Very interesting. Wiki also says it's not needed for most uses now since that background radiation has greatly reduced since we stopped blowing up bombs in the

Very interesting. Wiki also says it's not needed for most uses now since that background radiation has greatly reduced since we stopped blowing up bombs in the atmosphere. "... background radiation has decreased to very near natural levels ... low-background steel no longer necessary for most radiation-sensitive applications,... However, some demand remains for the most radiation-sensitive applications, such as Geiger counters and sensing equipment aboard spacecraft. For the most demanding applications even low-background steel can be too radioactive and other materials like high purity copper may be used."