RADIOLOGICAL POSTINGS

Used to alert people to the presence of radiation and/or radioactive materials

Inform workers of radiological conditions to aid in minimizing their exposure

Provide radiological area entry requirements

Help prevent the spread of contamination

Note: In the case of a radiological accident, conditions may have changed from what are indicated on the postings.

Radiological hazards and areas controlled for radiological protection purposes are labeled or posted with a magenta (or black), three-bladed radiological warning symbol (or “trefoil”) on a yellow background.

Additionally, yellow and magenta ropes, tapes, chains, or other barriers are used to mark the boundaries.


Radiological posting information includes:

Radiological warning word, such as “Caution," to indicate the level of hazard

Trefoil symbol

Listing of all radiological hazards in the area

Postings may also contain information on:

Specific radiation dose rate or contamination level

Entry requirements. Radiation Levels 10 mSv/hr General Area

First responders do not have to obey radiological controls entry requirements during an emergency.

However, in ALL cases you should be aware of the postings and the information provided.


IAEA Postings

Controlled Area

Any area in which specific protective measures or safety provisions are, or could be required for:

Controlling normal exposures or preventing the spread of contamination during normal working conditions.

Preventing or limiting the extent of potential exposures.

Controlled Area
Required to delineate the area (rope)
Display approved signs at access points
Periodically review conditions to ensure adequate personnel protection and controls
Use administrative controls to control to restrict access

Supervised Areas

Areas not designated as a Controlled Area but review for controls may be needed but protection of workers is not required

Posted
Signs
Periodic review of conditions

U.S. Radiological Postings

Radiological areas may be one of three general types:

CONTAMINATION
RADIATION
AIRBORNE CONTAMINATION

When entering a Radiation or High Radiation Area, wear a TLD (or other personal monitoring device) if possible. A Radiation Protection Specialist with a dose rate meter should accompany you. Do not enter Very High Radiation Areas without specific approval! When entering a Contamination , When entering an Airborne Radioactivity Area,
Area seal the openings of your seal the openings of your turnouts with tape
turnouts or clothing with tape. and use a respirator, if available.