pene
tem Ba sot
ie
1
~26-
radioactive
Ftne shore birds contained greater amounts of
tissues shortly after the
prisls in the different organs and
A similar tendency was
Rout at Rongelap than did the terns.
» in 1952 at Eniwetok
WL-33)).
following Mike shot (see WT-616
However, the average levels of activity in the
ans of the shore birds decreased more rapidly with increasing
.
after fallout than did those of the terns.
These differ-
les may be accounted for, in part at least, by the differences
feeding habits and migrational characteristics.
| Rongelap terns are given in Table V.
With the exception of
bs he och icin ies ge ee
pee ie ci aa
is
ena
Slat
er
<
The average specific activities of the organs and tissues
scle, which is consistently low compared with the other
Bsues, there is no distinct pattern of relative activities
eween different organs.
|
The decline of radioactivity levels in the organs and
psues of terns may be divided into three types (Figures 10a
: b):
(1) organs in which the decline is semilogarithmic,
Bf-life 40 days-- these include the muscle, liver, and
pny; (2) organs in which the decline is logarithmic -~ these
the bone (r = t7£+35) and ileum (r =
t72-85), and (3) organs
which the vartability is extremely great -- the skin and lung
present this group.
} The shapes of the radioactivity decline curves for the
pferent organs are determined by @ combination of (1) avail-
Llity of the isotopes, (2) total uptake and degree of selec-
ye uptake of different tsotopes, (3) radioactive halflife,
(4) biological half-life.
Since the relative effects and
floblological Studies . . . op. cit., p. 6.
oO