Rate of Decay

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Rate of Decay

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1. Of a sound, the time rate at which the sound pressure level (or other stated characteristic) decreases at a given point and at a given time. A commonly used unit is the decibel per second. </dd>
2. Of a radioactive nuclide, the number of nuclei of that nuclide changing (or disintegrating) per unit time. It is usually expressed as the instantaneous rate of decay by - dN/dt where N is the total number of the state nuclides present at the given time t. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use