Accumulation adsorption type soil radon rapid measurement device of radon daughter board card

Abstract

The invention provides an accumulation adsorption type soil radon rapid measurement device of a radon daughter board card. The device is characterized in that the device comprises a radon daughter accumulation adsorption board card and a radon daughter surface pollution measurement device; the radon daughter accumulation adsorption board is made of thin board type plastic materials which are capable of well adsorbing radon daughters; during measurement, the radon daughter accumulation adsorption board is embedded into the soil firstly so as to adsorb radon daughters for over 4 hours; then, theradon daughter accumulation adsorption board is taken out and placed on a special tray; the detection face of the radon daughter surface pollution measurement device is closely attached to the radondaughter accumulation adsorption board card; the radon daughters adsorbed on the radon daughter accumulation adsorption board card decay to generate alpha rays; the alpha rays penetrate through a thinaluminum film closely attached to the radon daughter surface pollution measurement device and then hit a ZnS(Ag) plastic scintillation detector so as to generate light; the generated light is collected and transmitted to a photomultiplier through air light guide and then is subjected to photoelectric conversion by the photomultiplier; and then, a following detection circuit records the information of the alpha rays, and corresponding radon concentration is calculated through conversion according to scale coefficients, thereby achieving rapid measurement of the radon in the soil.

Description

technical field [0001] The invention relates to the measurement field, in particular to a soil radon rapid measurement device, which solves the engineering problems of soil radon measurement site work efficiency and background pollution, and provides a fast, convenient and reliable measurement scheme and technical means for soil radon measurement. Background technique [0002] Radon is a trace element, and radon gas measurement technology in soil is widely used in resource exploration, geological structure exploration, ground subsidence exploration and coalfield underground natural area exploration and other fields. Radon is a radionuclide. Once inhaled into the human body, it will cause damage to the human lungs and increase the possibility of inducing lung cancer. It is one of the main pollutants harmful to the human body in the environment. [0003] At present, radon gas measurement technology can be divided into cumulative method measurement and instantaneous method meas...

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Problems solved by technology

In the thorium-based decay chain, although there are long-lived daughters 212 Pb (with a half-life of 10.64h), 212 Bi (half-life 60.6m), but due to its parent 220 The Rn diffusion distance is short, and the α cup is embedded for a short time (several hours), the adsorption amount on the α cup body will be very small, and it can be ignored during the measurement process

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