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?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Correct answer: (b) 2 and 3 only
Question from UPSC Prelims 2024 GS Paper
Explanation:
- RTGs are miniature fission reactors This statement is incorrect. RTGs are not fission reactors. They generate electricity through the thermoelectric effect, using the heat produced by the natural radioactive decay of radioisotopes. They do not involve nuclear fission.
- RTGs are used for powering the onboard systems of spacecrafts. This statement is correct. RTGs have been used in many space missions to power spacecraft systems, especially for deep space missions where solar power is not practical.
- RTGs can use Plutonium-238, which is a by-product of weapons development. This statement is correct. Plutonium-238 is indeed used in RTGs. While it can be a by-product of weapons development, it’s important to note that it’s specifically produced for space and medical applications and is not suitable for weapons use itself.