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*Below detection limits.

tAs determined through presence of short-lived Rn222 daughters.

*Below detection limits.

tAs determined through presence of short-lived Rn222 daughters.

tilated buildings. Radon originates from the radioactive decay of uranium, thorium and/or radium (Figure 11.22.3). The EPA states that levels above four pCi/L should be reviewed for possible corrective actions (Boyle 1988). (See Sections 5.31 and 5.32 for further information on this subject.)

FIG. 11.22.3 Areas with potentially high radon levels. (Reprinted, with permission, from M. Boyle, 1988, Radon testing of soils, Environmental Science Technology [22(12):1397-1399].)
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