Our Lucas-cell systems are readily applied to sniffing or searching for radon and thoron entry points in buildings. We supply sections of flexible and rigid tubes which connect to the Lucas cell inside our portable radon monitor. This allows you to reach under furniture and appliances and inside closets and cupboards etc. Our internal pump provides a constant flow into the Lucas cell. You can detect hot spots immediately by watching the counts accumulate on the display or by watching the display flashing. For more accurate readings you can count for a few seconds. With its 55-second half-life thoron can easily be recognized by a drop in count rate over the first minute or two. The limit for radon in houses is about 1 cpm on our Lucas cell. The hot spots you're looking for are much higher than that (because of dilution and decay), so a few seconds will suffice. If you find a few extra counts pump again and move a few inches. It's an ideal system for remediation work. Besides finding hot spots or entry points the same Lucas-cell system can also be used as a monitor for accurate determination of the average long-term radon level, which is a health concern. We have laboratory-grade portable instruments with numerous capabilities. Our PMT radon monitor features a photomultiplier tube with detectors including Lucas cell for radon gas and scintillation discs for radon daughters. Our solid state monitor measures radon and thoron daughters. It is programmable and suitable for working level and other reporting methods. Robert H. Morse, Ph.D., P.Eng., November 2014 For instruments contact R.H. Morse & Associates Ltd. 1-416-269-9979 morse@finderschoice.com Click here for other applications of our radon instruments. Copyright 1968 - 2022, R. H. Morse & Associates Ltd., All Rights Reserved