News at 10
I spent 2 years working with radioactive materials (H3, P32, etc) as a student in a lab (those were the days before the H&S paranoia). So my brain is in violation of the relevant part of the UK criminal code "materials useful for terrorism" (sorry, cannot remove it and hand it for police inspection).
Based on what it contains... Enriched Uranium... Dirty bomb... Meah... Wake me up when someone tries to steal any quantity of radioactive Cobalt or Cesium. Now that will be "code brown" (pants) - the sh*t is nearly impossible to clean up.
Uranium's value as dirty bomb material is purely journalistic