Which type of natural radiation can penetrate about 1 cm of human flesh and requires wood or aluminum as minimum protective shielding?

Question

Quizplus · Accepted Answer

Beta radiation can penetrate about 1 cm of human flesh and requires materials like wood or aluminum for shielding. Alpha particles are stopped by a sheet of paper, and gamma rays require much denser materials for shielding, such as lead or several centimeters of concrete.

Which Type of Natural Radiation Can Penetrate About 1 Cm