i dun see the relevance in the equation: ask is different from search.
ok i've SEARCH the net and found that:
Tritium (sometimes also called triton) is radioactive isotope of hydrogen. The emitted electrons from small amounts of tritium cause phosphors to glow so as to make self-powered lighting devices. It had the advantages of being self-powered and producing a consistent luminosity that did not fade during the night.
Luminova is a non-radioactive and non-toxic alternative for illuminating markings on watch dials and hands in the dark. Selected grades of new chemical compositions have up to 100 times better brightness than previous zinc sulphide materials.
think i know now why tritium had been 'phased out'. prob due to its radioactive properties
Orrrrrrrh............... ok ok... thks YOU!! happy new yr huh
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