Everybody was really excited about Curiosity, and that had this big plutonium battery on board that has plutonium-238, which actually has a higher specific activity than the low-enriched uranium fuel of these molten salt reactors, which means that the effects would be negligible, because you launch it cold, and when it gets into space is where you actually activate this reactor.
Svi su bili vrlo uzbuđeni oko Curiosity, a ono je imali veliku bateriju plutonija  na sebi koja sadrži plutonij 238, koji zapravo ima veću specifičnu aktivnost nego nisko obogaćen uranij ovih reaktora otopljene soli, što znači da bi efekti bili neznatni, jer ih lansirate hladnima, i kada dođu u svemir,  tamo aktivirate reaktor.