Operation Upshot-Knothole Nevada Proving Grounds, March-June 1953. Project 6.10. Evaluation of Rapid Aerial Radiological Survey Techniques. Report to the Test Director,
DEFENSE ATOMIC SUPPORT AGENCY WASHINGTON DC
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Plots of gamma exposure rates due to ground contamination following nuclear detonations were readily obtained by using a standard radiac instrument and employing simple techniques in a rapid aerial survey utilizing light aircraft. This survey consisted of recording exposure rates every five seconds on each leg of a cloverleaf pattern centered over ground zero to obtain the fallout pattern and then taking readings over ground zero at several different altitudes for use in plotting an extrapolation curve. With this curve all data obtained in the air were converted to surface exposure rates. Standard extrapolation curves should be prepared for each type of burst based on data accumulated from aerial surveys. With the data obtained on this operation, a standard extrapolation curve was developed for near surface bursts. This curve provides an approximate means of converting to surface exposure rates after obtaining data at only one altitude and should be used when specific extrapolation data is not available.
- Nuclear Instrumentation