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Japanese Nuclear Emergency: Radiation Monitoring

RadNet Data for Dutch Harbor, Alaska

EPA no longer updates the information at this link, but it may be useful as a reference or resource. This site contains information and data from March 11, 2011 to June 30, 2011. EPA has returned to routine RadNet operations. This site will continue to be available for historical and informative purposes.

For real-time air monitoring data, please visit the EPA RadNet website and Central Data Exchange. To view both current and historical laboratory data, please visit our Envirofacts database.

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This page shows multiple types of data from this location, including the gross gamma exposure rate readings from our near-real-time air monitor and data from the detailed laboratory sample analysis. Gamma monitoring results are presented because they are a useful indicator of the radionuclides associated with a nuclear power incident.

Gamma Exposure Rate Air Monitoring Data

To-date, levels recorded at this monitor have been thousands of times below any conservative level of concern.

Dutch Harbor, AK - Gamma Exposure Rate

The graph shows the external exposure rate data, which is the dose, or amount of radiation, you would receive on the outside of your body if you were standing in that particular location. Background, or normal, radiation levels depend on factors including altitude and the amount of naturally occurring radioactive elements in the soil. Background external exposure rates typically range between 0.005 and 0.020 millirem per hour (mR/hr) - levels that are thousands of times below any conservative level of concern.

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Laboratory Data from Air Filter and Air Cartridge

During detailed filter analyses from several RadNet air monitor locations across the nation, the U.S. Environmental Protection Agency (EPA) identified trace amounts of radioactive isotopes consistent with the Japanese nuclear incident. These types of findings are to be expected in the coming days and are far below levels of public health concern.

About air filter and air cartridge laboratory data

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