Development of Filmless Technique for Recording Defects in Ship Welds

摘要

From the foregoing it is concluded that, at least at present, the scintillator is the most useful detector of gamma radiation. Its usefulness will be investigated in connection with a larger gamma ray source (at present about 2000 m C is available). New standard welded plates in preparation at the Philadelphia Naval Shipyard will be checked with one and two scintillators. The latter will be connected electrically in a bridge circuit, and one scintillator will be affected by the radiation transmitted through the weld, and the other through the adjacent base metal. The application of the ratemeter instead of the scaler will be investigated.