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Radioactive decay is the process by which an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type transforming to an atom of a different type. There are three types of radioactive decays, namely alpha, beta and gamma. Radiation materials are dangerous. Exposure to radiation may cause genetic mutations leading to diseases like cancer.

Radioactive Decay Law formula is:
  N = N₀e^{-(0.693t/T_1/2)}
Where:
N: Activity at time 0
N₀: Initial activity
t: decay time
T_1/2: half time of the radioactive material

The calculation assumes that 1 year = 365 days, and 1 month = 30 days.