An oncology clinic uses the metastable isotope Technetium-99m, a common radiopharmaceutical with a half-life of 6.0 hours6.0\text{ hours}6.0 hours, for diagnostic imaging scans.
What is the decay constant, λ\lambdaλ, of Technetium-99m in units of s−1\text{s}^{-1}s−1?
1.2×10−4 s−11.2 \times 10^{-4}\text{ s}^{-1}1.2×10−4 s−1
4.6×10−5 s−14.6 \times 10^{-5}\text{ s}^{-1}4.6×10−5 s−1
3.2×10−5 s−13.2 \times 10^{-5}\text{ s}^{-1}3.2×10−5 s−1
9.6×10−6 s−19.6 \times 10^{-6}\text{ s}^{-1}9.6×10−6 s−1
128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.