Country of Publication: United States Abstract: An experiment was designed to measure the fall-out pattern and to study the nature of the fall-out particles from low-level, experimental atomic bomb air bursts in order to provide data for the appraisal of the potential health hazard from external and internal exposure to the fall-out products. Samples of the fall-out from Dog and Easy Shots were obtained. A study of the size distribution of the active particles was made by size fractionation and radioautographic techniques. Radiochemical analyses of the fallout were made. In addition, a study of the structure and composition of the fall-out particles was ‘made. was determined that the bulk of the radioactivity in the fall-out was It associated with particles greater than 5 microns in diameter. The highest radiation levels were found on Bogallua at E + 30 min. The reading was about 30 r/hr as measured from a helicopter hovering 10 to 20 £t above the island.; Major Descriptors: *GREENHOUSE PROJECT -- FALLOUT Descriptors: CHEMICAL ANALYSIS; DOSE RATES; PARTICLE SIZE; PERSONNEL; RADIATION HAZARDS; RADIOCHEMISTRY; SPATIAL DISTRIBUTION; WIND Broader Terms: CHEMISTRY; DISTRIBUTION; EXPLOSIONS; HAZARDS; HEALTH HAZARDS s NUCLEAR EXPLOSIONS; SIZE Subject Categories: 450202* -- Explosions & Explosives -- Nuclear <-Weaponry ~~ (-1989) 510302 -~ Environment, Terrestrial -- Radioactive Materials Monitoring & Transport 10/5/661 01499524 -- Terrestrial Ecosystems (Item 361 from file: EDB-85-006282 & Food Chains -- (-1987) 103) Author(s): Heidt, W.B. Ur.; Schuert, E.A.; Perkins, W.W.; Stetson, R.L. Title: Nature, intensity, and distribution of fall-out from Mike shot Corporate Source: (USA) Naval Radiological Defense Lab., San Francisco, CA Publication Date: Apr 1953 p 84 Report Number(s): AD-467227/5 Note: Report on Operation Ivy, Project 5.4a Document Type: Report Language: English Journal Announcement: BRA8412 Availability: NTIS, PC AO5/MF AOl. Subfile: BRA (Energy Research Abstracts). Country of Origin: United States Country of Publication: United States Abstract: The physical and chemical properties of the particulate matter deposited following Mike shot, Operation Ivy, together with its distribution in time and area, were investigated. Total fallout and differential fall-out collectors were installed in islands, anchored lagoon floats, and free-floating sea stations about the detonation point. All collected samples were analyzed at the U. S. Naval Radiological Defense Laboratory. All the samples of primary Pall-out collected were in a cross-wind direction from the detonation point; secondary fall-out samples were collected to distances of 600 miles from this point. Radiation levels as high as 800 r/hr at 2 hr were found 3 miles from the detonation point. No positive evidence of the occurrence of a base surge was found.; Major Descriptors: *FALLOUT DEPOSITS -- CHEMICAL PROPERTIES; *FALLOUT DEPOSITS -- PHYSICAL PROPERTIES; *FALLOUT DEPOSITS -- SPATIAL DISTRIBUTION; *IVY PROJECT -- FALLOUT Descriptors: CALCIUM COMPOUNDS; PARTICLE SIZE; PARTICULATES; RADIATION HAZARDS; STRATOSPHERE Broader Terms: ALKALINE EARTH METAL COMPOUNDS; DISTRIBUTION; EARTH ATMOSPHERE; EXPLOSIONS; FALLOUT; HAZARDS; HEALTH HAZARDS; NUCLEAR EXPLOSIONS; PARTICLES; SIZE Subject Categories: 450202* -- Explosions & Explosives -- Nuclear -Weaponry -~ (-1989) 510302 -- Environment, Terrestrial -- Radioactive Materials Monitoring & Transport 520301 -- Terrestrial Ecosystems & Food Chains -- Environment, -- (-1987) Aquatic -- Radioactive Materials Monitoring & cy” ro cS rey aoe cm iso