pyroid containingsredoainantty2,
I
mentioned in the weston
on birds.
Te
Among the 23 plates counted most often ( 10 ~- 73 times) and
presumed to be counted frequently enough toe detect the existence
z ef a linear semt~log relationship, only one other sample was
: more nearly linear by semiwlog than by log-log plot.
This wes
the gastric mill ofa ereb, Grapsus8 grapsus, taken March 26,
41954, at Kabelle.
The ‘staph (Figure 11) was sufficiently curved
_to indicate the presence of, moré than one isotope. The early
portion 50 « 300 days gave-a halfelife of 78 days, and the
portion. 300. = 439 days gave ahalf-life of 107 days.
A section of
“the curve of another sample, manele of sea cucumber (Figure 11),
/ Was typleal of gent-1og linearity+ the, radioactivity of this
sample decayed over the period from 50 te nearly 200 days with
a half-life of “about 75 days, but more slowly later,
Although a’ single isotope displays a domwardly soncave
curvilinear plot by log-log presentation, a mixture of ae few
as two taotopes with half-lives of similar ordersof magnitude,
guch as eet and ceh*4 of 30- and 280- day half-lives, may
appear almost Linear on & logelog plot over the period. ar
7S to 500 days.
,
Most decays were beat suited to log-log Plottingas seen
in the seven ousimpleis4
dn1Fagures 2
12 and. 13.
Although acme appear
slightly curved, straight lines warefisted and slopes were
sealed graphically
eM a
oFGEEGomes
te
“Deftattion.of.the.gurves ‘requires‘evaluation’notnlyof
FR rerpartarene:
Ob
Sta.
Seti
poreice: