If you leave a body in your back yard (Conceptually, don’t do this is real life of there will be a lot of problems) it will decompose. Not because of radiation, but the cells have to do work to keep it together and when they stop doing that work, the cells come apart and makes a mess. The bones are made of more durable materials, and don’t decompose as quickly. Many living organisms contribute to this process, from insects to bacteria.
No doubt high radiation levels will mess with all these processes, but some bacteria and insects are quite radiation hard, so something different but similar will happen.
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