How are radioactive rays emitted?
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At the center of every atom is the nucleus, the nucleus contains positively charged protons and neutrally charged neutron particles. They are united with each other in the nucleus. This nucleus is actually responsible for the radioactivity of an element. As a result of the fission of the nucleus, one element is transformed into another new element and emits radioactive rays of different powers in different fields. The rays are – alpha, beta and gamma rays. These rays are actually not ordinary light rays. They are atomic particles. An alpha particle is like a helium nucleus, containing two protons and two neutrons. A beta particle is an electron. But gamma rays are electromagnetic waves like visible light. But it is more powerful and penetrating than visible light. Since radioactivity is a nuclear phenomenon, its activity cannot be inhibited or reduced by any external normal physical process like pressure, heat, electricity or magnetic field.