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Svnanca AND RADIOLOGICAL LABORATORIES REPORTS.
{CRLR)
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FILTER MATERIAL EFFICIENCY AGAINST HIGH LEVELS OF
AIRBORNE RADIOACTIVE CONTAMINATION.
Elmer H. Engquist, Jerry J. Mahoney, and
Robert B. Price, 13 August 1954.
,
SECRET
The penetration of Chemical Corps type 6 filter material py I131-
ing
labeled aerosols having a mean particle size of 0.48 has previously been
0
ed
This work was undertaken to determine the penetration of
bigh as 20u¢/1.
this type filter material by similar aerosols at considerably higher
.
stown (TCR 60) to be between 0.02% and 0.04% when activity levels were as
activity levels.
nst
Using sodium iodide aerosols labeled with qi31, and maintaining
the mean particle size at 0.48,, as in the earlier work, it was found
that there is a significant increase in the efficiency of type 6 filter
reaterial at higher activity concentrations.
Specifically, penetration
between 60 pe/1 and 400 po/1 activity was found to range from about
0.005% to 0.007%.
It appears, therefore, that Chemical Corps type 6
filter material may be used effectively against airborne particulate
material having radioactivity of the order of magnitude of that anticipated
in the vicinity of an atomic bomb explosion.
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PRELIMINARY REPORT ON THE FEASIBILITY OF BODY ARMOR FOR USE
BY SPECIAL TROOPS AGAINST IONIZING RADIATION.
Alfred W. Klement, Jr., January 1953.
SECRET
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This report is based on an extensive Literature search through
<a relating to point-source radiation, whereas conclusions based on
radiation from uniform field areas would have been of greater value.
«here, for tactical reasons, special troops must be disposed in
areas heavily contaminated by radioactive material, protective body armor
arpears feasible.
Because absorption effects are almost entirely dependent
Cn the mass of the absorbent, lead appears to be the best available material.
For adequate protection, armor must consist of lead at least 2 mm thick, or
of other material equivalent to such lead thickness.
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The weight of such
armor makes impractical more than partial body protection.
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It is more
‘=portant to protect vital organs (chest and abdomen) by 30% than to
Protect the entire body by 30%.
For example, 600 r may be lethal when
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