130 AFTERNOON SESSION t MR. EISENBUD: Two of the presentations will be best here and we will pause for about a half hour which will also give us: the oprortunity to intro- duce to you, the work of the inetrument branch, Bagically, we are a low level inetrument laboratory but in addition to that there are involved many techniques which make 1€ possible to-do measurementa that are ordinarily measurements in the field. To illustrate that I want to get outside of the field of health and safety because occasionally we are called upon to @o other things. It used to be that when a geologist wented to find out how much uranium is in the soil product, he drills a four inch hole down to a few thousand feet, All those coils would come ont.on a truck and the truck would go to the laboratory. With tan: dncrease in the geological activity six or seven years ago, this tech- nique was no longer feasible and we put some ~~, Lat aah