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Real-Life Math -- Solution

Your readings indicate 30 mg of tritium at the site, which has a half-life of 12.3 years. Given that the facility closed 24.6 years ago, how much tritium was there to start?

24.6 years / 12.3 years per half-life = 2 half-lives gone

Each half-life halves the first amount.

30 mg today + 30 mg 1 half-life ago + 60 mg 2 half-lives ago = 120 mg

"If you're decommissioning a contaminated area, and you're looking for something, you find stuff and you try to get as much information as you can out of it -- how much you're looking at versus how much was there," says Mansfeld. "We have to know how much was there to begin with to figure out how much will be there in the future."


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