The penetrating power of alpha rays, beta rays, and gamma rays varies greatly. Alpha particles can be blocked by a few pieces of paper. Beta particles pass through paper but are stopped by aluminum foil. Gamma rays are the most difficult to stop and require concrete, lead, or other heavy shielding to block them.
Then, which radioactive particle has the most penetrating power?
Occurs when an unstable nucleus emits a particle composed of two protons and two neutrons. Thus the symbol for alpha radiation is the symbol for helium-4. Most massive of all particles emitted by radioactive nuclei. Alpha radiation has the highest ionizing power and the lowest penetrating power.
Which Ray has most penetrating power?
A sheet of paper is all that is needed for the absorption of alpha rays. However, it may take a material with a greater thickness and density to stop beta particles. Gamma rays have the most penetrating powers of all three radiation sources.
Why do Gamma rays have the greatest penetrating power?
Gamma rays are the most penetrating of the radiations. Gamma rays are highly energetic waves and are poor at ionising other atoms or molecules. It cannot be said that a particular thickness of a material can absorb all gamma radiation.