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www.reference.com/science/calculate-radioactive-decay-6fa004cbeb64e777

How Do You Calculate Radioactive Decay? An element's radioactive decay can be determined through a single equation which requires imputing the isotope's half life, its rate of decay and the decay time since the rate of decay is measured.

sciencing.com/calculate-radioactivity-6314042.html

How to Calculate the Rate of Decay. ... This process is called radioactivity or radioactive decay. Elements with atomic number 83 have more than 82 protons, and so are radioactive. Isotopes, which are elements where the nuclei have different numbers of neutrons, may also be unstable. ... To calculate radioactivity, it is necessary to know the ...

www.radprocalculator.com/Decay.aspx

Radioactive Decay Useful for calculating today's activity for any radioactive isotope. 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 ...

www.wikihow.com/Calculate-Half-Life

How to Calculate Half Life. The half-life of a substance undergoing decay is the time it takes for the amount of the substance to decrease by half. It was originally used to describe the decay of radioactive elements like uranium or...

www.calculator.net/half-life-calculator.html

Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The term is most commonly used in relation to atoms undergoing radioactive decay, but can be used to describe other types of decay, whether exponential or not. One of the most well-known applications of half-life is carbon-14 dating.

answers.yahoo.com/question/index?qid=20111009162252AAgAS2H

How do I calculate the decay of a sample with multiple radioactive isotopes? help me with this physics question: A sample of radioactive Indium contains equal quantities of In(116) with a half life of 1.0 hours and In(114) with a half life of 50 days.

softschools.com/formulas/chemistry/rate_of_decay_formula/131

2. Calculate how long it will take for 25% of a U-238 sample to radioactively decay. Answer: If 25% of the sample has undergone radioactive decay, then the ratio of = 0.75 because 75 percent of the original sample remains. The rate of decay constant for U-238 will be used from the previous problem. 1.86 x 10 9 years = t

softschools.com/formulas/chemistry/radioactive_halflife_formula/113

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay. For example, if the half-life of a 50.0 gram sample is 3 years, then in 3 years only 25 grams would remain. During the next 3 years, 12.5 grams would remain and so on. To answer this question ...

www.coolmath.com/algebra/17-exponentials-logarithms/13-radioactive-decay-decibel-levels-01

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!