Tritium Tube of 1.5*6mm

Tritium lighting is made using glass tubes with a phosphor layer in them and tritium gas inside the tube. Such a tube is known as a "gaseous tritium light source" (GTLS), or beta light (since the tritium undergoes beta decay).

The tritium in a gaseous tritium light source undergoes beta decay, releasing electrons that cause the phosphor layer to phosphoresce.

Tritium presents no external beta radiation threat when encapsulated in non-hydrogen-permeable containers due to its low penetration depth, which is insufficient to penetrate intact human skin. 

Dimensions
1.5*6mm

Features

• Requires no electrical energy
• Glows for as long as 25 years

Safety

The primary danger from tritium arises if it is inhaled, ingested, injected, or absorbed into the body. This results in the absorption of the emitted radiation in a relatively small region of the body, again due to the low penetration depth. The biological half-life of tritium – the time it takes for half of an ingested dose to be expelled from the body – is low, at only 12 days. Tritium excretion can be accelerated further by increasing water intake to 3–4 liters/day.[11] Direct, short-term exposure to small amounts of tritium is mostly harmless. If a tritium tube breaks, one should leave the area and allow the gas to diffuse into the air. Note that it is lighter than air and will float upwards like helium. Tritium exists naturally in the environment, but in very small quantities.