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C. 40 feet is correct

 

 

                                             Exposure Rate  X  Distance2

Zone Distance = —————————————————————-

                                                       NCRP Guideline

 

 

                                                0.1 mR/hr  X  (178 feet)2

Zone Distance = —————————————————————-

                                                             2 mR/hr

 

 

                                                     0.1 mR/hr  X  31,684 feet2

Zone Distance = —————————————————————-

                                                             2 mR/hr

 

 

 

                                                               3168.4 mR/hr feet2

Zone Distance = —————————————————————-

                                                                   2 mR/hr

 

 

 

Zone Distance = 1584.2 feet2

 

 

 

Zone Distance = 39.8 feet

 

Zone Distance = 40 feet

 

 

 

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