How to Test
Buildings for Radon
Protocols: Placement protocols vary from state to state.
Most states instruct people testing large buildings to:
radon detectors in every frequently occupied room where the
floor has contact with the soil.
radon detectors in the breathing zone, 2-6 feet above the
floor, and away from drafts, exterior walls, windows, sumps,
drains or doors.
one radon detector for every 2000 square feet in large rooms.
Assurance and Control: Some states require testers and
mitigators to follow some or all of the quality assurance
tests where two radon detectors are placed in the same
location. This tests to see if the analysis process is
producing consistent results. Usually, duplicates are
placed in one of every ten locations.
detectors are radon detectors that are not opened until just
before they are returned. Blank radon detectors test to
see if the analysis process can distinguish between tracks
caused by radon and background. Frequently, the number
of blanks must equal at least 3% of the total detectors.
detectors are exposed in a certified radon chamber. This
tests to see if the analysis process is producing accurate
results. State regulations indicate the number of spikes
to be tested annually.
blank and spike QC tests should be labeled so that the
analysis lab does not know which detectors are QC tests.
and Licensing: Each state has regulations for radon testing and
mitigation. These regulations do not apply to homes owned or
occupied by the tester. Regulations vary among:
with no regulations
that require testers and mitigators to be certified by a national
that require testers and mitigators to be licensed by the
that require a separate certification for testing schools or
regulations do not apply to federal property.
radon office to learn about the requirements that apply to
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