![]() If not, the sign may be damaged or have reached the end of its working life. The sign should also have a permanent warning label that mentions tritium, 3H or H-3 displays the three-bladed radiation warning symbol and states "Caution-Radioactive Materials." If all four letters in EXIT are fully lit, the sign is working properly. When the lights are off, tritium will make the word EXIT glow green or red. There are a couple ways to know whether an EXIT sign contains tritium. Tritium gas is odorless, colorless and tasteless, and is lighter than air. If inhaled, it leaves the body relatively quickly. This type of radiation cannot penetrate a sheet of paper or clothing. The tritium gives off low-energy beta radiation that causes the lining to glow. In EXIT signs, tritium gas is contained in sealed glass tubes lined with a light-emitting compound. Tritium, also known as 3H or H-3, is a form of hydrogen. The signs pose little or no threat to public health and safety or security. ![]() ![]() They serve an important safety function by marking exits to be used during power outages and emergencies. These signs do not require electricity or batteries and can be used where it is hard to install electric signs, such as above doors. EXIT signs that glow in the dark often contain a radioactive gas called tritium.
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