Above 50 u the relationships were obscure.
The gross decay did not vary
at all with particle size at early times, and only slightly at later times.
(U)
In the fallout from Shots 1 and 3, Sr99 and pat4© showea greater
(v)
Shot 4 fallout samples, principally liquid, obtained from a
(U)
The base surge sampling program was unsuccessful.
(vu)
No information was obtained on variations of composition with
tendency to concentrate in the liquid phase than the other fission products
studied.
project 2.5b intermiftent faliput collector, indicated that the relative
concentrations of Sr°? and Bal
increased with the time of collection.
distance.
(vu)
The preliminary reports of this work appeared as ITR-918;
a special report, CRLR 435,
WT-928
-
DECONTAMINATION AND PROTECTION.
Operation CASTLE.
Joseph C. Maloney, Ernest EH.
August 1955.
CONFIDENTIAL~RESTRICTED DATA
(U)
Dhein, and Manfred Morgenthau,
Test panels, 4 ft sq, of 14 building materials were mounted on
the weather surfaces of two remotely controlled ships and a stationary_
barge.
~~
-
allout.
All surfaces were contaminated significantly with tenacious
Vertical surfaces facing upwind became equally or more highly
contarinated than horizontal or pitched surfaces, probably due to wind
currents impacting the tenacious contaminant onto surfaces normal to it.
A sequence of hosing and vigorous scrubbing operations resulted in con-
tamination reductions of 40% to 70%, but with reductions on most surfaces
being less than 50%.
Scrubbing was the most effective decontamination
method.
Under the conditions of this test, painting and joint sealing
had little effect while the washdown countermeasure reduced the initial
contazination over 90%.
hm A ey
In each case, the activity per unit weight of active particles
Cel*4,
below 50 » was found to decrease regularly with increasing size, but in a
different manner for each nuclide, indicating radiochemical fractionation.
6
A sample of solid fallout from Shot 1 was separated into 14
parpicle-size fractions, which were analyzed for sr89, zr95, Mo99, Bal4O,