Radiation visualization mapThis map was generated from data from the EPA provided RadNet. This map was created by graduate students Kevin Peter Hickerson and Riccardo Schmid at the California Institute of Technology in the Kellogg Radiation Laboratory.How to read this mapThe map shows the intensity of atmospheric radiation relative to the normal levels. The area and color of each circle on the map represents the total measured radiation relative to normal levels from each RadNet station. A reading of 1.0x would mean levels of radiation in the air are normal. A reading of 2.0x would indicate that radiation in the air is twice the normal rate.LegendRelative radiation level: |
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About the dataThe EPA has a number of radiation monitors around the United States that measure the release of energy from radioactive isotopes in the air. Data from each station that is reporting to RadNet are collected and used to compute the radiation in total counts per minute. This data is visually represented by a circle centered on the station's locationand is updated hourly. The area and color of each circle are based on the ratio of the beta and gamma radiation readings in counts per minute (cpm). The measurement in cpm is then divided by normal readings from the same detector from before the Fukushima-Daiichi event. Some detectors report more often than others, so we use the most recent data available.
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© 2011 Kevin Hickerson