Which type of radiation is defined as being positively charged?

Alpha radiation is defined as being positively charged because it consists of alpha particles, which are made up of two protons and two neutrons. This emission occurs during certain types of radioactive decay. The presence of the two protons means that alpha particles carry a positive charge.

In comparison, beta radiation involves the emission of beta particles, which can be either negatively charged (beta-minus) or positively charged (beta-plus). Gamma radiation consists of high-energy photons and carries no charge, while neutron radiation consists of uncharged neutrons. Since the question specifically asks for the type of radiation that is positively charged, alpha radiation is the appropriate answer.