Document Type: Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC A03/MF AO1. Subfile: ERA (Bnergy Research Abstracts). Country of Origin: United States GRA (NTIS NTS) Country of Publication: United States Abstract: The wave form of the electromagnetic pulse resulting from nuclear detonations, especially at very high altitudes is analyzed. In particular, broadband measurements were made from 0 to 10 Mc at ranges up to 460 statue miles. The measurements were a continuation of those made during Operation Plumbbob, although improvements in equipment were incorporated wherever possible. The increased cataloging of EM-pulse wave-form data was very useful in the field of nuclear surveillance. The presence of a second stage in a thermonuclear device can be detected within certain range and system-bandwidth limitations. Correlations of first and second crossover points with total yield, noted in previously recorded wave forms, are supported by these test results. The agreement obtained from the Shot Holly sky wave crossover times indiGates that these measurements are relatively independent of propagation and, therefore, more valuable than field strength for determining yield. Major Descriptors: *ELECTROMAGNETIC PULSES -- WAVE FORMS; *HARDTACK PROJECT ; *NUCLEAR EXPLOSIONS -- ELECTROMAGNETIC PULSES Descriptors: ELECTRIC FIELDS; NUCLEAR WEAPONS Broader Terms: ELECTROMAGNETIC RADIATION; EXPLOSIONS; NUCLEAR EXPLOSIONS; PULSES; RADIATIONS; WEAPONS Subject Categories: Weaponry -- 10/5/528 01877557 450202* (-1989) -- Explosions & Explosives -~ Nuclear -- (Item 228 from file: ERA-12~005099; 103) EDB~87-005190 Author(s): Whitcher, S.L.; Bunney, L.R.; Soule, R.R.; Roza, R.A. Title: Operation Hardtack. Project 2.8. Fallout measurements by aircraft and rocket sampling Corporate Source: Naval Radiological Defense Lab., San Francisco, CA (USA) Publication Date: 1 Sep 1985 p 84 Report Number(s): AD-A-995345/6/XAB Document Type: Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC A0O5/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: The general objective of this project was to estimate, from analytical data on cloud samples, the relative distribution of certain radionuclides between the local and worldwide fallout formed by megaton-range detonations on land and water surfaces, with particular emphasis on the distribution of S$r90 and Cs137 between local and worldwide fallout. Specific objectives were to: (1) obtain airborne particle and gas samples by rocket and aircraft sampling techniques; (2) determine the distribution of radionuclides between two groups of particles that differed from one another in their falling rates in air and that could be considered representative of local and worldwide fallout; (3) attempt to determine an early time distribution of radionuclides and particles between the upper and lower halves of the cloud and radially outward from the cloud axis; and (4) estimate the extent of separation of fallout from gaseous fission products by fission determinations on gas and particle samples collected coincidentally near the top of the cloud at various times following the shots. Major Descriptors: CLOUDS; *HARDTACK PROJECT; *NUCLEAR EXPLOSIONS 9003802 -- *NUCLEAR EXPLOSIONS SURFACE EXPLOSIONS; -- RADIOACTIVE *RADIOACTIVE CLOUDS