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IMPROVEMENTS IN AND RELATING TO TEXTILE TREATMENT MEANS FOR COLLIMATING A BEAM OF GAMMA RAYS EMITTED BY ONE EDGE OF AN IRRADIATED FUEL ELEMENT EXAMINED BY A DETECTOR
IMPROVEMENTS IN AND RELATING TO TEXTILE TREATMENT MEANS FOR COLLIMATING A BEAM OF GAMMA RAYS EMITTED BY ONE EDGE OF AN IRRADIATED FUEL ELEMENT EXAMINED BY A DETECTOR