What kind of radioactive radiation is the most dangerous in case of internal human exposure?

There are three types of radioactive radiation: alpha, beta, gamma. Alpha radiation has the highest energy, but the lowest penetrating power. The easiest way to protect yourself from it. Even a person’s clothing is already an obstacle to this radiation. Beta radiation has less energy than alpha radiation, but more penetrating power. Gamma radiation has the highest penetrating ability, in comparison with the rest, therefore, with internal human irradiation, it is the most dangerous.