An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?
some shielding required
no mass
large mass
high penetrating power

The radiation emitted is a beta particle with a -1 charge. Beta particles have a medium penetrating power. An emission of beta particles requires shielding because of the hazards it pose to humans. Thus, one characteristic of this radiation is that some shielding is required.