  The precision measurement of the $\beta-$spectrum shape for $^{210}$Bi
(historically RaE) have been performed with a spectrometer based on
semiconductor Si(Li) detector. This first forbidden non-unique transition has
the transition form-factor strongly deviated from unity and knowledge of its
spectrum would play an important role in low-background physics in presence of
$^{210}$Pb background. The measured transition form-factor could be
approximated as $S(W) = 1 + (-0.4363 \pm 0.0037) W + (0.0523 \pm 0.0010) W^2$,
that is in good agreement with previous studies and has significantly increased
parameter precision.
