Definition of beta ray
1
: beta particle
2
: a stream of beta particles
— called also beta radiation
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“Beta ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/beta%20ray. Accessed 29 Jun. 2022.
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Time Traveler for beta ray
The first known use of beta ray was in 1902
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