According to regulations, a radiation area requiring a sign with the radiation symbol and the words "CAUTION RADIATION AREA" is required where individuals could receive a dose equivalent to

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In posting of radiation areas, the licensee shall post each radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, RADIATION AREA." Radiation area means an area, accessible to individuals, in which radiation levels could result in an individual receiving a dose equivalent to in excess of 0.005 rem (0.05 mSv) in 1 hour at 30 cm from the radiation source or from any surface that the radiation penetrates.

According to Regulations, a Radiation Area Requiring a Sign with the Radiation