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1. Half Life Definition - The time it takes for half of a radioactive substance to decay 2. How to calculate the final amount that remains in grams, percent, and as a fraction 3. How to calculate ...

RADIOACTIVE DECAY: Ever heard of Plutonium? It's the stuff we use in our nuclear things -- weapons, submarines, etc. Plutonium-239 has a half-life of 24,110 years. "Half-life means that, if you have 100 pounds of Plutonium-239... In 24,110 years, you'd still have 50 pounds left... In another 24,110 years, you'd still have 25 pounds left.. This stuff just won't go away!

www.gigacalculator.com/calculators/half-life-calculator.php

Free online half-life calculator. Calculate the time passed, original amount, half-life, or resulting amount based on any of the three values. Convert half-life to mean lifetime or decay constant. Date a sample based on radioactive decay (exponential decay). Half-life chemical calculator.

www-naweb.iaea.org/napc/ih/documents/global_cycle/vol I/cht_i_06.pdf

Equations of Radioactive Decay 6.2 HALF-LIFE AND MEAN LIFE It is a common practice to use the half-life (T1/2) instead of the decay constant ( ) for indicating the degree of instability or the decay rate of a radioactive nuclide.

You may also back decay sources to find out the original activity (or for any date), knowing the current activity. If the isotope that you wish to decay is not on the drop down list, check the 'not listed' check-box and manually enter the isotope name and its half-life to perform the calculation.

Decay Law – Equation – Formula. The radioactive decay law states that the probability per unit time that a nucleus will decay is a constant, independent of time. This constant is called the decay constant and is denoted by λ, “lambda”. This constant probability may vary greatly between different types of nuclei, leading to the many different observed decay rates.