UPSC Prelims 2024 Question on – RTG Explained | Space Power Systems & Plutonium-238
Q. With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:
1. RTGs are miniature fission reactors.
2. RTGs are used for powering the onboard systems of spacecrafts.
3. RTGs can use Plutonium-238, which is a by-product of weapons development.
Which of the statements given above are correct?
✅ Correct Answer: (b) 2 and 3 only
Explanation:
Statement 1 – Incorrect: RTGs are not fission reactors. They generate electricity from the heat of radioactive decay (no chain reaction).
Statement 2 – Correct: RTGs are widely used to power spacecraft and deep-space missions where solar energy is insufficient.
Statement 3 – Correct: RTGs commonly use Plutonium-238, which can be derived from nuclear processes associated with weapons programs.
