United States Nuclear Regulatory Commission - Protecting People and the Environment
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High radiation area

Any area with dose rates greater than 100 millirems (1 millisievert) in one hour 30 centimeters from the source or from any surface through which the ionizing radiation penetrates. Areas at licensee facilities must be posted as "high radiation areas" and access into these areas is maintained under strict control.

Page Last Reviewed/Updated Wednesday, April 02, 2014