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Radiation Safety Training Module
Radiographic Sciences and Analytical X-ray Machines
Study Guide
ISU Technical Safety Office, Campus Box 8106
Pocatello, ID 83209
(208) 282-2311/2310

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Classification of areas

Controlled Area: Any area, to which access is limited for any reason.  X-ray rooms and accelerator rooms are controlled administratively by the personnel who operate the equipment.  


Restricted Area: An area, to which access is limited for the purposes of protecting individuals against undue risks from exposure to radiation and radioactive materials.  It is an area that is defined by a responsible user to the purposes of working with radioactive materials or radiation producing machines.  An area must be posted as a Restricted Area if the dose rate is >2 mrem/hr  A Restricted Area will have some type of marked or physical boundary so that untrained personnel will be prevented from accessing the area.






Radiation Area:  Any accessible area in which an individual could receive a dose equivalent exceeding 5 mrem in 1 hour at 30 cm (1 ft) from the source or from any surface the radiation penetrates.

                                                                  


High Radiation Area:  Any accessible area in which an individual could receive a dose equivalent exceeding 100 mrem in 1 hour at 30 cm (1 ft) from the source or from any surface the radiation penetrates.

Very High Radiation Area: Any accessible area, in which radiation absorbed dose exceeds 500 rad in 1 hour at 1 meter (3.28 ft) from the source or from any surface the radiation penetrates.
 

Posting

For rooms containing X-ray machines "CAUTION X-RAY EQUIPMENT" label should be used.
 
If any dose rate exceeds 2 mrem in any one hour at 30 cm (1ft.) from an accessible source or surface, the room shall be posted as a "RESTRICTED AREA" to prevent entry of unauthorized individuals.  If any dose rate exceeds 5 mrem in any one hour at 30 cm (1ft.) from an accessible source or a surface, the room must be labeled with a "CAUTION RADIATION AREA" sign. 

A "NOTICE TO EMPLOYEES", available from the RSO, must be posted in a location clearly visible to anyone entering the laboratory.




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