HANDLING OF RADIOISOTOPES WITH ANIMALS AND PLANTS 119 



Nevertheless the surfaces should he smooth, crack-free, and uouporous. 

 Porous wall materials should he coated with a uouporous, washahle paiut 

 and preferably with a final layer of strippable coating. If physically 

 possible, the walls may be finished with a hard-surfa(;ed Masonite or 



Feei 



M I I I I I 

 2 4 6 



Cabinets (over) 



r 



Main born 



1 



Fig. 4-4. Typical arrangement in barn for the use of radioisotopes with farm animals. 

 A, office desk; B, hot sink; (\ hot-waste drum from B\ D, storage cabinets; E, labo- 

 ratory bench; F, sink; G, radiochemical hood; H, worktable; /, cave with drawer-type 

 isotope units. 



Transite sheeting laid over suitable furring. Stainless-steel plywood- 

 laminate panels or coated mild-steel panels have been used for this pur- 

 pose but are somewhat more expensive than the simple lath-and-plaster 

 wall. 



The wall and ceiling coating should have the following properties : ease 

 of decontamination by washing, chemical resistance, and ease of removal 

 and replacement in case of severe contamination. For low- and medium- 

 level rooms, nonporous paints or hard-surface enamels should be ade- 

 quate. In general, the vinyl paints show good chemical resistance. 



