Abstract
Abstract A method for the direct determination of radon in the atmosphere was developed to measure radon mixing ratio with high precision at the low levels found in the marine troposphere away from continental air mass contamination. Developed for the DYCOMS atmospheric dynamic and chemical measurement experiment over the eastern Pacific Ocean during July and August, l985 it combines scintillation cell counting with the collection of large volume air samples using low flying aircraft. An equation that combines the growth and decay of radon and radon progeny was written for a microcomputer and is used to compare alpha activity in the cell with the number of radon atoms in a sample. Radon mixing ratios as low as 12 atoms per liter of air have been measured using this method.
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