User blog comment:General Vincent Fardesto/HLF Armor/@comment-23603505-20150328064158/@comment-25405125-20150416041411

The M1 Abrams is composite, it's mixup materials.

It's reinforced with depletalloy (not-fully-become lead) for NBC purpose, and they use only a thin layer for that job.

Depleted uranium has a many states. The only state that's non-radiated is lead.