30 LITER NISKIN 

 BOTTLE' 



•NEPHELOMETER 



TRIP MECHANISM 



BOTTOM PROXIMITY 



PINGER ** 



21 



CTD SENSOR PROTECTION CAGE 



■ 8 ON DEEP CAST, 12 ON OTHER CAST 

 'ONLY ON DEEP CAST 



Figure 9 GEOSECS underwater sensor package. 



Large-Volume Water Sampling 



Large-volume water samples are required for many of the radioactive 

 elements that will be measured during the project. Analysis of C* re- 

 quires 200 liters; Sr^o and Csi", 100 liters; Ra^^e, IQO liters; Ra^^s, 800 

 liters; and particulate matter, 250-400 liters of sea water. In some cases 

 the same sample may be used for two or more measurements. 



The requirement of 18 large-volume samples per station necessitates 

 the use of multiple sampling devices on a single wire. Initially, it was 

 hoped to use 1500-liter canvas bag samplers. Extensive testing during 

 three recent cruises proved the samples extremely difficult to bring aboard 

 ship, and in a number of cases samples from supposedly deep water clearly 

 contained mixtures of water from shallow depths. 



