bilby
Fair dinkum thinkum
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No solution my arse. Here are a bunch of solutions:
Reprocess
Use in RTGs
Bury in abandoned deep mines
Dump in deep abyssal silt
That's four off the top of my head. Given that this is far from an exhaustive list, and given that four is greater than zero, can I take it that you won't be repeating the "No solution" canard again?
I didn't think so.
You'll have to reprocess before you build those RTGs. You want to build them out of alpha and beta emitters only.
You also missed another useful product: Death rays. A big pile of cobalt-60 is quite lethal. This can be quite useful if you want to kill things without destroying them--how about shelf-stable meat? (Kill the bacteria in it.) We do it frequently with thin enough things with electron beams or x-rays but sterilizing thick things requires gamma and generating gamma rays takes a pretty big piece of gear.
Sure; as I said, there's heaps of other options. Medical uses are important too, although generally it's easier to make the isotopes you want in specialised reactors optimised for those particular products.
Basically, if it's active enough to be a threat, it's active enough to be useful.
I am not sure that you need to do much in the way of reprocessing before building an RTG; You just need to wait a few half-lifes of the major gamma emitters, all of which are fairly short lived (a couple of weeks). The only gamma left by the time the rods come out of the initial cooling pond is from 137Cs decays to 137mBa; the Caesium has a half-life around 30 years, and the Barium decays in a couple of minutes, so the activity is determined entirely by the quantity and decay rate of the 137Cs. If it is too high to tolerate, then it should be much simpler to remove the Cs chemically than it is to do a full reprocessing job that pulls out all the actinides for re-use. The Cs can go to medical uses, and the rest of the stuff can just go straight into an RTG - NASA likes to use units with just one isotope, so that they can control the activity and (more importantly) the mass of the unit very closely, but for terrestrial use, close enough is good enough - wrap a nice layer of lead (or better still a lead/steel laminate, with the steel on the outside) around the thing and stick it under the floor of a hut for year round free heating at high latitudes.