Gamma ray becomes electron/positron pair

Gamma ray becomes electron/positron pair

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Credit: I. CURIE & F. JOLIOT/SCIENCE PHOTO LIBRARY

Caption: Cloud chamber photograph showing the conversion of a gamma ray into an electron-positron pair. Gamma rays do not leave tracks in a cloud chamber because they have no electric charge. But if they have enough energy, they can reveal themselves by converting into matter & antimatter, as in this case. Because they have opposite electric charge, the electron & positron curl away in opposite directions in the cloud chamber's magnetic field. Gamma rays are a very energetic form of light (electromagnetic radiation). They are also one of the 3 types of radiation emitted by radioactive materials. The photo was taken by French physicists Irene Curie & Frederic Joliot.

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Keywords: cloud chamber image, cloud chamber imagery, curie, electron-positron pair, frederic's photograph, gamma ray, irene's photograph, joliot, odyssey, particle physics, particles, photo, radioactivity, subatomic track, tracks

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