Radon Measuring Device Based on Electrostatic Collection Method Based on Semiconductor Refrigeration Technology
An electrostatic collection method and semiconductor technology, applied in the field of radon measuring instrument, can solve the problems of reducing the performance requirements of semiconductor detectors and amplifying circuits, reducing the cost of instruments, etc., and achieve the effect of improving portability, reducing instrument costs, and avoiding temperature drift problems
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Embodiment 1
[0032] As an online continuous radon meter. The sampling pumps 2 work continuously, and stably send the sample gas to the collection chamber 5 after passing through the filter membrane 1 . The temperature of the collection chamber 5 is controlled in a small temperature range slightly higher than 0° C., such as 1° C.±0.5° C., but not limited to this temperature range. After the sample gas reaches the collection chamber 5, the temperature drops rapidly, resulting in supersaturation of water vapor, and most of the water vapor condenses. Condensed water can flow along the four walls of the collection chamber 5 to the exhaust port at the bottom of the collection chamber, and be discharged from the collection chamber 5 and the instrument along with the gas. The water content of the gas in the collection chamber is greatly reduced, and the absolute amount of water contained can be reduced to 5g / m 3 At this time, the influence on the collection efficiency is very small.
[0033] A fa...
Embodiment 2
[0038] As a portable radon meter, it works in intermittent mode.
[0039] Since the sampling pump 2, the hot side 3 of the semiconductor cooler, the cold side 4 of the semiconductor cooler and its cooling fan work intermittently, it can save power and reduce the consumption of sample gas, but the working process is a little more complicated.
[0040] The instrument starts to measure, the sampling pump 2 works for a period of time, and the sample gas enters the collection chamber 5 after passing through the filter membrane 1. After ensuring that the gas in the collection chamber 5 is replaced with the sample gas to be measured, the sampling pump 2 stops working, and the semiconductor manufacturing The cooling plates (3 and 4) start to refrigerate, reducing the temperature of the radon collecting chamber 5 to a small temperature range near 0°C, such as (-3°C--1°C).
[0041] A fan is installed on the radiator and runs synchronously with the semiconductor cooler to reduce the temp...
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