In essence, the effect of beta radiation (electron) on the immune system is described here: Article Low-Energy Laser-Driven Ultrashort Pulsed Electron Beam Irra...
Alpha particles pose no direct or external radiation threat; however, they can pose a serious health threat if ingested or inhaled., beta particles. Some beta particles are capable of penetrating the skin and causing damage such as skin burns. Beta-emitters are most hazardous when they are inhaled or swallowed.