Rhodium, Ruthenium
Rhodium and ruthenium are precious metals produced by nuclear fission, as a small percentage of the fission products. The radio-isotopes of these elements with the longest half-life, which are generated by nuclear fission have half-life times of 45 days and 373.59 days for rhodium and ruthenium, respectively. This makes their extraction from spent nuclear fuel possible, although they must be checked for radioactivity before use.
Until now no facility has been reprocessing spent nuclear fuels for rhodium and ruthenium; however, Japan is planning to do so in their new spent fuel reprocessing facility, which will help offset the cost of reprocessing.
Read more about this topic: Synthesis Of Precious Metals