Self-Luminous Rare Earth Luminous Stick, Sustainable for 20 Years Lamp Fluorescent Rods, for Collection Display Teaching Gift

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About this item

• High-temperature resistant borosilicate glass housing, size: 0.2‘ diameter × 3.9’ length, 5 mm diameter × 100 mm length
• Continuously emits light for 20 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
• The giant tube is usually relatively dim and does not have brightness intensity as high as the small-diameter tubes (diameter of 0–3 mm)