as thers are isotopes.
Iely
a
Thus the solution of the anpropriate wmuaber
a
2
simultaneous squaticas
ylelds
the concentration of each radionuclide
2
in the soil being analyeed,
The errors involved in such a procedure
were esbinated by oraparing and counting a mcak sample consisting of
=
cr
known amounts of the varicus isotopes, and then solving the pertinen:
2
equations.
Comparison of the analytical regults with the smounts known
to be present provides a masurs cof the errors Imvolved in sech a
method.
The error in deternining cs? | for example, ves found to
be on the order of 158, with similer errors for the other figsion products.
or
a. da
a
2 2 mw.
OF wD
137
152
Table i indicates the activity in me/ui* for de?-mb” > ap! ah
143
.
mS, 2 cel4i $ and col at various tires since May 1957,
These data
hy
id
17
a
2
indjeate the
contiming accumilation
ofEa Ca",
doubling
betweon
October 1957 and September 1953 and again aimost doublin
of 1959. Because of ite 27 year half life, cs!”
tne upring
i>
is a reliable indicater
of the total faliout accumiated at any given locality.
evpear for Sr70 sinse it ig nod a gama-emitting Isotopes.
Ne figures
However,
work done in colaboration with the Health and Safety Laboratory of
the AEC reveals thats there is a fairly constant ratio of 1.6 > 0.2
between tobal Cs!37 and total Sr°C setiwity in soil (7). Therefora one
would expect the ge90 setivity to be roughly 0.6 that of Cs?»
fhe concentration of fistion activity is thus measureable, and
the Gistribubion ia depth within the soil may also be determined
empirically.
The dose arising from these verious fissien products
may be caiculated under the aseumption that the activity is spread
wuts
aco & ACE