radionuclides within the NTS, and to assist in providing guidance for
the possible cleanup of plutonium-contaminated areas.
Progress in this project has resulted primarily from experiments
carried out at the intensive study location at the GMX site in Area
5.
In addition, less elaborate measurements have been conducted at
several additional areas of plutonium contamination.
Off-site experi-
ments concerning parameterization of dust fluxes and mass loadings
have been conducted near Plains, Texas.
Interim models developed
from these studies have been utilized in radiological assessment of
the reoccupation of Enewetak Atoll and in the environmental assessment
of liquid-metal fast breeder reactor technology.
PAST ACCOMPLISHMENTS
Nine reports
(see References 1 through 9,
this report) have been
published or submitted for publication since July 1, 1974.
These
publications cover in detail the experimental measurement programs,
results of measurements, and the data analysis including model development which has resulted.
Additional data have also been collected
which are not covered by these publications and include measurements
of the concentration of the plutonium in air at other NTS locations
in addition to the GMX.
some highlights of these past accomplishements are listed below:
1.
Concentration of resuspended plutonium in air has been measured
over short time periods of consistent meteorology with the use
of ultrahigh-volume air samplers (1,500 m>/fhr) .
Simultaneous
measurements of wind speed and temperature profiles, in addition
to other meteorological variables, have provided the first welldocumented set of resuspension measurements made over short time
periods.
Important meteorological parameters, friction velocity
(u*), surface roughness length (Zz), and Richardson number (Ri)
*The resuspension factor is the concentration in air divided by the
surface deposition and has units of mt,
93