U.S. Geological Survey

Radon Potential of the Upper Midwest


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TABLE 1. RADON INDEX MATRIX


POINT VALUE
FACTOR123
INDOOR RADON (average)< 2 pCi/L 2 - 4 pCi/L > 4 pCi/L
AERIAL RADIOACTIVITY < 1.5 ppm eU 1.5 - 2.5 ppm > 2.5 ppm
GEOLOGY negative variable positive
SOIL PERMEABILITY low moderate high
ARCHITECTURE TYPE mostly slab mixed mostly basement

SCORING:

probable screening
Rn potential category point range indoor Rn average
LOW 3-8 points < 2 pCi/L
MODERATE 9-11 points 2 - 4 pCi/L
HIGH 12-17 points > 4 pCi/L


TABLE 2. CONFIDENCE INDEX MATRIX


POINT VALUE
FACTOR123
INDOOR RADON DATASparse/no datafair coverage/qualitygood coverage/quality
AERIAL RADIOACTIVITYquestionable/no dataglacial coverno glacial cover
GEOLOGIC DATAquestionablevariableproven geol. model
SOIL PERMEABILITYquestionable/no datavariablereliable, abundant

SCORING:

LOW CONFIDENCE4 - 6 points
MODERATE CONFIDENCE7 - 9 points
HIGH CONFIDENCE10 - 12 points

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13 October 1995