Broader Terms: CLEANING; EXPLOSIONS; ISLANDS; NUCLEAR EXPLOSIONS; OCEANIA; WEAPONS 450202* Subject Categories: Weaponry ~~ (-1989) MARSHALL ISLANDS; <= Explosions & Explosives -~ Nuclear -~ -- Radiochemistry & Nuclear Chemistry -- Properties of 400702 ‘ Radioactive Materials 10/5/603 01678152 MICRONESIA; (Item 303 from file: 103) ERA-11-006177; EDB-86-005072 Author(s): Tochilin, E.; Howland, P. ‘ Title: Operation GREENHOUSE. Scientific Director’s report of atomic weapon tests at Eniwetok, 1951. Annex 6.5. Interpretation of survey-meter data Corporate Source: Naval Radiological Defense Lab., San Francisco, CA (USA) Publication Date: Aug 1951 p 119 Report Number(s): AD-A-995257/3/XAB Document Type: Report Language: English Journal Announcement: EDB&510 Availability: NTIS, PC AO6/MF AOl. Subfile: ERA (Bnergy Research Abstracts). Country of Origin: United States Country of Publication: United States Abstract:' This is the Scientific Director's Report of Atomic Weapon Test at Enuivetok, 1951. Under laboratory conditions, a study of survey~instrument response to fission-product activity was made. This study involved a knowledge of beta-ray energy, gamma-ray energy, and beta-ray and gamma-ray dose rates associated with fission-product radiation fields. Fission-product activity was collected on aluminum plaques which were flown through the radioactive cloud following each of four bursts. These plaques were flown to the Laboratory for the work done. Beta-ray dose rates were determined with specially constructed beta-ray surface chambers previously calibrated with beta-ray isotopes. Using aluminum absorbers, beta-ray absorption curves were run and compared with similar absorption measurements obtained using known beta-ray isotopes. Gamma-ray dose rates were obtained by shielding out the beta-ray contribution. The response of various types of commercially available G-M counters and ion-chamber counters to fission-product beta-ray and gamma-ray was studied. Changes in beta-ray energy were studied for the period from 44.6 to 215.7 hr. It was found that the beta-ray absorption curve could be reproduced by a high-energy and low-energy component of beta radiation. Laboratory determination of effective gamma-ray energies using half-value-layer measurements by means of aluminum, copper, and lead filters showed the energy to be dependent upon the absorber used. Major Descriptors: *BETA PARTICLES -- SURVEY MONITORS; *ENIWETOK -= GREENHOUSE PROJECT; *GAMMA RADIATION -- SURVEY MONITORS; *GREENHOUSE PROJECT -- SURVEY MONITORS; *NUCLEAR WEAPONS -- TESTING; *SURVEY MONTTORS -- PERFORMANCE Descriptors: FILTERS Broader Terms: CHARGED PARTICLES; ELECTROMAGNETIC RADIATION; EXPLOSIONS; .fONIZING RADIATIONS; ISLANDS; MARSHALL ISLANDS; MEASURING INSTRUMENTS; MICRONESIA; MONITORS; NUCLEAR EXPLOSIONS; OCEANIA; RADIATION MONITORS; RADIATIONS; WEAPONS Subject Categories: 450202* Weaponry ~~ (-1989) -- Explosions & Explosives -- Nuclear -- 10/5/604 (Item 304 from file: 103) 01678151 ERA-11-006176; EDB~-86-005071 Title; Operation HARDTACK I B.1.4. Commander Task Group 7.3. Administrative Plan Number 1-58. Revised Corporate Source: Joint Task Force Seven, Washington, DC (USA) Publication Date: 5 May 1958 p 96 Report Number(s): Document Language: Type: AD-A-995256/5/XAB Report English od wor co rng iro