Radon detector setup

A man wearing sun protection gear stands in water near a tropical beach holding onto equipment attached to a flotation device.

Detailed Description

USGS physical scientist Cordell Johnson installs a special buoy in the waters of the National Park of American Samoa on Ofu in the Manu Ľa Islands Group, American Samoa. The special buoy, developed by USGS scientists, measures radon on the reef. Radon is a marker of submarine groundwater discharge that brings low-salinity waters, and sometimes nutrient- and contaminant-laden waters, to the coral reefs.


Image Dimensions: 1500 x 1125

Date Taken:

Location Taken: AS