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<math>𝑁(𝑡)=𝑁_02^{−𝑡/𝑡_{1/2}}</math>
Where:
𝑁(𝑡) is the number of undecayed [[Atomic Nucleus|nuclei]] at [[time]] (𝑡)
𝑁<sub>0</sub> is the initial number of [[Atomic Nucleus|nuclei]]
𝜆 is the [[Decay Constant|decay constant]] for the [[isotope]].
===Examples===
The [[Decay (Physics)|decay]] curve of Uranium-238 showing its decrease over millions of years.
Monitoring the [[Decay (Physics)|decay]] curve of medical isotopes to ensure they remain effective for treatment.