XIV. WggMBearoic ENERGY COMMISSION AND OAK RIDGE NATIONAL LABORATORY
REPORTS.
y-685
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-~
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FILTRATION OF S03 GAS MOLECULES BY TYPE 6 PAPER.
Jess W. Thomas, 9 November 1950.
SECRET~RESTRICTED DATA
-
WE Dry SO3 gas when discharged into the air, forms a white fog due
to the prompt combination of the gas with water vapor, resulting in a
diffusion of sulfuric acid in the air.
It was observed that if dry 503
were passed through an ElR2 aerosol canister containing two layers of
Chemical Corps type 6 filter material, no visible cloud appeared as
effluent. The observation promoted tests to determine whether this filter
medium could indeed quantitatively remove such a gas or, as the author
puts it, "atomic-size particulates."
Two experiments were conducted which showed that mole quantities
of S03 gas were completely filtered, or sorbed, by two layers of type 6
paper construed to mean, within experimental error, that all heavy gas
molecules flowing through the canister contact the filters en route and
are sorbed.
It was further concluded that newly formed, radioactive
Y-700
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PREPARATION OF RADIOACTIVE METHYLENE BLUE FROM 835 LABELED
SODIUM THIOSULFATE.
H. R. Bronstein and E. G. Strwmmess, 8 January 1951.
SECRET
A tracer compound was synthesized for use as an agent in checking
present methoés of evaluating the efficiencies of smoke filters against
particulate aerosols.
thiosulfate.
Radioactive sulfur, 339 » was used in making sodium
This in turn was used in the synthesis of S53) labeled
nethylene blue by use of a modification of Bernthsen's method.
Y-791
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<A FLOW-TYPE IONIZATION CHAMBER FOR MEASUREMENT OF ACTIVITY IN
LOW ENERGY BETA EMITTING GASES.
R.
L. Quinn, 1 August 1951.
UNCLASSIFIED
(u)
A nethod is presented for the measurement of activity under
conditions of flow over a wide range of activities of gases that emit
_ low-energy beta rays. $3705 gas was measured at flow rates of 32 liter/min
-Wwith activities ranging from 10719 ¢6 1072 curie/liter. Using this method,
- it is possible to continuously monitor the activity level of a radioactive~ ges stream.
~
°
Te
daughter-products of rare gases may be expected to behave similarly.