# Rate of Radioactive Decay

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226-88 Ra, a common isotope of radium, has a half-life of 1620 years. Knowing this, calculate the first order rate constant for the decay of radium-226 and the fraction of a sample of this isotope remaining after 100 years.

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The expert determines the rate of radioactive decay.

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he rate of radioactive decay is expressed by the relationship:

k = 0.693/t1/2

where k is the rate and t1/2 is the half-life.

Plugging in the half-life given in the ...

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