Determination of radon in air
阅读：322发布：2020-08-21
专利汇可以提供Determination of radon in air专利检索，专利查询，专利分析的服务。并且This invention relates to a device and method for measuring the amount of radon present in the air. A silicon diode detector system operates in helium at atmospheric pressure, and an alpha spectra is obtained that can be analyzed for the radon activity. The invention facilitates radon concentration measurements in the many widely scattered localities in the biosphere where these measurements are of interest, such as in uranium mines, coal mines, and in the lower atmosphere.，下面是Determination of radon in air专利的具体信息内容。
1. A device for measuring the amount of radon present in the air comprising a detector chamber provided with an open end, an alpha particle detector mounted within said chamber with the face thereof positioned parallel to and adjacent to the open end of said chamber, a movable plate provided with at least one recessed depression therein and mounted flush with said chamber open end, said plate depression being adapted to be positioned in a sample loading position or in a position in axial alignment with said chamber, a sample holder with a sample filter adapted to be placed within said plate depression at its loading position such that the face of said sample filter is at a desired minimum distance from said detector face when said plate depression is positioned in alignment with said chamber, a source of helium, and said detector chamber being coupled by means connected to said helium source and to the atmosphere and communicating therewith such that helium is adapted to flow through said chamber and into the atmosphere during a detection operation, whereby during said operation said detector provides an output for obtaining an alpha spectra in accordance with the decay products from said sample filter thereby permitting a determination of the original radon concentration of the sampled air.
2. The device set forth in claim 1, wherein said means fOr coupling said detector chamber to said helium source and then to the atmosphere includes a tank encompassing all of said chamber except the open end thereof, said chamber being provided with an entrance aperture and an exit aperture communicating with the interior of said tank, said tank being supported by means of a plurality of vertical posts affixed thereto, a control valve, means for connecting said valve between said helium source and the interior of said tank, a glass beaker containing oil supported on and to the exterior of said tank, and a tube communicating with the interior of said tank and extending within said beaker below the oil level therein, whereby said helium is adapted to flow through said valve, through said tank and detector chamber and then bubble through said beaker oil into the atmosphere during operation of said device.
3. The device set forth in claim 2, wherein said tank is provided with a recessed slot portion for defining said sample loaidng position of said movable plate, whereby said sample holder with its sample filter may be readily placed into or removed from said recessed plate depression when it is in its loading position.
4. The device set forth in claim 3, wherein said movable plate is provided with at least two or more recessed plate depressions for receiving respective additional sample holders with sample filters, said movable plate being generally circular and being held in place flush with the bottom of said tank by means of a bolt extending through the center of said tank and threaded into said plate, whereby said plate is adapted to be rotated about the axis of said bolt by a rotation thereof for the sequential positioning of each of said plate depressions in line with the open end of said detector chamber while at the same time one of the other plate depressions is at its sample loading-unloading position.
5. The device set forth in claim 4, wherein said detector is a silicon surface-barrier diode.
6. The device set forth in claim 5, wherein said sample filter is a micropore filter of about 0.45 micron diameter pore size.
7. The device set forth in claim 6, wherein said detector diode has a sensitive area of 4 cm2, and said minimum distance between the face of said detector and said sample filter during operation of said device is about 5.25 mm.
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