CLOUQ ULM LUIS. YVRSSeLVALLULIS 2NatealLeu Lika Liu ihe JOL Ppurtivull OL Cll Mike cloud entered the stratosphere - the cloud top reached 120,000 feet with the mushroom base at about 67,000 feet. The tropopause height at the time of the detonation was about 58,000 feet. The top of the King cloud reached about 74,000 feet with the mushroom base at about 40,000 feet. Samples for the measurement of the world-wide distribution of induced gaseous activity (tritium and carbon-14) were taken at widely separated geographical positions, including both northern and southern hemisphere points. These samples were periodically collected at each location over a period of six months following the detonations. Major Descriptors: *IVY PROJECT; *NUCLEAR EXPLOSIONS -- FALLOUT; *NUCLEAR EXPLOSIONS -- RADIOACTIVE CLOUDS; *RADIOACTIVE CLOUDS -- ATMOSPHERIC CIRCULATION Descriptors: AIR; ATMOSPHERIC EXPLOSIONS; CARBON; CARBON 14; CARBON DIOXIDE ; DIFFUSION; RAIN; SAMPLING; STRATOSPHERE; TRITIUM; TROPOPAUSE; WATER VAPOR Broader Terms: ATMOSPHERIC PRECIPITATIONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON COMPOUNDS; CARBON ISOTOPES; CARBON OXIDES; CHALCOGENIDES; CLOUDS; EARTH ATMOSPHERE; ELEMENTS; EVEN-EVEN MUCLEI; EXPLOSIONS; FLUIDS; GASES; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; NONMETALS; NUCLEAR EXPLOSIONS; NUCLEI; ODD~EVEN NUCLEI; OXIDES; OXYGEN COMPOUNDS; RADIOISOTOPES; TROPOSPHERE; VAPORS; YEARS LIVING RADIOISOTOPES Subject Categories: 450202* Weaponry -- (-1989) 10/5/482 01877626 Author(s): H.O. -- Explosions & Explosives -- Nuclear -- (Item 182 from file: 103) ERA-12-007265; EDB-87-005259 Gibson, H.F.; Miller; Motz, J.W.; Smeltzer, J.C.; Wyckoff, Tatle: Operation Greenhouse. Scientific Director’s report of atomic-weapon tests at Eniwetok, 1951. Annex 1.2. Delayed gamma-ray measurements. Part 1. Gamma-ray spectrum measurements (abridged) Corporate Source: National Bureau of Standards, Washington, DC (USA). Radiation Physics Div. Publication Date: 1 Sep 1985 p 59 Report Number(s): AD~A-995447/0/XAB Note: Extracted version of report dated Apr 52. See also Annex 1.2, Part 4, AD-A995 420; Availability: Microfiche copies only Document Type: Report Language: English Journal Announcement: EDB8612 Availability: NTIS, PC A04/MF AOQl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: Measurements of bomb efficiencies from the number of gamma rays requires fundamentally two separate experiments. The average number of gamma rays emitted from the fission fragments (delayed gamma rays) per fission must be determined. This experiment can be carried out in the laboratory. A second experiment, the absolute determination of the number of gamma rays from the bomb was also attempted. Because gamma rays are not directly observable but are measurable only through their secondary effects, and because the probability of occurrence of the secondary effects depends upon the gamma ray energy, it is not usually possible to count directly the number of gamma rays in a , heterochromatic spectrum. A spectral distribution must be first obtained from which the actual total number of gamma rays may be computed. This volume discusses, in detail, the planning for the experiment and the spectral distribution of collimated gamma-rays determined, from the Greenhouse tests on two shots. A discussion of measurement of build-up factor which is needed to estimate the effect of collimation is also given. Major Descriptors: *GREENHOUSE PROJECT; *NUCLEAR EXPLOSIONS GAMMA RADIATION; *NUCLEAR EXPLOSIONS -- GAMMA SPECTRA So0c3111 -- DELAYED