ذرهی ِ بتا
zarre-ye betâ (#)
Fr.: particule bêta
An → electron or a → positron emitted
from an unstable nucleus during a → radioactive
process known as → beta decay.
The term "beta particle" relates to the early history of the
→ radioactivity studies when the nature of the emergent
particles was not elucidated; → particle.