A posting level under US rules for areas where dose rates could exceed 100 mrem (1 mSv) in one hour at 30 cm from the source. Entry needs an RWP, a briefing, and an alarming dosimeter or continuous RP coverage. Above that, locked high radiation areas (typically over 1 rem per hour) need locked doors and tighter key control, and very high radiation areas cover fields above 500 rad in an hour at 1 m.
Regen heat exchanger room is a locked high radiation area, get the key from RP and a briefing first.
Also heard as
- HRA
Related terms
Controlled area
A designated zone where specific radiation protection rules apply to control exposure and the spread of contamination.
RWP
Radiation work permit: the document that sets radiological conditions, controls and dose limits for a specific job.
EPD
Electronic personal dosimeter: a worn device that shows dose and dose rate live and alarms at set points.
Time, distance, shielding
The three basic ways to cut external dose: spend less time near a source, stay farther away and put material in between.