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SCIENTIFIC DIRECTOR'S REPORT OF ATOMIC WEAPONS TESTS AT ENIWETOK, 1951.ANNEX 6.4. FALL-OUT PHENOMENOLOGY,
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA
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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. It was determined that the bulk of the radioactivity in the fall-out was 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 rhr as measured from a helicopter hovering 10 to 20 ft above the island. Author
APPROVED FOR PUBLIC RELEASE