Not Chernobyl but from atmospheric nuke testing during WWII and the Cold War. You can purchase pre-atomic lead and steel forged before WWII which isn't contaminated. The only time it would make a difference is if you're trying to build shielding for a highly sensitive radiation detector.
Only places I've ever heard of it being needed are the national labs.
Only places I've ever heard of it being needed are the national labs.