what type of radioactive emission is most dangerous?
the gamma radioactive decay is the least dangerous. Alpha, beta and gamma are the three main types of radioactive decay. yes, it is because of the spontaneous disintegration of the radionuclide in which it is emitting a large amount of radiation that will affect the DNA cells in the human body.
Gamma rays are the most dangerous. Externally, gamma radiation is dangerous because it can penetrate the body. Alpha is most dangerous if ingested. gamma if you're counting external damage, and alpha if you're counting internal. The type of radiation with the most penetrating capabilities is  gamma radiation. It is a form of ionizing radiation .