.
I. i.
/
3
Subsequent to scraping the sidewall to avoid any possible contamination 7” 4 AdeAL
Sed
from the digging process.
,
d
The 0-5 cm sample was collected froma .
surface area about 25 cm on a side.
The area was then expanded by about
10 cm on each side and cleared to a depth of 5 cm.
The upper surface
(1-2 cm) of this enlarged area (35 cm x 35 cm) was then cleared to
ensure that no surface soil, or soil from a preceding increment, had
fallen onto the next increment to be sampled.
The next sample was then
taken from the entire depth of the increment (i.e., 5-10 cm) from an
area about 25 cm square within the enlarged region (35 cm x 35 ecm).
This procedure was repeated until the final increment of 40-60 cm had
‘been collected.
A total of approximately 500-900 ¢ of soil was collected
for each profile increment.
The soil
fine powder.
samples were dried,
screened, and ball milled into a
Samples were then analyzed by gamaa spectroscopy to deter-
mine the !37cs concentration and by wet chemistry procedures to determine the concentration of 2%sr and in some cases 239+240p,, | 24) gs
and 241 py,
Gamma spectroscopy of the soil samples for 137¢— was
accomplished using Nal Crystals and high resolution,
nium diode systems.
Strontium - 90,
239+240p,,
solid state germa-
24) ag,
and 241 py
were analyzed by current state of the art wet chemistry procedures by
Eberline Corporation.
The radionuclide concentration for the profile for 0-5 cn,
0-10 cm, 0-15 cm,
0-25 cm,
0-40 cm,
and 0-60 cm, were calculated using
equal weights for each 5 cm increment.
The island average for each
“depth profile (i.e., 0-5 cm, 0-25 cm; 0-40 cm, etc.) were calculated by
averaging the results for each profile taken on the island.
The results
are summarized in Appendix G.
5a
oe