Device and method for measuring ionization rate of water vapor molecules in air
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A water vapor and ionization rate technology, which is applied in the field of nuclear radiation measurement, can solve the problems of inability to be collected, unable to detect alpha particles, and reduced collection efficiency, and achieve the effect of simple and easy operation of the measurement device
Active Publication Date: 2021-08-17
HENGYANG NORMAL UNIV
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It is generally believed that the main reason for the decrease in the collection efficiency of the electrostatic collection method is the positively charged Po-218 and the OH produced by ionization in the air. - After the ion combination becomes electrically neutral, it cannot be collected on the surface of the detector, so the detector cannot detect the alpha particles produced by the decay of Po-218
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Embodiment 1
[0049] Embodiment 1. The device for measuring the ionization rate of water vapor molecules in the air includes a measuring box 1 , a radon chamber 2 , a pump 3 , a high pressure module 4 , a first regulating valve 5 and a second regulating valve 6 .
[0050] The measuring box 1 is a rectangular box body, the box body is a measuring cavity, and the length, width and height of the measuring cavity are L respectively 1 , L 2 , L 3 , the side walls around the box are made of plastic material, and the first joint 1-4 and the second joint 1-5 are respectively provided on the two corresponding side walls of the box, and the panel 1-1 and the bottom plate 1-2 of the box are both It is a conductive metal plate, and a circular semiconductor detector 1-3 with a radius R is arranged on the panel 1-1.
[0051]The first joint 1-4 of the measuring box 1 is connected with one end of the first regulating valve 5 through a pipeline, and the other end of the first regulating valve 5 is connect...
Embodiment 2
[0054] Embodiment two, adopt the method for measuring the ionization rate of water vapor molecules in the air by the device measuring the ionization rate of water vapor molecules in the air as described in embodiment one, including measurement process and calculation process, and its specific operation process is as follows:
[0055] A. Measurement process:
[0056] Under constant temperature and humidity conditions, open the first regulating valve 5, the second regulating valve 6 and the pump 3, the air in the radon chamber 2 is pumped into the measuring cavity of the measuring box 1 through the pump 3, and the radon and its The sub-body is sent to the measurement chamber, after a period of time to mix evenly, the first regulating valve 5, the second regulating valve 6 and the pump 3 are closed, the high-pressure module 4 is opened, and in the measuring chamber of the measuring box 1, the panel 1- A uniform electrostatic field is formed between 1 and the bottom plate 1-2, and...
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Abstract
The invention discloses a device and a method for measuring the ionization rate of water vapor molecules in air. The measuring device comprises a measuring box, a radon chamber, a pump and a high-pressure module. The measuring box is a rectangular box body, a first joint and a second joint are respectively arranged on two corresponding side walls of the box body, a panel and a bottom plate of the box body are both conductive metal plates, and a circular semiconductor detector is arranged on the panel. A first connector of the measuring box is connected with a first connector of the radon chamber, a second connector of the measuring box is connected with one end of the pump, the other end of the pump is connected with a second connector of the radon chamber, a panel of the measuring box is connected with a cathode of the high-voltage module, and a bottom plate of the measuring box is connected with an anode of the high-voltage module. During measurement, the high-voltage module is turned on, a cylindrical uniform electrostatic field is formed between the detector and the bottom plate, positively charged Po-218 is collected to the surface of the detector, the collection efficiency of the Po-218 under different voltages is obtained, the collision frequency of the Po-218 and OH<-> and the value of the composite probability of the Po-218 and OH<-> are obtained through fitting, and then the ionization rate of water vapor molecules in air is obtained through calculation.
Description
technical field [0001] The present invention relates to a kind of nuclear radiation measuring technique, especially a kind of measuring hydroxide (OH) in the air - ) device and method for ion concentration. Background technique [0002] Po-218 (RaA) is formed by the decay of radon and is also radioactive. After inhalation, it will cause internal exposure to the human respiratory system. Therefore, its physical and chemical properties are very important for understanding the behavior of daughter bodies in indoor air. Po-218 produced after radon decay was found to be 88% positively charged ions. It is generally believed that the main reason for the decrease in the collection efficiency of the electrostatic collection method is the positively charged Po-218 and the OH produced by ionization in the air. - The ions bound to become neutral cannot be collected on the surface of the detector, so the detector cannot detect the alpha particles produced by the decay of Po-218. Ther...
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