Artificial and natural is probably not the best terminology to use [0]. What is true is that this will almost certainly contain enrichment of one or more isotop

Artificial and natural is probably not the best terminology to use [0]. What is true is that this will almost certainly contain enrichment of one or more isotopes (NASA uses Pu-238 for some of their missions). [0] https://en.wikipedia.org/wiki/Natural_nuclear_fission_reactor https://en.wikipedia.org/wiki/Natural_nuclear_fission_reacto... - your terminology immediately made me think of this