Set challenging conditions
- Test during reasonably worst case conditions, such as:
- Close windows & doors starting 12 hours before the test.
- Test in the lowest livable level, or even in the crawl space.
- Sample off the floor, away from windows.
- Test during calm weather; especially avoid windy days.
Measure the concentration level
Choose the best method of analysis, for either initial screening or long-term average:
- Test using a continuous monitor (“RnCM”, like the Professional Continuous Radon Monitor Model #1027, by Sun Nuclear Corp.) onsite (hourly readings, onsite readout), or
- Test using a continuous monitor in room air collected in air bags (fill several onsite, read with monitor in lab), and/or
- Test short-term average using passive activated charcoal samplers (“RnAC”, like by Air Chek) (exposed a minimum of 2 days onsite, better 4 days, then mailed to their lab in North Carolina) (these are good for many locations at once), or
- Test long-term average using an alpha-track (“RnAT”, like by RSSI) film badge for months.
- Test water samples collected for lab analysis.
Test again if levels high
- Test again in more and different locations, on upper floors also, to find the source:
- soil gases? (the most common source)
- interior masonry, granite, or rocks?
- well water?
- Test also to find the entry pathways: from the basement? (more in one end or corner?), the crawl space? the well water?
- Use your own direct reading continuous monitor Safety Siren SM-RAD-PRO3 for $130. from Safe Home Products, Inc.
Get more info from the US EPA.
©2004-2017 Richard Knights, Blue Sky Testing Labs, Seattle, firstname.lastname@example.org