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Betelgeuse
beth
Beth Din
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betatron

be·ta·tron [ báytə tròn, btə tròn ] (plural be·ta·trons)


noun 
Definition:
 
electron accelerator: a device that accelerates electrons in a circular orbit by means of a rapidly alternating magnetic field. In this way, electrons can reach energies of 340 MeV and may be used to strike a metal target to produce a continuous stream of gamma rays.

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