in leaching the activity decreased the exposure rate by a factor of two. Records from Shot Flathead at 7,730 feet and from Shot Navajo at 13,870 feet indicate that at these locations about two-thirds of the total initial-gamas exposure wes delivered after the arrival of the shock front. fhe crater-lip measurements indicated that the method vas a feasible one; however, no usable data was obtained. The thermal-radiation detector responded satisfactorily to a S-Ni detonation at a distance of 20 miles. ST. LOU 2 ew td

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