Radon daughter sampling device based on high-voltage corona discharge

Abstract

The invention provides a radon daughter sampling device on the basis of the high-voltage corona discharge principle. According to the device, the traditional thinking is broken through from a radon daughter sampling mechanism. The device comprises a high-voltage electrode plate, a needle electrode, a sampling plate, a gold silicon surface semiconductor detector, a pre-amplifier, a fan, a sampling device upper cover and a bottom shell. The device is characterized in that a sampling filter membrane is not required, in the sampling process, the detector is not polluted, rapid and continuous measurement can be achieved, the device is small, exquisite in size and convenient to carry, the sampling sensitivity of the device is 4-8 times that of a common electrostatic collection method, and the radon daughter sampling device has the wide application prospect in the environment radon measuring fields of various low backgrounds.

Description

technical field [0001] The invention relates to a radon daughter sampling device, in particular to a radon daughter sampling device based on the principle of high-voltage corona discharge. Background technique [0002] radon (including 222 Rn and 220 Rn) is produced by the decay of radioactive substances such as radium, and is the only inert element in gaseous state among all natural radionuclides. Radon decay daughters are solid substances, these daughters are easily adsorbed on the surface of dust in the air, forming radioactive aerosols, and inhaled into the lungs with people's breathing, attached to the tracheal mucosa, resulting in long-term radiation damage in the body . According to the 2000 report of the United Nations Scientific Committee on Radiation Effects (UNSCEAR), about half of the natural radiation dose received by people comes from the contribution of radon and its progeny. The International Cancer Research Center of the World Health Organization has als...

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Problems solved by technology

[0006] The most important indicator for evaluating the performance of a radon measuring instrument is the measurement sensitivity, and the sensitivity of the radon measuring instrument depends on the sampling method it adopts. Among the existing radon measuring methods, except for the traditional filter sampling method used to measure the sensitivity of α daughter In addition to being relatively high, other commonly used sampling methods for radon measurement are at a low level in terms of measurement sensitivity, and there has been no substantial breakthrough for a long time

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