Operation SUN BEAM, SHOT SMALL BOY. Project Officers Report. Project 1.4. Shock Photography,
NAVAL ORDNANCE LAB WHITE OAK MD
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The objective of this project was to measure the shock position as a function of time from which shock velocities and pressures in limited regions could be calculated, and any asymmetric growth both along along and above the surface could be detected. An outgrowth of the fireball along the surface was observed, and it was attributed to surface heating. The rate of growth along the surface was asymmetric. The growth along the 113 deg azimuth was markedly greater than in any of the other directions measured. Contrary to previous experience with surface shots, the peak pressures obtained above ground zero were less than those obtained along the surface at the same distances. there is some evidence to suggest that the focusing noted on previous shots did not occur or was very much reduced. Scaled Small Boy peak pressure distance data are in agreement with the composite surface burst pressure distance curve.
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