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Examen
ARRT MOSBYS safety review Questions with Complete Solutions, A+
Natural background radiation represents what amount of human radiation exposure? - 50% 
 
The greatest source of natural background radiation exposure is? 
Cosmic rays 
radioactive materials 
the body itself 
radon gas - Radon gas 
 
Cosmic natural background radiation is a part of _______________ _____________ exposure. - Natural background 
 
Radon gas: 
 
a. Presents a danger when undetected 
b. Is present in doses proportional to other sources 
c. Is entirely human-made 
d. Is the s...