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 developmentWhich of the statements given above are correct?

1. A

   1 and 2 only

   1 and 2 only. RTGs are not miniature fission reactors.

2. B

   2 and 3 only

   2 and 3 only. Used on spacecraft; Pu-238 from the nuclear complex, including weapons-related production historically.

3. C

   1 and 3 only

   1 and 3 only. Drops the true spacecraft use; keeps the false fission claim.

4. D

   1, 2 and 3

   All three. Statement 1 fails: RTGs are radioisotope decay heat + thermocouples, not a fission pile.

Summary. Official key is (b) 2 and 3 only. An RTG converts heat from radioactive decay (often plutonium-238) into electricity with thermocouples. It is not a miniature fission reactor. RTGs power spacecraft (Voyager, Curiosity, etc.). Pu-238 has been produced in reactors tied to the weapons complex. So 1 is false; 2 and 3 hold.