Definition of Beta rays
Be´ta rays
1.
(Physics)
a
form
of
ionizing
radiation
emitted
by
radioactive
substances
(
such
as
radium
),
more
penetrating
than
alpha
rays
,
and
consisting
of
negatively
charged
electrons
.
The
electrons
are
the
same
kind
of
particle
as
those
of
cathode
rays
,
but
have
much
higher
velocities
(
about
35
,
000
to
180
,
000
miles
per
second
).
They
are
readily
deflected
by
a
magnetic
or
electric
field
.
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