In our recent article published in this journal,1 the equation we gave for the growth of 210Po on the surface of the foil erroneously assumes that at the start of exposure, , there is a fixed amount of 210Pb and no 210Po on the surface [see Eq. (1) and Table I]. In reality, at the start of exposure, there is neither 210Pb nor 210Po on the sample. During exposure, the 210Pb activity grows and simultaneously decays to 210Po (neglecting 210Bi due to its much shorter half-life). Following exposure, the time-dependent 210Po activity can be separated into two parts: the decay of 210Po on the foil at the end of exposure (), and 210Po growing in from 210Pb. The result is that Eq. (1) should be modified to read...
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