Which type of radiation is known to penetrate human tissue the deepest?

Gamma rays are a form of electromagnetic radiation and are known for their high penetration power. Because of their very short wavelengths and high energy, gamma rays can penetrate through human tissue more effectively than alpha and beta particles, which are charged and interact with matter differently.

Alpha particles, being positively charged, have a very low penetration ability and can be stopped by just a sheet of paper or the outer layer of skin. Beta particles, although more penetrating than alpha particles, are still less penetrating than gamma rays and can be stopped by materials like plastic or glass.

X-rays, while also penetrating and capable of passing through soft tissue, generally have lower energy and penetration capabilities compared to gamma rays. Thus, when considering which type of radiation can penetrate the deepest, gamma rays are the clear choice due to their high energy, which allows them to travel further into the human body without being absorbed or scattered as much compared to other forms of radiation.