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NetworkLlama t1_iyvmmco wrote

Reply to comment by MortalPhantom in Why not use hydrogen and deuterium in fusion reaction rather than tritium and deuterium? by Curious_user4445

A tiny fraction of a gram is used, with a maximum of 25 millicuries allowed per timepiece. A little bit goes a long way for that purpose.

Edit: I looked up some numbers, and the amount of tritium in any given timepiece is apparently measured in micrograms, not even milligrams. I'm having trouble finding exact amounts, but a very rough calculation based on a specific activity of 9650 Cu/g and 25 millicuries results in .025 mCu-g/9650 Cu = 2.6 micrograms per watch. That's a very, very tiny amount.

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vokzhen t1_iyx4njh wrote

For those who don't grasp what this means very well, those numbers mean a gram of tritium is enough for about 400,000 watches.

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