice, the most widely used regulator control law is proportional, integral, differential control, referred to as PID control, also known as PID regulation. It has been nearly 70 years since the PID controller came out. It has become one of the main technologies of industrial control because of its simple structure, good stability, reliable operation and convenient adjustment. When the structure and parameters of the controlled object cannot be fully grasped, or the accurate mathematical model is not available, making it difficult to adopt other techniques of control theory, the structure and parameters of the system controller must be determined by experience...

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Application Information

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IPC IPC(8): G05D11/02
Inventor 汤彬周书民张锦由王仁波
Owner EAST CHINA UNIV OF TECH
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