Page 661 - Radiation Safety
P. 661
BACKGROUND RADIATION
Natural Radiation Source Man Made Radiation Sources
1. Cosmic Rays 1. Medical X-ray (0.2 mSv
per chest x-ray), nuclear
2. Cosmogenic nuclides – C , H , N 15
3
14
resulted from interaction between medicine (diagnostic and
cosmic rays and particles. therapeutic)
2. Nuclear weapon test –
3. Primordial radionuclides –
coexisted during the creation of radioactive fall-out
Earth 3. Nuclear power
8
• Long half-lives (> 10 years) 4. Nuclear technologies in
o Series: Uranium-238, Uranium-235, industries.
Thorium-232
o Non-series: Potassium-40, Rubidium-87 5. Consumer products:
smoke detector,
luminous watches, gas
mantles, TV (very low)
