Beta particles are composed of electrons ,
they can also be streams of positrons, they are negatively charged and less massive than
alpha particles, they are emitted when an unstable atom with excess of neutron undergo beta decay, where a neutron
is converted in proton, electron and an
electron antineutrino, but in atom with excess of protons positron decay occurs
and a neutron, positron and an electron neutrino is produced.
the composition of beta ray are
stream of fast moving electrons with a speed less than that of gamma ray but
faster than alpha particles, beta ray are more penetrating than alpha particles but less than ionizing than
alpha particles. therefore the beta particle composition could be streams of
electrons or positron depending o the type of atom they originate or decay that
produce them
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