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hichest radioactivity in the old tovwm side of Eanrord along the
shore with a rapidly Ciminishing activity dovwnstrcan.
fate
I hope you anpreciate wnat this relative activity
Gersity is on all of thess slides,
You mevoly take the hichest
valus on tho chart as 100 porsont and express those other values
43
in tesems of pevcentates ef the most radicsetive matorial,
his particular curve (indicating) is for Plankton
waich has a fair short-lived conponent so that the activity
Greps off 2s we go downstream due to tivo or threa major factors.
Gne of
theso is time for physical decay of the shorter-livod
materials,
Another ons is a peculiarity of crons of our sampling,
af,
Cs,
and most of this represents in that collection along shore or
in areas where the efflusnt hos not been completely dispersed -you will recall in the fivst slide we had a band of offluent which
went cown the river before it became dispersed throughout the
river as a waole,
Of covrse, some of this fast drop-off is a
result of better distribution of the effluent throughout tho
river as a whole,
We have these two factevs and we also have
incorporation of these radionctive materials into the biolozical
forn which draws them into a biological pcol and whica makes then
evailable for further radioactive decay for this whole mass of
radioactive material is finally moved down the rivor.
This curve (inJicating) as I said, is typical of
Planiton.
We can draw different ones for each organism and get
slightly different Slonos.
at
-~
If we draw this (indicating) fer the