"Oh..." Jack went "crap." He paused for a moment, considering his options. His best would most likely be to remove the irradiated piece of metal, and then give him a stimpack to help heal the wound. But there was still the radiation poisoning. Considering the fact that they were in the middle of a desert, he should probably head to the source of the radio transmission, and hope that they have some rad away.
"Alright..." Jack went "I'm gonna remove this bit of metal. It's probably going to hurt. Then I'll give you this stimpack, and I'll carry you to the radio transmission. Sound good?"