Securing Loose Nukes in Chile
Enrique Siques for TIME
The Fuel Rod
The greatest dangers to the world's supply of HEU, says Bieniawski, are "insiders." All confirmed cases of illicit trafficking of enriched uranium in the past 20 years have involved employees who siphon material and attempt to sell it on the black market. No amount of physical security, he says, can combat this threat.
Get the Latest Photos from Time.com
Get TIME photos and pictures of the week delivered directly to your inbox.