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U. S. NAVAL RADICIOGICAL GXFEXSE LABCRATCRY
SAN FRANCISCO 24, CALIFORNIA
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U. 8, Naval Radiological Defense Laboratory Report USKRDL-TR-1395
forwarding of
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(1) U. S, Naval Radiological Defense Laboratory Report USKRDL-TR-139
entitled “A Fallout Forecasting Technique with Results Ubtained
at the Eniwetok Proving Ground"
out the arsa. The method dons not yield ths intensity of radiation in the
NS 081-001
by
E.A. Schuert
Physics
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Techaical Objective
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Radiological
Capabilities
T. Triffet,
HeadBranch
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Chemical Technology Division
§. R. Tompkins, Head
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RICHARD S. MANDXLKORN
Scientific Director
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P.C. Tompkins
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Commanding Officer and Director
Captain Richard 5. Mandelkors,USN
U.S. NAVAL RADICLOGICAL DEFENSE LABORATORY
San Francisco 24, California
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U.S. Army
3 April 1957
3. Fallout forecasta made with this technique for four f° .ts at a recent
operation are compared with areas of measured fallout, the comparison is
excelient, and it is evident that the technique works as well for water
surface as for land surface detonations,
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ara. However, relative intensities can be surmised assuaing a radiation
gradient from the hot line to the perimter.
It can,
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highest radiation intensity, and the tine of arrival of fallout through-
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Research and Development Technical Report USNRDL-TR-139
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The end product of this technique is a plot shoming the perineter of
This rmthod is simple, fast, at? suitable for field use,
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the fallout area, the “hot Line", or line through the center of areas of
therefore, be adapted to the naeds of aiitary forces in the field,
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A FALLOUT FORECASTING TECHNIQUE WITH RESULTS
OBTAINED AT THE ENIWETOK PROVING GROUND
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le. A method for forecestirg fallout areas was developed to supply the
operational needs of scientific projects at the Eniwetok Proving Grounds.
Tho nethod employs a simplified cloud medel and distribution of particles
in the cloud based on paramsters obtained from previous weapons tests
‘_ and from theory. The particles are tracked to the earth's surface by
considering trair, falling speeds and effects of the winds existing aloft.
Tracking is simplified by use of the plotting device described in a
previous report.
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JUN 2 1 1957
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