55.
Lockhart, L. B.3 Baus, R. A.3 and Blifford, I. H.
ATMOSPEERIC RADIOACTIVITY ALONG THE 80th MERIDIAN,
1956.
1957.
U. S. Naval Research Laboratory. July,
15 pe Washington, Office of Technical
Services.
$0.50.
PB131081.
Measurements of atmospheric radioactivity and fallout
at a number of sites along the 80th meridian (west)
oe
es,Se
are reported for the year 1956. These results were
obtained through the combined efforts of the U. S,.
Naval Research Laboratory and the Meteorological
Services of Chile, Peru, and Ecuador with the coope
eration of the U. S. Weather Bureau and the U. S.
Atomic Energy Commission. Radioactivity levels at
the various sites during 1956 are reported for three
different collecting systems: air filters, cloth
screens, and gummed films. Extremely wide variations
in the gross radioactivity of fission products in the
air have been noted, with highest levels occurring in
the Northern Hemisphere.
The presence of some of the
peaks of activity at various localities has been
correlated with known atomic explosions.
56.
Lockhart, Luther B.
RADIOISOTOPES ON YOUR ROOFTOP.
Education 34, 602 (1957).
JournalofChemical
Rain H20 and dry fallout were collected during a 2-week
period by using a plywood platform (8 feet square)
covered with 4-milpolyethylene (I).
The material was
passed over a column consisting of a leitnch band of
filter paper pulp, a 2=inch band of cation-exchange
resin, and a leinch band of anion-exchange resin in
a piece of leinch (internal diameter) I tubine.
Less
than 2 per cent of the gross Beactivity passed through
the column.
The contents of the column were dried,
ignited at 650°, and the ash was analyzed radio-
chemically. Values for activity (disintergrations/
min., d./m.) and rate of deposition (d./m sq.ian,
and atoms/sq,ft.coll: res
34
were, esPes per git 600,
13, 3.5 x 102
606, oe, 1.4 x 10
5369
7,000, 8, 8.7. x 169; vot: gh?’ 900, 25, 29x11
11,600, 13, 704 x 40°: sr
1,900, 2, 6.0 x» 107;
850, 1, 202 x 107; ott”
BielY, "960, 1, 2x 107.
19