Moderock Self-Luminous Rare Earth Luminous Stick, Sustainable for 25 Years Lamp Fluorescent Rods, for Collection Display Teaching Gift (0.2x3.9in Metal Shell)

Lighting Principle:A borosilicate glass tube is coated with fluorescent material on the inner wall, filled with a small amount of gas, and sealed. The gas steadily releases a low stream of electrons, which excites the phosphor coating, causing it to emit light.

• Continuously emits light for 25 years without the use of any power.
• Gas undergoes pure beta decay and low energy beta rays excite the phosphorescent material on the inner wall to emit light.
• This special gas is a weak light source that can only be seen glowing in the dark and does not require any external energy source.
• The half-life of this particular gas is 12.3 years, i.e. in 12.3 years the luminosity will be half of what it is now, and in 24.6 years it will be a quarter of what it is now.
• The decay product of this particular gas is helium-3, and even if it stops glowing after a few decades, it's still full of the rare helium-3!
• Ideal for collecting, displaying, teaching, gifts