Datação por Decaimento
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
Radioactive Decay Dating calculates the age of organic or inorganic samples using the decay of isotopes like carbon-14. The formula t = −ln(N/N₀)/λ is applied, where N is the current isotope quantity, N₀ the initial quantity, and λ the decay constant. This method is vital in archaeology, geology, and environmental science to date fossils, rocks, and other materials.
To use the calculator, input the ratio of current to initial isotope quantity and the decay constant. The formula calculates the elapsed time since the organism's death or rock formation. Sample contamination must be avoided, and the isotope's half-life should be accurately known for reliable results.
Practical applications include dating historical artifacts, sediment studies, and environmental research. Accuracy depends on measurement quality and the assumption of constant decay rates. For very old samples, isotopes with longer half-lives (such as uranium-238) may be more suitable.
Frequently asked questions
What formula is used to calculate age?
The formula is t = −ln(N/N₀)/λ, where N is current isotope quantity, N₀ is initial quantity, and λ is the decay constant.
What types of samples can be dated?
Organic samples like bones and plants, or inorganic materials like rocks, provided they contain known radioactive isotopes.
How accurate is this method?
Accuracy depends on sample quality and measurement precision. Contaminated or extremely old samples may yield errors.
Is there a limit to the age that can be measured?
Yes, it depends on the isotope's half-life. Carbon-14 works up to ~50,000 years, while uranium-238 can date billions of years.
Can I use this to date living organisms?
No, because the method requires the isotope to stop replenishing. Living organisms maintain equilibrium with their environment.