Nuclear Radiation


Henry Becquerel discovered radioactivity accidentally in 1896.


Nuclear radiation:

Some elements contain atoms with unstable nuclei. With time, the unstable nucleus disintegrates. While doing so, it shoots out a tiny particle and sometimes wave energy as well. Since the particles and the waves radiate from the nucleus, it is called nuclear radiation.


Radioactive isotopes:

These are particular isotopes of an element whose atoms have different number of neutrons in the nucleus.


List of radioactive isotopes:


Three main types of nuclear radiation:

Alpha particles (α) , Beta particles (β) and Gamma rays (γ)


Properties of alpha, beta and gamma radiation:






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