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Alpha radiation
Fast moving particles, helium nuclei, ejected from certain radioactive nuclei.
Beta radiation
Electrons with speeds just less than the speed of light, ejected from certain radioactive nuclei.
Gamma radiation
Photons of high energy (high frequency, short wavelength) ejected from radioactive nuclei.
XAZ notation
X is the chemical symbol of the element, A the mass number (number of protons plus number of neutrons) and Z the atomic number (number of protons).