Calculadora de Cantidad Remanente por Vida Media Gratis
Calcula la cantidad de material radiactivo que queda después de un número determinado de vidas medias.
Amount Remaining
3.1250
Amount Remaining vs Initial Amount
Fórmula
## Remaining After n Half-Lives Each half-life reduces the remaining amount by half. After n half-lives, the fraction remaining is (1/2)^n. ### Formula **N = N0 × (1/2)^n** This applies to radioactive decay, drug elimination, chemical degradation, and any first-order process.
Ejemplo Resuelto
Starting with 100 grams, after 5 half-lives.
- 01Remaining = 100 × (0.5)^5
- 02Remaining = 100 × 0.03125 = 3.125 grams
- 03Only 3.125% remains after 5 half-lives
Preguntas Frecuentes
How many half-lives until less than 1% remains?
After 7 half-lives: (0.5)^7 = 0.78% remains. So 7 half-lives reduces the amount to less than 1% of the original.
Does this work for drug elimination?
Yes. Drugs eliminated by first-order kinetics follow the same math. A drug with a 4-hour half-life is essentially gone after 5-7 half-lives (20-28 hours).
Can n be a fraction?
Yes. After 2.5 half-lives, the remaining fraction is (0.5)^2.5 = 0.177 = 17.7%. The formula works for any non-negative value of n.
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