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What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?
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What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?

User Randhir
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Answer:

The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.

User Fargonaut
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