Which element is used as a shield to protect people from radioactive substances

its science

Lead is most commonly used for protecting people from radioactive substances.

For example, if you go to the dentist and they give you an X-ray of your teeth, they will usually give you a lead bib to protect you from the radiation produced by the X-ray. However, carbon (graphite usually) can also be used to shield, but whereas a plate of lead may work it would take a brick of graphite.