"Alpha particles are a very slow form of radiation and can only travel a short distance. They are stopped by a sheet of paper and can travel only a few centimetres. However, this is because they have a very strong ionising effect. This means that they knock out electrons from air molecules, meaning they become positively charged."@en . "Alpha particle"@en . . . . . . . . "Gormaganders fed on alpha particles. (DIS: \"Magic to Make the Sanest Man Go Mad\") Alpha particles are real particles consisting of two protons and two neutrons."@en . "Alpha particles are a very slow form of radiation and can only travel a short distance. They are stopped by a sheet of paper and can travel only a few centimetres. However, this is because they have a very strong ionising effect. This means that they knock out electrons from air molecules, meaning they become positively charged."@en . "Gormaganders fed on alpha particles. (DIS: \"Magic to Make the Sanest Man Go Mad\") Alpha particles are real particles consisting of two protons and two neutrons."@en . . .