Abstract
Because aerial gamma-ray measurements of equivalent uranium are an indirect measure of radium-226 and a direct measure of bismuth-214, which is a daughter isotope separated from radon-222 by short-lived isotopes of polonium and lead, gamma-ray data can be used to estimate the relative amounts of radon in soil gas. Theoretical calculations are available that enable an interpreter to define the limitations on the coverage provided by an aerial survey. Aerial survey data for the State of New Jersey are compared to indoor radon measurements. The results of this comparison support the use of aerial gamma-ray data to estimate the relative concentrations of radon in soil gas, and published data comparing radon concentrations in soil gas to surface gamma-ray measurements provide corroborating evidence. The application of Swedish criteria for assessing radon hazards to the data for New Jersey suggests that hazard-assessment criteria from one area may not be correct for other, geologically different areas.
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