Operation GREENHOUSE. Scientific Director's Report of Atomic Weapon Tests at Eniwetok, 1951. Annex 1.5. Neutron Measurements. Part 1. Diagnostic Neutron Experiments, Section 2.
NAVAL RESEARCH LAB WASHINGTON DC
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The effects of radiation on the passage of an electromagnetic wave along a cable are too complicated to predict accurately from theory alone. Also, near the bomb, the intensity during the shot is so high that the results of laboratory measurements must be extrapolated by too many orders of magnitude to be applied with much confidence to the test conditions. Therefore a number of cables were installed near the bomb for the sole purpose of study the radiation effects, both to help correct the data obtained in the present tests and to help predict shielding requirements in future tests. The two types of effects looked for were 1 a simple attenuation of a voltage across the line due to the shunt conductance set up when Compton recoil electrons from the gamma rays ionize the gas between the inner and outer conductors and 2 an induced signal due to the Compton electrons being knocked out of the inner and outer conductors in unequal amounts. On the basis of the results, a discussion is given of the adequacy of the coral shielding actually used to protect the horizontal cable runs.