HANDLING OF RADIOISOTOPES WITH ANIMALS AND PLANTS 



123 



Experience has shown that the best of fume hoods cannot guarantee 

 absolute freedom from laboratory contamination. In dealing with par- 

 ticularly hazardous materials, the gloved box, illustrated in Fig. 4-7, should 

 be used. A small blower maintains the box at a slightly reduced pres- 

 sure, and the exhausted air may be filtered before being passed into the 



Fx/iousf 

 ducts 



Fluorescent light built 

 in opposite side 



Service 

 valves 



Vacuum 

 rack 



Glass end 

 windows 



Stainless 

 steel tray 



Sliding 



glass 



doors 



Electrical 

 outlet 



Chemically resistant 

 heavily enameled 

 wood construction 



Fig. 4-6. Typii-al hood for C'^ or work requiring vacuum-line technique. {From 

 Donald R. Ward, Design of Laboratories for Safe Use of Radioisotopes, AECU-222(), 

 November, 1952. Courtesy of Atomic Energy Commission.) 



main hood stack. For some types of work a simple box without a blower 

 may be satisfactory. Depending upon the type and amount of work to 

 be done, the gloved-box system may be used as an economical replacement 

 for the fume hood. 



Isotope Storage. Radioisotopes must be stored so as to present no 

 hazard to persoiniel and so as not to interfere with counting or photo- 



