Cardiac Pacemakers Once Used Plutonium-238 as a Power Source

question 74

Multiple Choice

Cardiac pacemakers once used plutonium-238 as a power source. Plutonium-238 decays by the emission of gamma rays and alpha particles. This emission is not particularly harmful because ________

• A)gamma rays are not absorbed very strongly by biological tissue, and alpha particles do not penetrate beyond the container.
• B)gamma rays and alpha particles are the least dangerous form of radiation.
• C)gamma rays and alpha particles do not penetrate beyond the container.
• D)gamma rays are absorbed by the container, and alpha particles do not affect biological tissue.
• E)tissue damage caused by gamma rays and alpha particles is rapidly repaired by enzymes.

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