Captive balloon measurements of radon 222 and its daughter ions |
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| Authors: | Amiram Roffman |
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| Institution: | (1) New Mexico Institute of Mining and Technology, 87801 Socorro, New Mexico, U.S.A. |
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| Abstract: | Summary An instrument for use with a captive balloon has been developed for the investigation of the vertical distribution of222Rn and its daughter ions of high mobility. The system consists of a light weight ion collector of the Gerdien type and an automatic air sampler. Simultaneous collections of222Rn and its daughter ions having mobilities of known limits makes it possible to determine the concentration of the radioactive ions relative to the ambient concentration of222Rn in different atmospheric conditions in the air layer adjacent to the ground where aircraft and tower measurements are not practicable. Vertical profiles taken over a mountain ridge in a well-mixed atmosphere show almost constant concentrations of222Rn and its daughter ions with altitude. In some cases a slight increase in the concentrations of222Rn and its daughter ions with altitude has been observed. The radioactive ion concentration relative to the ambient concentration of222Rn in the boundary layer is of the order of 3%. |
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