Data Collection System 



Individual signals from the four detectors are fed through cables to the 

 surface vessel and into a mixer. A differential discriminator sorts the 

 proper signals and feeds a multichannel analyzer (PIP-^00) (see Fig.C-3) 

 that can operate in a pulse-height mode or in a multiscaler mode (normal 

 operating mode for survey is the multiscaler). This system stores counts 

 from the detector for a time set by the operator. The possible accumula- 

 tion times are 10, 1, 0.1, and 0.01 sec. The information can be displayed 

 on an oscilloscope, typed out on a teletype unit, or punched on a tape. 



In the multiscaler mode the analyzer operates as U00 individual counters. 

 A counter stores the signals from the detectors for the time set by the 

 operator. The analyzer automatically changes from counter to counter 

 according to the preset time intervals. With a data accumulation time of 

 10 sec, an uninterrupted survey can be conducted for 4000 sec, or approx- 

 imately 65 min . At the end of the period the data must be typed and 

 punched on tape, which requires approximately U.5 min. With this system 

 the starting time as well as the position coordinates must be logged. All 

 data must be correlated with the time and position log. 



CAPE KENNEDY FIELD OPERATION' (APRIL I967) 



Purpose 



The operation was conducted in the beach area adjacent to Cape Kennedy, 

 Florida, and was the initial field trial for the ORNL Underwater Survey 

 System. The major objective was to. check the operating characteristics 

 of the detector system and the towing characteristics of the cylindrical 

 detector housing. 



Operational Procedure 



A 1.^5-kg batch of sand that had been tagged with 30 mCi of 133 Xe by the 

 techniques described in Addendum C-2 was used. Scuba divers placed the sand 

 within a 3-ft-dia area at a water depth of 30 ft, approximately one-half 

 mile off the Florida coast . The underwater detector was towed through the 

 area by an amphibious vessel (LARC V) . Wo navigation system was used, and 

 no established search pattern was followed. The purpose was merely to de- 

 termine whether the detectors could detect the 133 Xe-tagged sand that had 

 been placed on the ocean bottom. Initial passes through the injection 

 area showed no activity. The search was expanded, and the tagged sand was 

 detected approximately 100 yards from its original injection area. 



A device to inject k-0- liter batches of sand onto the ocean bottom was 

 tested for shipboard operation. Sand placed in a hopper was flushed from 

 the hopper through a 1-in. hose that reached to the ocean bottom in about 

 30 ft of water . A pump with a flow rate of 12 gpm was used to supply salt 

 water to the injection system, and no difficulty was experienced in trans- 

 ferring sand from the hopper to the bottom. 



C-12 



