Decay Rate of Radon-222 as a function of date and time of day. The color-bar gives the power of the observed signal.
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Public domain
Public domain
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This photograph was produced by the
Atmospheric Radiation Measurement
Program.
Their site states:
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Any of the below images or graphics may be reproduced and published at your discretion. Please use the following credit line: "Courtesy: U.S. Department of Energy's Atmospheric Radiation Measurement Program."
Additionally, the ARM program is part of the
U.S. Department of Energy
, whose images are in the
public domain
in the United States.
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