A 6.2 mg sample of 90Sr (half-life 29.12 y) is in secular equilibrium with its daughter 90Y (half-life 64.0 h). (a) How many Bq of 90Sr are present? (b) How many Bq of 90Y are present? (c) What is the mass of 90Y present? (d) What will the activity of 90Y be after 100 y?

Chemistry & Chemical Reactivity
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Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Chapter25: Nuclear Chemistry
Section25.4: Rates Of Nuclear Decay
Problem 25.5CYU
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A 6.2 mg sample of 90Sr (half-life 29.12 y) is in secular equilibrium with its
daughter 90Y (half-life 64.0 h). (a) How many Bq of 90Sr are present? (b) How many Bq
of 90Y are present? (c) What is the mass of 90Y present? (d) What will the activity of 90Y
be after 100 y?

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