Figure 5.1

Average values of the activity fractions for each of the decay products and for PAEC (no smokers present). The error bars indicate the standard deviations of the 20 distributions that comprise the average.

has left the area. Thus, exposure to the 222Rn decay products is much lower than would be expected based on radon itself.

The Fitzgerald and others (1997) study used a normally occupied dwelling that was supplied with water from a well; the water contained radon at 518,000–555,000 Bq m-3. The dwelling was a one-story wooden house of a type common in northern New York state. Details of the measurement methods for radon and



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