"The Safeguards Seals Evaluation Program is considering new fiber optic active seal technologies (AST) that can be used at DOE facilities. The goal is to investigate tamper-indicating devices (TID) that can be used to monitor secured containers within vaults while personnel remain outside the vault area. Such a system would allow minimal required access into vaults to verify container TID integrity while ensuring container content accountability. The TID concepts that hold the most promise and keep cost factors down are fiber optic and radio frequency technologies. Four existing manufactured technologies were considered and tested."
Center for Civil Force Protection: http://www.nlectc.org/ccfp