Page 248 - Radiation Safety

• Radon-222 originates from Uranium-238 or (Rn-220 from Th-

232)

• Rn-222 is a gas which diffuse out of the ground to mix with air -

breathing

• As the Rn-222 decays, its radioactive progeny, which are not

gases, can trapped in the lungs of people breathing the air

• Resulting in the lungs exposure to alpha and beta radiation

• Lung dose ranged from 2 to 8 mSv in some Canadian cities

(1979)

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