The three isotopes 212 Po, 137 Cs, and 90 Sr decay as 212 Po 208 Pb

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The three isotopes

212Po, 137Cs, and 90Sr decay as 212Po → 208Pb + α, 137Cs → 137Ba + e + γ, and 90Sr → 90Y + e.

Which of these isotopes would be most useful as a biological tracer? Why?

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