Which type of natural radiation cannot penetrate human skin and requires only heavy paper or clothing as minimum protective shielding?

Question

Quizplus · Accepted Answer

Alpha particles have very low penetrating power and can be shielded by a piece of heavy paper or clothing. Beta particles have more penetrating power than alpha and require thicker shielding, while gamma rays have the highest penetrating power and require concrete or lead shielding.

Which Type of Natural Radiation Cannot Penetrate Human Skin and Requires