Development Proposal for Arsenic Contamination in the Ganges Delta Region
Department of Geology and Geography
Denison University, Granville, Ohio 43023
This study investigates the geologic factors affecting radon concentrations in buildings in the villages of Granville and Alexandria, Licking County, central Ohio. The source of most of the radon is the decay of uranium in the Raccoon Shale, a black marine shale that is found at depth throughout the area. This rock type is not commonly exposed as outcrop, but was probably spread throughout the study area by glaciers that moved in the Pleistocene Epoch. Results of this study indicate that Wisconsin-age glacial deposits are the key geologic factor controlling indoor radon concentrations. Outwash terraces and ground moraines were correlated with the highest radon measurements. Sites located on the tops of hills are also linked to high indoor radon levels. These geologic conditions seem to have a high radon potential, and buildings located on these geologic formations appear to be especially vulnerable to developing high concentrations of indoor radon. Residents are advised to be particularly cautious about their long-term exposure to radon gas.