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The half-life of Mo-99 is 67 hours A 200 ug quantity decays over time to 25 ug How much time has elapsed?
Wiki User
∙ 11y ago
200 ug > 100 ug > 50 ug > 25 ug. That's 3 half lifes.
3 half lives x 67 hours/ half life = 201 hours
Wiki User
∙ 11y ago
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