Hens A Ann
capone
Project 7.1-17/RS-3
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Residual Contamination in Crater
A sample of crater material was obtained from the drone tank and
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gama and beta decay measurements were commenced at H-plus-S-hour.
7
addition to this sample, others were obtained
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on X~Ray~plus~six-—day,
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These consisted of cores and surface material collected at 100 feet
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intervals along a radius from l200 feet in to the dase of the tower,
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The specific alpha and beta plus gamma activity as a function of distance
material,
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and depth in the grown was obtained and will be compared with the crater
This project was even more successful and useful than antici-
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Project 7.1-17/RS(BA). 4
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Aerial Survey of Ground Contamination
Aerial surveys of the crater were made at altitudes from 7000 to
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1000 feet bezinning at H-plus-l-hour and fram 5000 to 500 feet on
% Ray-plus..l-day,
A further aerial survey was conducted on X-Ray~plus-
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6-day when the crater could also be surveyed by sroumd monitors,
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analysis of the data is awaiting completion of the decay curves but it
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appears that excellent results were obtained from these surveys.
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was obtained for the variation of these maximm readings as a function
of altitude,
This method of survey appears very promising for operational
purposes and the instruments used appeared satisfactory for this type
of work,
This project apparently was entirely successful, but flishts
at lower altatudes soon after the detomtion seem desirable.
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maximum readings at each altitude were reproducible, and a smooth curve
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Final
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pated,