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Radiation Warning Symbol

Radiation Warning Symbol is easily recognizable symbol designed to warn about radioactive materials or locations. The use of radiation warning symbol is regulated by CNSC. The international radiation symbol (also known as trefoil) first appeared in 1946. The appropriate CNSC radioisotope signage and safety poster corresponding to the classification of the area, room or enclosure must be kept posted in a readily visible location.

Frivolous Posting of Signs

Radioactive warning signs shall NOT be posted in locations or on equipment where radiation is not present. Section 23, Radiation Protection Regulations prohibits the frivolous posting of signs. All such signs and labels shall be removed.

Do you require a Radiation Warning Symbol in your lab?

According to CNSC  Radiation protection regulation (section 20,21 and 22), every licensee shall post and keep posted, at the boundary of and at every point of access to an area, room or enclosure, a durable and legible sign that bears the radiation warning symbol set out in Schedule 3 and the words “RAYONNEMENT-DANGER-RADIATION”, if
there is a radioactive nuclear substance in a quantity greater than 100 times its exemption quantity (EQ) in the area, room or enclosure; or there is a reasonable probability that a person in the area, room or enclosure will be exposed to an effective dose rate greater than 25 µSv/h. Table 1: Shows different isotopes with their Exemption Quantities (EQ). Isotopes EQ (μCi) Required Signage bilingual signs are required, >100 EQ H-3 27000 2700000 C-14 2700 270000 S-35 2700 270000 P-32 0.27 27 P-33 27 2700 I-125 27 2700 Ca-45 27 2700 Cl-36 0.27 27 Na-22 0.27 27 Fe-55 1000 100000 K-42 0.27 27 Cr-51 27 2700
If working with radioactive nuclear substance in a quantity greater than 100 its EQ. Please click on the following link and print a Radiation Warning Symbol and post. Link: Sample of Radiation Warning Symbol

 

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Technical questions? Contact safety@uottawa.ca