☢️ Isotope Dating

Select method:

¹⁴C (t½ = 5,730 yr) K-Ar (t½ = 1.25 Gyr) U-Pb (t½ = 4.47 Gyr) Rb-Sr (t½ = 48.8 Gyr)

Measured N/N₀ ratio: 0.500 Initial ratio (N₀): Measurement uncertainty: 2%

Calculated age—

Age uncertainty ±—

Half-lives elapsed—

Concordance—

Radioactive Decay
N(t) = N₀·e^−λt
t = −ln(N/N₀)/λ
t½ = ln2/λ
U-Pb concordia: plot ²⁰⁷Pb/²³⁵U vs ²⁰⁶Pb/²³⁸U — concordant samples lie on Wetherill curve.