compare the velocity and momentum of Alpha Beta and Gamma particles
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When an atom undergoes radioactivity, it emits particles like alpha, beta and gamma rays. Radioactivity basically occurs because the unstable atom tries to attain stability. Hence, when they are unstable, they eventually decay by emitting a particle transforming the nucleus into another nucleus, or into a lower energy state. This chain of decays continues till the nucleus attains the stage of stability.
There are basically three types of radiations that are emitted by radioactive particles. These three are called the alpha, beta and gamma rays. All these radiations are released from the nucleus of the atom. Though all three cause some ionization and have some penetration power, but their behavior differs from the others. We discuss the properties of alpha, beta and gamma rays in detail one by one:
Properties of Alpha Rays
Alpha Decay
Alpha rays or alpha particles are the positively charged particles. A highly energetic helium nucleus which contains two protons and two neutrons is called the alpha-particle.
Alpha particles have the least penetration power but the greatest ionization power. They cannot penetrate the skin but this does not mean that they are not dangerous. Since they have a great ionization power, so if they get into the body they can cause serious damage. They have the ability of ionizing numerous atoms I a short distance. It is due to this reason that the radioactive substance that releases alpha particles needs to be handled with rubber gloves. It should not be inhaled, eaten or allowed near open cuts.
Beta Rays
Beta DecayBeta particles are highly energetic electrons which are released from inside of a nucleus. They are negatively charged and have a negligible mass. On the emission of a beta particle, a neutron in the nucleus divides into a proton and an electron. The beta particle is thus the electron that is rejected from the nucleus at high speed. Beta particles have a greater penetration power than the alpha particles and can easily travel through the skin. Though beta particles have less ionization power than the alpha particles but still they are dangerous and so their contact with the body must be avoided.
Gamma Rays
Penetrating Power of Different Rays
The waves from the high frequency end of the electromagnetic spectrum which do not have any mass are called the gamma rays. They have greatest power of penetration. They are the least ionizing but most penetrating and it is extremely difficult to stop them from entering the body. These rays carry huge amount of energy and can even travel through thin lead and thick concrete.