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Technical Memoranda 45
Akber RA and Pfitzner JL
Supervising Scientist, 1994
ISSN 0810-9532
The results of atmospheric concentration measurements of radon and PAEC (total and unattached) for a one year cycle in Jabiru East in the northern tropical region of Australia are reported. The average annual radon and PAEC total concentrations are 39 ± 5 Bqm-3 and 3.5 ± 0.5 mWL respectively. The high unattached radon daughter fraction, annual average of 0.21 ± 0.03, is attributed to the low concentration of condensation nuclei, about (1.3 ± 0.3) × 103 # cm-3. Seasonal and diurnal variations are evident in these parameters. The unattached fraction is lower than average during the Dry season and also in the early morning when peaks occur in the radon and radon daughter concentrations. The condensation nuclei concentration and the equilibrium factor are higher than average during the dry months of the year.