Hallett Radon Screening Service
About radon gas exposure levels:
| less than 4 pCi/L... |
that's good news, you probably have nothing to be worry
about. |
| from 4 to 20 pCi/L... |
you might have a problem, and the E.P.A. recommends
additional testing to be on the safe side. (see below) |
| from 20 to 200 pCi/L... |
you should take corrective action to reduce the level
of radon gas. |
| more than 200 pCi/L... |
you have a serious problem, and you should take immediate
corrective action. |
If your reading is more than 4 pCi/L, here are some options:
Re-test;
temporary atmospheric conditions, such as a low pressure system or high winds
can cause a temporarily higher than normal reading.
Perform seasonal
tests; the E.P.A. states "short term results from tests made during the cooler
months generally over- estimate annual levels by one to three times.
Perform a long
term (alpha track) test; because the charcoal canister screening is a short
term test. It has a logical limitation, in that it determines the radon level
during that short screening period, but cannot determine an annual average.
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