Natural radioactivity or nuclear decay is a radioactive decay process in which at a given time a certain number of atoms disintegrate spontaneously. In this process unstable atoms emit ionizing particles or radiations and eventually reach a stable state. Basically there are three types of nuclear decay, namely

Materials used

Six-faced dice, a large board for rolling of the dice, as shown in Figure-2, and two buckets for collecting the dice

Figure-2: The dice and a large board used for rolling the dice on it