10/5/555 01861623 Author(s): (Item 255 from file: 103) ERA-12-001431; EDB-86-185517 Gibson, Wyckoff, H.O. H.F.; Miller, W.; Motz, J.W.; Smeltzer, J.C.; Title: 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 Pp 91 Report Number(s): AD-A-995298/7/XAB Note: Extracted version of report dated Apr 52 Document Type: Report Language: English Journal Announcement: EDB8610 Availability: NTIS, PC AO5/MF AOQl. Subfile: BRA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: The measurement 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 are also attempted. Because gamma rays are not directiy observable but are measured 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 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 SPECTRA Descriptors: FISSION PRODUCTS; GAMMA SPECTROMETERS Broader Terms: EXPLOSIONS; ISOTOPES; MATERIALS; MEASURING INSTRUMENTS; NUCLEAR EXPLOSIONS; RADIOACTIVE MATERIALS; SPECTRA; SPECTROMETERS Subject Categories: Weaponry 10/5/556 01861622 ~- 450202* (-1989) -- Explosions & Explosives -- Nuclear -- (Item 256 from file: Author(s): 103) EFRA-12-001430; EDB-86-185516 Waters, A.J.; Clapp, R.E. Title: Operation Redwing-Project 6.4. Airborne antennas and phototubes for determination of nuclear-weapon yield. Report for May-July 1956 Corporate Source: Advance Industries, Inc., Cambridge, MA (USA) Publication Date: 1 Apr 1985 p 145 Report Number(s): AD-A-995297/9/XAB Document Type: Report Language: English Journal Announcement: EDB8610 Availability: NTIS, PC AO7/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: Airborne equipment was designed for determining the location and yield of ai nuclear detonation. This equipment determines yield from a measurement of the interval between the time of the burst and the time of the second peak in the thermal-radiation intensity curve. lush~mounted ferrite-core magnetic loop antennas for use in detecting 03618