Cameron is a doctor treating a cancer patient, Billy is an archeologist dating a vase, and Isabelle is a geologist dating a layer of soil. Which isotopes would each person most likely use?
Answer
A
Cameron would use carbon-14, Billy would use cobalt-60 (which releases gamma rays), and Isabelle would use uranium-238.
B
Cameron would use cobalt-60 (which releases gamma rays), Billy would use carbon-14, and Isabelle would use uranium-238.
C
Cameron would use uranium-238, Billy would use carbon-14, and Isabelle would use cobalt-60 (which releases gamma rays).
D
Cameron would use cobalt-60 (which releases gamma rays), Billy would use uranium-238, and Isabelle would use carbon-14.
Explanation
Cobalt-60 emits gamma rays that can be used in radiation treatment, so it fits Cameron’s work as a doctor treating cancer. Carbon-14 is commonly used to date relatively recent archaeological materials, matching Billy’s task. Uranium-238 has a very long half-life and is used to date ancient rocks and geological layers, so it fits Isabelle’s work.
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