Figure 5.2

Average values of the activity fractions for each of the decay products and for PAEC (smokers present). The error bars are as in figure 5.1.

its decay products are provided by Fitzgerald and others (1997). Figure 5.3 shows the radon concentration as a function of time under several ventilation conditions. Figure 5.4 shows the evolution of PAEC as a function of time in one experiment.

The growth of the aerosol particles means that any calculations of dose must allow for the possibility of hygroscopic growth of the particles, such that the aerosol size spectrum and hence the activity-weighted size spectrum might shift

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