207
start out and just run through the larce number of fission
products.
I am sorry thovre ave so many numbers on here, but
this summarizes ail of the fission preducts which, during the
first tca years, secur in the total mixture with a quantity of
one percent or greater,
(Siide)
This indicates the various fission products
in general here,
In the general groups here (indicating) on dom, these
are the rare earths and these materiais,
are indivicual cozponents,
in peneral, up in hero
I grouped them this way because ©
actually the plant dces not distinguish and in general tho rare
earths are all treated as thouth they were a common kind of
elenent, and you can groun othors such as the strontium-caleiun-
barium as individual entities.
We have been talking about strontium-90.
start reading across this table hore,
If you
there is loss than one
percent of the total fission product of strontium-90 at 10 days,
90 days, and by a year with this, it becones 1.8.
This strontium-90 does not increase during this time
to become 1,5,
This merely indicates the general decline of all
the rest of this mass of fission products so that the strontiun90 becomes a gradual emerzent material as constituting tko
identifiable radioactivity at that timo,
_
eee ee
What we did then was to chceose certain of these radioactive strontiuns, caesiun, iodine -- choosing some of thes