Country or rubiication: united states Abstract: The purpose of this experiment was to determine the free-air peak-pressure as a function of distance from an atomic explosion. In this report, free-air peak-pressure is defined as the pressure at the head of the blast wave in regions where it has not been reinforced by a reflected wave. Operation in the test area was more difficult than anticipated. Heavy winds made balloon handling very difficult. On the whole, the radio link performed satisfactorily on all occasions and appears to be a reliable method. For some unknown reason, blast switches closer than 1,500 feet failed to give satisfactory signals. Pressures were computed using the Rankine-Hugoniot relation, which is based on the shock wave being a definite discontinuity in pressure. Since the pressures measured on the ground showed relatively long times, there has been some speculation that a true shock wave may not exist in free air. If a true shock wave does not exist in the free-air region, pressures as computed are not experiment cannot be used. Major Descriptors: *GREENHOUSE PROJECT; *SHOCK WAVES -- PRESSURE MEASUREMENT Descriptors: BALLOONS; WIND Broader Terms: AIRSHIPS; EXPLOSIONS; Subject Categories: 450202* Weaponry -- (-1989) 10/5/506 01877600 Author(s): correct, and the method of this *NUCLEAR EXPLOSIONS -- SHOCK WAVES; NUCLEAR EXPLOSIONS -- Explosions & Explosives -- Nuclear -- (Item 206 from file: 103) ERA-12-005127; EDB-87-005233 Hall, W.C. Title: Operation Greenhouse. Scientific Director’s report of atomic weapon tests at Eniwetok, 1951. Annex 1.5. Neutron measurements. Part 3. High-energy spectrum (time-of-flight method) Corporate Source: Naval Research Lab., Washington, DC (USA) Publication Date: 1 Sep 1985 p 84 Report Number(s): AD-A-995399/3/XAB Document Type: Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC AO5/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: This report describes the experiments performed to measure the energy spectrum of neutrons released in certain atomic-weapons tests in Operation Greenhouse. The measurements were made of two types: (1) the time-of-flight measurements designed to establish the fission neutron spectrum down to about 3 MeV energy, and (2) the so-called Tenex (Temperature-Neutron Experiment) measurements designed to obtain the velocity distribution of neutrons produced by the deuterium-tritium fusion reactions. Major Descriptors: *GREENHOUSE PROJECT; *NEUTRON SPECTRA -- TIME-OF-FLIGHT METHOD; *NUCLEAR EXPLOSIONS -~- NEUTRON SPECTRA Descriptors: DEUTERIUM; NEUTRON DETECTORS; NEUTRON FLUX; TRITIUM Broader Terms: BETA DECAY RADIOCISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; EXPLOSIONS; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; MEASURING INSTRUMENTS; NUCLEAR EXPLOSIONS; NUCLEI; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; RADIATION DETECTORS; RADIATION FLUX; RADIOISOTOPES; SPECTRA; STABLE ISOTOPES; YEARS LIVING RADIOISOTOPES Subject Categories: 450202* Weaponry -- (-1989) 10/5/507 01877599 -- Explosions & Explosives -- Nuclear -- (Item 207 from file: BRA+12-005126; Author(s): Shodka, F.R.; 103) EDB-87-005232 Pawlicki, G.S. Title: Operation Sandstone. Scientific Director’s report of atomic-weapon tests at Eniwetok, 1948. Annex 8. Gamma-ray measurements. Parts 1, 2, 3, 4, and 5. Sandstone report No. 29 90031998