ppssesces: 
£ vi P ste sagt 
Ra. 
Derek W. Spencer of Woods Hole Oceanographic Institution, a member of 
the GEOSECS Executive Committee, and Arnold Bainoridge of Scripps In- 
stitution of Oceanography, project director, man the control console 
during a GEOSECS test cruise. 
distributions of the cosmic ray produced radioisotopes ey and Sie 
with half-lives of 5700 and 700 years respectively, must be compared 
with those of stable carbon and silicon in order to use the "clocks". 
Similarly, the distributions of the man-made fission products Bien and 
cs 137 
can be corrected for particulate effects by observing the distri- 
bution of natural strontium and cesium in the sea. The GEOSECS pro- 
gram is designed to give the first detailed information of such distri- 
bution patterns by measuring sirultaneously the distribution of all of 
the most important tracers and properties along oceanic sections. 
