Still detectable in the soil are mn>4,
zn©? ,
sr 29,
zr?>,
RuLOG |
Sbi25_
csi37,
Fe>>,
Co?7,
C069,
cel44 and Eul55 which
remain concentrated in the upper one to two inches.
Where
higher levels of radionuclides have been present these isotopes
have been reported in a wide variety of organisms.
It is likely
that most of these radionuclides are actually present in most if
not all organisms at Rongelap but that the levels at which they
occur are extremely low and so escape detection.
Passing from the soil to the soil solution,
the term being
used here to mean leachates collected in the field from lysime-~
ters,
Sr 90"
csl37,
and sbl25 are the principal nuclides found,
although Rut06_pp106 |
et al.,
1961).
cel44 ang Eul95 are also detectable
(Cole
Here differences exist with respect to soil type
in that the leachates from immature soil,consisting almost
exclusively of parent material,contained
only sbl25 ana sr9°.
There is to us no evident explanation for this
difference.
The ground water probably contains these nuclides since
their movement has been detected in leachates to depths of 30
inches, but the levels are so low in ground water that special
techniques would have to be developed to detect them.
90
The land plants contain principally Cs 137 and Sr”~.
and zn©®> have been found in plants
Mn>4
from the more heavily con-
taminated islands but are present in relatively insignificant