Accession Number : AD0357966

Title :   MEASUREMENT OF IRRADIANCE AT HIGH TIME RESOLUTION

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA

Personal Author(s) : Plum, W. B. ; Jenkins, R. J.

Report Date : 30 APR 1958

Pagination or Media Count : 30

Abstract : Irradiance versus time wab recorded for two multimegaton detonations. Data on the Cherokee shot was not obtained due to the large drop error. Satisfactory performance was obtained from the instrumentation on the Zuni shot; times to first maximum, minimum, and second maximum were obtained as well as the total thermal energy distribution through time. The values recorded for Zuni appear to confirm the practicability of scaling from small to large yields in the various scaling laws. The relative amplitudes of the first and second pulses is reversed for the Zuni shot as compared to smaller devices, with the second maximum considerably higher than the first. Evidence is presented to show that considerable care must be exercised in the interpretation of the data. The Pacific atmosphere makes it essentially impossible to extrapolate from irradiance measurements at a distant point back to the device itself. Evidence is presented to show that considerable care must be exercised in the interpretation of the data. (Author)

Descriptors :   *NUCLEAR EXPLOSIONS, THERMAL RADIATION.

Subject Categories : Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE