-4-
where it was suspected that contamination
may be buried.
those data are probably not representative
Ms. Barnes has agreed to
pull
Hence,
of undisturbed areas.
the 10 and 20 cm data together and
transmit to me, hopefully in time for our June 5-6 meeting in
Livermore.
These data, although tainted by the possibility of
cross contamination
from the soil surface, may be useful for LLL’s
dose assessment model.
(9)
The length of rope used to measure distance from the center of the
IMP reading circle to soil sample locations was found to be 1 meter
too short.
The exact date when this change was made is unknown, but
it was expressed at the meeting that the rope should have been at
the correct length for the following
Vera, Olive and Aoman.
islands:
Janet, Lujor, Irene,
The other islands are open to question.
The extent of any bias in the soil-IMP regressions
is unknown.
Since the rope error would place soil samples closer to the center
of the circle than intended, the IMP values may be low relative
to soil 241Am.
A related problem is that the arrangement
and
location of soil samples within the IMP sight radius was designed
by M. Barnes using incorrect IMP calibration
indicated
information.
to me that two of the inner ring soil samples should
have been taken in the outer ring to correspond
what the IMP “sees.”
length is apparently
more closely with
The net effect on the IMP and soil Am comparisons
due to this misplacement
(10)
Ms. Barnes
of soil samples and the incorrect rope
unknown.
Different
detectors
have been used on IMP’s at different t roes. Two
detectors
had low efficiencies.
These are being corrected
but it
is not known (by John Tipton) whether these detectors were actually
i
used and if so, whether the IMP data were corrected.
Following lunch, John Tipton, Al Doles and Madaline
summarize or express any areas of particular concern.
confidence
quite well.
John Tipton expressed
in the IMP system and felt that, on the whole,
Al Doles
i
Barnes were asked
to
it was performing
(Eberline) expressed the need to do IMP field calibration
studies, and more quality control soil samples
(blind spikes) prepared by an