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Absolute Dating
Radioactive Parent Stable DaughterProduct
Half Life Values
U-238 Pb-206 45 Billion Years
U-235 Pb-207 713 Million Years
Th 232 Pb-208 14.1 Billion Years
Rb 87 St-87 47 Billion Years
K - 40 Ar-40 1.3 Billion Years
C -14 N-14 5730 Years
• In this example, each time this happened, 10,000 years had gone by.
• So if it happened 3 times, then the object is:3 x 10,000 = 30,000 yrs old
Parent: 16 8 4 2 Daughter: 0 8 12 14
Absolute Dating – What Proportion is Left?
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