Hydrogen is an excellent absorber of neutrons and gamma radiation. In water, it is *very* common as a shielding material. Cobalt-59 is used as a neutron absorber for some nuclear reactors (control rods), and makes a radioactive material useful in industry and medicine (Co-60). Zirconium can accept many neutrons before becoming radioactive itself. It is commonly used to package materials used in the nuclear industry. Uranium-238 is an excellent shield for gamma radiation sources, requiring less total mass than an equivalent amount of lead. Or you could just use Lead to stop radiation, which is probably the boring answer you were looking for. Note that no element is a "shield from radioactive substances", just for line-of-sight radiation from them. Radiation from plutonium-239 is most dangerous when it has been inhaled into your lungs. Lead won't help here. Radiation from Strontium-90 damages your bone marrow when ingested with food. Lead won't help here either.
Lead mainly, in some cases (ironically) depleted uranium, a few others do the job but those are the main two you'll find
Lead, Pb, will stop almost all types of radiation.
lead
uranium-238 known as depleted uranium as well
Usually lead. It's the most stable, and densest material known to prevent radiation escaping.
lead
You think probable to lead bricks.
* Alpha radiation can be stopped by a sheet of card * Beta radiation can be stopped be a few inches of aluminium * Gamma radiation can be stopped by several inches of lead or many feet of concrete.
radioactive decay
alpha particle, He nucleus
Depends...
Lead
Lead
Actimium, plutonium, radon, radium, thorium, uranium
It is radon that we see formed from the decay of naturally radioactive substances in the earth's crust.
You think probable to lead bricks.
As radioactive element is an element that is on the Priodic Table of Elements. A Radioactive Element is usually radioactive.
non radioactive element
Its Lead. thick lead shields or badges are used to block radiations.
Radioactive substances are the things that put off radiation. These could be radioactive waste, or even radioactive materials not yet used.
A radioactive element is one that discharges radiation. Uranium is a radioactive element. A radioactive element is very dangerous if you don't have protective clothing. You should never go near a radioactive element.
* Alpha radiation can be stopped by a sheet of card * Beta radiation can be stopped be a few inches of aluminium * Gamma radiation can be stopped by several inches of lead or many feet of concrete.
well its is sometimes but barely, which is why most radioactive substances eventually settle on lead as their final element, crazy stuff.