(25) 
enough so that waste density would not be significant. The 
sampling problem may become more difficult if the material diffuses 
downward whereas on the bottom one dimension would be sauce 
The sampling problem may be alleviated if the radioactivity can be 
measured aeons possibly by towing the instrument through the 
area of activity much like the mid water trawl is aa Depending 
on the speed of towing a length of cable as much as 3 times the depth 
might be een Wertine of has a photomultiplier 
which can go to a 6000 ft. depth. If a scintillation cell is put 
in front, it would be readily adaptable to this experiment. Plate 
power is sent down from the surface. Again, however, if the instrumezt 
is submerged continuously the walls of the cell are likely to pick 
up Lacieneeie but it may be that stainless steel window and 
walls (to measure gammas) will alleviate that aoe 
Convection in Surface Waters: In the ocean surface water is 
being cooled more than half the time in the winter months. In the 
summer months it is being cooled less than half the time by evaporation 
in many areas. This cooling sets up a complicated pattern of motion 
(convection cells) moving the water along in a helical pattern. When 
well developed, the convection cells are very large and vary in size 
with changes in wind velocity. Any surface experiment will require 
much study to account for all of the large scale motions that hee 
Place and Time for Experiments: In the Sargasso Sea area 
hurricanes are a source of worry particularly in the autumn. In the 
spring the surface layers are rather stable over all of the Sargasso 
Sea except on days when the winds blow full force. It may be better 
=70e 
