Dispersion experiments using short-term releases of an atmospheric tracer Page: 3 of 5
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Figure 1. Map of the Savannah River Plant and the surrounding
communities. The heavy line indicates the series of public roads
where air samplers were deployed for the MATS experiments. The
circled numbers designate the positions of landmarks such as
churches and bridges. The light circle is drawn with a radius of
30km from H-Area.coordinates by a map digitizer over-laying the
map in Figure 1. The accuracy of the arc
center of the sampler positions determined in
this way was estimated to be about + 200m. The
relative accuracy of sampler spacing for a
given experiment was better, perhaps + 100m,
because it was based on vehicle odometer
readings.
Time checks with the computer were made
prior to each experiment so the timing error
was less than one minute. Since completing the
first 14 MATS experiments, a LORAN system has
been added to determine sampler positions to
+ loom.
2.5 Gas Chromatography Analysis
After the samplers were retrieved from the
roadside and transported back to the
laboratory, a gas-chromatography analysis was
performed to determine the concentration of
SF6 in each canister or syringe. The
pressure in each canister was generally
slightly lower than ambient atmospheric
pressure when they arrived at the laboratory.
To facilitate the removal of the contents of
the canisters, pure nitrogen was allowed to
flow into the canisters through a manifold from
a pressurized cylinder. Each canister wasslightly overpressured with nitrogen. Then,
several milliliters of the contents of the
canister were pumped into one of three electron
capture gas chromatography (S-Cubed). The
digital result from the chromatograph was
recorded and translated into an SF6
concentration with calibration curves. The
calibration was checked three to four times for
each chromatograph during the analysis by
comparison with a known dilute concentration of
SF6. For all MATS experiments, the gas
analysis was completed in the work shift
following return of the samplers; i.e., 4:15 pm
to 11:45 pm LST. This practice minimized the
possiblility of mislabeled samples, incorrect
times, and other procedural errors.
3. ANALYSIS
The speed and direction of the SF6
cloud's movement are of practical and
theoretical interest. During the MATS
experiments, wind data were collected from a
60m tower Located within 2 1/2 km of the
release stack (H area). Additional wind data
were obtained from six 60m towers at SRP, and
from 6 levels on the 300m WJBF TV tower (22 km
from the release stack). The speed and
direction of the cloud movement inferred from
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Weber, A H & Kurzeja, R J. Dispersion experiments using short-term releases of an atmospheric tracer, article, January 1, 1985; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1058166/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.