Since it is a stochastic (random) process, the decay rate of a particular atom cannot be predicted, but it can be for a group of atoms of the same element and this is the basis of radiometric dating. Certain highly excited short-lived nuclear states can decay through neutron emission, or more rarely, proton emission. A material containing such unstable nuclei is considered radioactive. "nuclear decay", "radioactivity") is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion. The half-life calculator results are accurate to the 16-th decimal and are usable in physics, chemistry, etc. Months are approximated to 30.5 days, years are approximated to 365.2421 days. Supported units are nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, and years. Our versatile radioactive decay calculator supports many different time units and automatically converts them if the time unit you measure the time elapsed is different than the time unit you enter the half-time, decay constant or mean lifetime in. Calculate the remaining quantity of a radioactively decaying element given its initial quantity, its half-life (or decay constant, or mean lifetime), and the time it was decaying for.Calculate the initial quantity of a radioactive element, given its current quantity, its half-life (or decay constant, or mean lifetime) and the time it was decaying for.
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