What type of radiation is the most dangerous because it can only be stopped by a thick dense metal such as lead?

Gamma radiation is considered the most dangerous type of radiation because it has high energy and can penetrate most materials. It requires dense materials, such as thick lead or several centimeters of concrete, to effectively shield against it. This penetrating ability makes gamma rays particularly hazardous to human health, as they can pass through the body and damage internal tissues and organs.