- 29 and 82 per cent respectively of the total disintegration rate
of the gamma-emitting isotopes.
species,
At Ujelang,
in the same
wi85 accounted for 61 per cent and 64 per cent
respectively of the total disintegration rate (Table 3).
The
presence of yi85 on the leaves at Ujelang indicates that the
radioactivity found in these samples is from recent fallout
(Fig. 8).
In the Ujelang soil,
on July 19,
wi85 contributed only
17 per cent of the total radioactivity in comparison with 89
per cent for the same isotope at Belle Island corrected to
the same date.
Janet Island soil contained wi85 at a level
of 48 per cent of the total activity corrected to July 19
(Table 3).
The low value at Janet Island in comparison to
that of Belle Island is due to the former island's having been
washed by the water wave.
The low ratio of tungsten at Ujelang
Atoll in comparison to that of samples from both Belle and
Janet Islands suggests that a significant part of the radioactivity in Ujelang soil was from earlier fallout,
fallout,
activity.
containing wis |
the new
contributing only part of the total
A similar situation was observed in the soil sample
from Henry Island at Eniwetok Atoll.