:
Concentration Ratios.
avail- able at Enewetak Atoll.
Very few locally grown crops are
i
i
The test plots established on Enjebi
(Janet) Island have provided data for that island; other than these test
plots, the available trees are limited to one or two isolated trees on
four or five islands in the northerm section of the atoll.
Coconut
trees are available in the southern half of the atoll but the
radionuclide concentrations are very low and it is difficult to develop
reliable data.
As a result of the scarcity of locally grow foods at Enewetak
which can be directly analyzed, we have developed concentration ratios
between food products and soil (pCi/g wet weight in food/pCi/g dry
weight in soil) for each radionuclide, using data obtained from our test
plots on Enewetak and Bikini Atoils, from the coconut trees on Bikini
Atoll which are now producing fruit, and from the few isolated trees on
4 islands at Enewetak Atoll.
The mean,
standard deviation, median and
the high and low values for the concentration ratios developed from
“samples collected through November
1978 are listed in Tables 10-13 fer
1376.) 90s,, 23942405, and for 241 poy respectively.
The
concentration ratios are developed from soil profiles taken to a depth
of 40 cm through the root zone of the plants being sampled.
This depth
is used because from our observations thig depth encompasses most of the
root zone of the subsistence plants we have looked at on Enewetak anc
Bikini Atoll.
A report on the root activity (10) of large mature
coconut and banana trees showed most of the activity in the 0-60 cm
depth which is consistent with our observations of the physical location
a