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Some Types of radioisotopes are Radioactive sodium carbon,phosphorous, Iodine, Gold.Nuclei which do not emit radiations naturally are called stable nuclei.The unstable nuclide is called the parent nuclide; the nuclide that results from the decay is known as the daughter nuclide.The daughter nuclide may be stable, or it may decay itself.Beta (β) decay is the emission of an electron from a nucleus.Iodine-131 is an example of a nuclide that undergoes β decay: Beta decay, which can be thought of as the conversion of a neutron into a proton and a β particle, is observed in nuclides with a large n:p ratio.Following the somewhat serendipitous discovery of radioactivity by Becquerel, many prominent scientists began to investigate this new, intriguing phenomenon.

Click here to learn about cloud chambers and to view an interesting Cloud Chamber Demonstration from the Jefferson Lab.

We classify different types of radioactive decay by the radiation produced. Alpha particles, which are attracted to the negative plate and deflected by a relatively small amount, must be positively charged and relatively massive.

Beta particles, which are attracted to the positive plate and deflected a relatively large amount, must be negatively charged and relatively light.

Cobalt-60 emits γ radiation and is used in many applications including cancer treatment: Positron emission is observed for nuclides in which the n:p ratio is low. Positron decay is the conversion of a proton into a neutron with the emission of a positron.

The n:p ratio increases, and the daughter nuclide lies closer to the band of stability than did the parent nuclide.

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Gamma emission (γ emission) is observed when a nuclide is formed in an excited state and then decays to its ground state with the emission of a γ ray, a quantum of high-energy electromagnetic radiation.