Alpha particle tracks from radioactive source

Alpha particle tracks from radioactive source

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Caption: Cloud chamber photograph of the tracks of alpha particles emitted from a source of the radioactive material thorium C' (polonium-212). Radioactive materials emit alpha particles at one or more specific energies. Most of the alphas in this photograph have the same energy & therefore travel the same distance (8. 6 cm) in the air inside the cloud chamber. A single alpha is emitted with higher energy & travels 11. 5 cm. Alpha particles are nuclei of helium atoms & they are one of the three forms of "radiation" - along with beta & gamma rays - emitted by radioactive materials. The photo was taken by English physicist N. Feather in the 1920s.

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Keywords: alpha particle, alpha ray, cloud chamber image, cloud chamber imagery, odyssey, particle physics, particles, photo, radioactivity, subatomic track, tracks

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