Alpha Particle: made of 2 protons & 2 neutrons, the electric charge is 2+, the same as nucleus of He, have the same mass as 4 protons, the speed is about 0.3 ✕ 108 m/s, absorbed by a sheet of paper, has strong ionisation ability, deflected to negatively charged, deflected to south pole of magnet, , has weak penetrating power, have high kinetic energy, absorbed by 5 cm of air, Beta Particle: , made of an electron, the electric charge is 1-, the same as electron, the mass is equal to 1/1840 proton, the speed is about 2.9 ✕ 108 m/s, absorbed by 5 mm of aluminium sheet, has medium penetrating power, has medium ionisation ability, has moderate kinetic energy, deflected to positive charge, deflected to north pole of magnet, Gamma Ray: , made of electromagnetic radiation, uncharged, similar to X-ray, has no mass, has speed of 3 ✕ 108 m/s, absorbed by meters of concrete, absorbed by centimeters of lead, has strong penetrating power, has weak ionisation ability, not deflected in magnetic field, not deflected in electric field, has low kinetic energy,

Radioactivity Decay

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