Radiological Assessment of Target Debris in the National Ignition Facility

Activation of the Be-Cu or Ge-doped CH capsules is insignificant. DU generates higher dose rates than Au during the first day following a 20 MJ shot. Au produces higher dose rates after longer wait-periods. Contribution from activated target materials to the overall dose environment inside the Target Chamber is small. Fission gases generated from the use of DU will significantly decay away within one day after a 20 MJ shot. A typical wait period of 5 days is planned for all maintenance activities after 20 MJ shots, resulting in a significant reduction in hazards present inside the Target Bay due to the use of proposed target materials