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Environmental and Workplace Health

Decay Scheme Uranium-238

Uranium-238   Uranium-234        
alpha decay Beta decay 1.2 minutes Alpha decay   Alpha decay straight arrow pointing down

Indicates alpha decay
Alpha decay 4.5 billion years Protactinium-234m Alpha decay 240,000 years        
Alpha and Beta Decay Thorium-234 beta decay 24 days to Protactinium-234M Alpha decay   Beta decay arrow pointing sideways (45 degree angle)

Indicates beta decay
Thorium-234   Thorium-230        
    Alpha decay 75,000 years        
    Radium-226        
    Alpha decay 1,600 years        
    Radon-222        
    Alpha decay 3.8 days        
    Polonium-218   Polonium-214   Polonium-210
    Alpha decay Beta decay 20 minutes Alpha decay Beta decay 5 days Alpha decay
    Alpha decay 3.1 minutes Bismuth-214 Alpha decay 160 micro seconds Bismuth-210 Alpha decay 138 days
    Beta decay, Alpha decay 27 minutes Lead-214 beta decay to Bismuth-214 27 minutes Beta decay, Alpha decay 22 years Lead-210 beta decy to Bismuth-210 22 years Alpha decay
    Lead-214   Lead-210   Lead-206 (Stable)
Date Modified: 2007-12-17

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