The half life of Cesium-137 is 30.17 years. Find the exponential decay constant, k.

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If k is the annual decay rate, e⁻ᵏᵗ=½, where t is the half-life=30.17 years.

-kt=ln(½).

So -30.17k=-ln(2), and k=ln(2)/30.17=0.023 approx.

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