Restricted Areas and Precautionary Procedures

Restricted Areas and Precautionary Procedures

Key Facts

U.S. NRC Regulations (10 CFR) Part 20: Standards for Protection Against Radiation, Subpart G

• Control of exposure from external sources in restricted areas

“CAUTION, RADIATION AREA”

– Posted in all areas where it is possible for individual to receive dose > 5 mrem (0.05 mSv) in any 1 hour at 30 cm from radiation source

Licensee shall post each airborne radioactivity area with conspicuous sign or signs bearing radiation symbol and “CAUTION, AIRBORNE RADIOACTIVITY AREA” or “DANGER, AIRBORNE RADIOACTIVITY AREA”

Licensee shall post each area or room in which there is used or stored amount of licensed material with conspicuous sign or signs bearing radiation symbol and “CAUTION, RADIOACTIVE MATERIAL(S)” or “DANGER, RADIOACTIVE MATERIAL(S)”

Unrestricted area has dose rate of < 2 mrem (0.02 mSv) in any 1 hour and < 100 mrem (1 mSv) in 1 year

– Reception area and waiting room

– File room

– Bathroom

– Hallways

Restricted areas have dose rates exceeding those of unrestricted area limits and require control of access and not accessible to public

– Byproduct material will be received, prepared, used, administered, and stored

Licensee shall use, to extent practical, process or other engineering controls (e.g., containment, decontamination, or ventilation) to control concentration of radioactive material in air

Key Images

The patient imaging area is a restricted area. A patient is shown being scanned on a SPECT/CT camera. Proper signage is required on the entrance door.
Radiation area implies that an individual may receive a dose > 5 mrem (0.05 mSv) in any 1 hour at 30 cm from the radiation source. This is the door to a SPECT/CT room where radiopharmaceuticals are also administered so a radioactive materials sign was also placed.
The door to the nuclear medicine hot lab should have restricted access by lock and key, badge access, or keypad.
Hallways of the nuclear medicine department are generally unrestricted areas. The dose rate must be < 2 mrem (0.02 mSv) in any 1 hour and <100 mrem (1 mSv) in 1 year.

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Tags: Diagnostic Imaging Nuclear Medicine

May 7, 2023 | Posted by admin in CARDIOVASCULAR IMAGING | Comments Off

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