Decay

• When a radioisotope loses an alpha particle it's mass number decreases by 4 and its atomic number decreases by 2. This is known as alpha decay.
• Beta minus decay occurs when the nucleus emits an electron (beta-). The atom gains one unit to its atomic number but remains unchanged in terms of mass number.
• There are 3 types of radiations: Alpha,

  Beta,

  and Gamma.
• Alpha Decay: A type of radioactive decay in which an alpha particle is emitted from a nucleus.
• Gamma Decay: A type of radioactive decay in which an unstable nucleus emits a high-energy gamma ray.
• Alpha particles consist of a Helium nuclei
• Beta particles are constructed of electrons that have been ejected from the atom
• Gamma rays are electromagnetic waves that are emitted from within the nucleus of an atom
• Alpha Particles are attracted to negative charges, and can be stopped using a single sheet of paper
• Beta particles are attracted to positive charges and can be stopped with a thin sheet of Aluminium
• Gamma rays are not deflected by electrical fields. They are able to travel great distances in the air and can only be stopped using barriers made of materials such as lead or concrete