LEARNit Dictionary
alpha particle
noun
/ˈælfə pɑːtɪkl/
UK
/ˈælfə pɑːrtɪkl/
US
1
a particle with a positive electrical charge that is emitted(= sent out) by some radioactive substances and is identical to (= the same as) the nucleus of a heliumatom
ذره آلفا, هسته اتم هلیوم, ذره هلیومی