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WBCS Preliminary Examination 2022 — General Studies · Question 145 of 200

Q145
General SciencePhysics
The radioactive element used in heart pacemaker is
  1. a.Uranium
  2. b.Deuterium
  3. c.Plutonium
  4. d.Radium

Answer: (C) Plutonium

Plutonium-238 was historically used in nuclear-powered cardiac pacemakers in the 1970s–80s. These devices used the heat from radioactive decay to generate electricity, lasting for decades without battery replacement. Modern pacemakers use lithium-iodide batteries, but Plutonium remains the textbook answer for this question.

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