Beta Radiation:

The beta particle is more penetrating than the alpha. Therefore, since of the -1 charge, the beta particle interacts more readily than a non-charged particle.  For this purpose, it is less penetrating than uncharged categories of radiation such as the neutron or gamma.  The beta particle could commonly be stopped through a sheet of aluminum. Since the beta travels farther than the alpha, it deposits its energy over a greater area and is, thus, less harmful than the alpha if taken internally. All materials elaborate under neutron and gamma radiation are also effectual at attenuating beta radiation.

Because alpha and beta particles could be simply shielded against, they do not present a main problem in the nuclear reactor plant.