Sea and of the Sea into the Atlantic Ocean and (c) long term 
(26) 
accumulation and its effects. 
Radioactive Tracer Experiment Possibilities. 
A radioactive tracer experiment should furnish sufficient 
information about the diluting capacity of the ocean and about the 
effect on marine Be The first thing to determine is what 
can be learned in any experiment. In a deep water experiment you can 
learn about rates of horizontal and vertical diffusion and perhaps 
something about currents, either tidal or net drifts. In an experi- 
ment nearer the surface the same things can be learned, in addition 
to something about the rate of transport through the main thermocline 
which ultimately will be important and necessary to sample. Many 
experiments will be required before any definite conclusions are 
“Nae 
A proper experiment may be one wherein a large quantity of 
radioactive material is placed in bottom water. The movement there 
should be slow enough to enable tracking for a long time unless some 
(9) 
Organisms precipitate out the activity. 
Magnitude of Experiment Required: Navigation or precise 
certainty of position determines the size of the tracer experiment 
required. The contaminated area cannot be smaller than 2 miles on 
a side or it will not be found. There should be enough radioactivity 
to cover an area 50 miles in diameter at easily detectible levels 
at the time results are measured. A 50 mile area can be eee 
to and is small enough so that it will not get out of hand. One 
ship can make a survey of this sort. It will be necessary to set up 
“65's 
