By means of a programmed interrogator (Figure 10 ), other data perti- 

 nent to surveying are coordinated with the radiation data and read into 

 the data display which is both real time and punched paper tape. Pres- 

 ently this additional data consists of time and line sequence data and 

 navigational data (distance to the vessel from two known shore points). 

 Concurrently with reading of above data it is possible to look at the 

 pulse height or the energy distribution of the isotope being detected. 



5. Field Support Equipment 



Tracing littoral transport requires a vessel capable of operating 

 through the surf zone where the greatest rate of sediment movement 

 occurs. Military amphibious vehicles are ideally suited for such oper- 

 ations. During initial field tests at Cape Kennedy, and subsequently 

 at Vandenberg AFB in June 1967 , a LABC-V was used to tow the underwater 

 detection vehicle and carry personnel and equipment (Figure 7, page 16). 

 Later, when more comprehensive field experiments required a hoisting 

 device, more electronic equipment, a larger power generator, and more 

 working space for personnel, the need developed for a larger craft. The 

 U. S. Army Mobility Equipment Command met this need by lending the Los 

 Angeles District a LARC-XV. 



The LARC-XV is a diesel-powered amphibious transport vehicle designed 

 to carry cargo from offshore supply vessels to beach or inland staging 

 areas (Figure 11). Normally operated by a 2-man crew, the LARC-XV has a 

 cargo capacity of 15 tons, and can move on water at speeds up to 8 knots. 

 Maximum land speed is around 30 miles per hour. Maximum dimensions are 

 i+5 feet long, l6 feet high and lU 1/2 feet wide, making long-range land 





11 



3 U W 



mW; 



Jk* 1 ->.« r <- 



m^^n^m^^jm 







¥"* ^ .-. 



Figure 11. LARC Amphibious Vehicles. LARC XV is 

 on right with loading ramp in lowered position; 

 LARC V is on left. Note back-up detector 

 vehicle carried on deck of LARC XV. 



19 



