It's possible to use them as cheap working force. At the uranium mines, for example.
We also need some appointed volunteers to deal with fukushima and chernobyl consequences... Just let them to choose between shooting or removing the debris from the reactor room. If they'll decide to help then provide them some suitable treatment of radiation poisoning. And amnesty, in case of survival.
Originally I was thinking on simple things like soil improvement or turning them to dog food, but your solution looks more efficient indeed

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