MPK, a company that has made a name producing glow-in-the-dark paint, has developed self-luminous micro particles called Litrospheres. The new material is said to be inexpensive (35 cents to light up a 8 ½ x 11 piece of plastic that is 1/8" thick), non-toxic, and capable of staying constantly lit for over 12 years thanks to a betavoltaic technology that uses a radioactive gas.
Fortunately, the gas is involves a "soft" emission of electrons that cannot penetrate the glass or polymer wall of the microspheres. So theoretically, you don't have to worry about brain tumors or taking on super powers when using it.
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