PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
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Environmental radiation monitoring. Health Protection Agency worker using a monitor to test for radiation levels in a field. Most natural radiation is due to cosmic rays from space, and radon, a radioactive gas produced by the decay of radium from uranium ores. Human sources of radiation include nuclear power stations and pollution from coal-fired power stations. Photographed near the Firth of Forth in Scotland, with the Forth Bridge in the background.
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