The nuclei of radioactive substances are unstable. They bcome stable by radioactive decay. In this process, they emit radiation and turn into other elements.
The three types of radiation emitted are:alpha radiation; beta radiation; gamma radiation.
A radiaoactive substance contains unstable nucleithat becomes stable by emitting radiation.
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Radioactive Decay
Unstable nuclei become stable by radioactive decay. In this process, they emit radiation and turn into other elements.
We cannot predict when an unstable nucleus will decay. It is a random process and is not affected by external conditions.
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Background Radiation
Background radiationis around us all the time. This is radiation from radioactive substances in the enviroment, from space, from devices such as X-ray tubes.
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