Smithsonian Report, 1964. — Cowan 



Plate 3 



1. Three 1,200-gallon steel tanks on a flat-bed trailer comprise our tank farm. With a 

 network of stainless-steel pipes and valves, along with special pumps, the apparatus was 

 used to mix and transport our load of scintillating solution from Los Alamos to the Sa- 

 vannah River Plant. The tanks are coated with epoxy on their interiors and were later 

 wrapped with layers of electrical heating strips on their outsides, then covered with 

 fiber-glass insulation. On the trip to South Carolina, they were plugged into the elec- 

 trical outlets of kindly filling-station operators to warm up overnight; they kept sufficient 

 heat during the next day's run to preserve the solution. 



2. The final test of our signal was to shield the entire detector even more so than neutrons 

 and gamma rays would be further attenuated. The signal, however, did not change, 

 unless the reactor was turned off. The shield, shown here, consisted of many bags of 

 sawdust, saturated with water, and had a mean density of 0.5. It was over 4 feet thick 

 at all places. A pound of hominy grits, placed near the center of this face of the shield, 

 completed it in a little ceremony in salute to our southern hosts. 



