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Radiation Protection Dosimetry 7:121-125 (1984)
© 1984 Oxford University Press

Measurements of Radon Daughter Particle Size

E.O. Knutson, A.C. George, R.H. Knuth and B.R. Koh

Measurements made in our laboratory using three types and sizes of diffusion batteries and two cascade impactors show that the particle size distribution of the potential alpha energy concentration (PAEC) is usually bimodal. The major mode, comprising 85-100% of the PAEC, is well defined and centred at about 100 nm in diameter. The minor mode, comprising the balance of the PAEC, varies in location from below 5 nm to about 10 nm. The particle size of the minor mode appears to correlate to the 'age' of the 218Po. The impactor tests conducted show that in our laboratory's environment <16% of the PAEC resides on particles >0.6 µm in diameter.


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