1 - ae ee of the know-how that hae gone into the design of instruments for health surveys into the field, into the design of equipment of this type, Here is a probe which will be dropped three thousand feet into a watere filled hole, it will be sugpended on a ¢co- axial teble and the depth at which it is dropped will automatically be recorded in the radiation levels = will automatically be recorded and the whole device weighs about fifty pounds, - 80, instead of drilling a four inch hole, they drill a two inch hole and we now have one inch holes, The front end of it has a orystal and a socintillatometer, This can be lowere ed down thiough three thousand feet of rock, MR. LeVINE: This particular piece of equipment was used by our group, A VOICE: Do you have the instru— ments that were used on boats? MR. BISENBUD: * They are pretty large but we have them here, 131