Usually lead (Pb) because it is a cheap heavy metal.
Lead
The most used is lead.
ima boss all day
If you mean HALF LIFE, that is the length of time it takes a quantity of a radioactive element to lose half its radioactivity.
The protective apron used by dentists contains lead, which is highly opaque to radioactivity. (You would also notice that if you read Superman comic books; lead is used to safely contain kryptonite.)
Lead
Lead
You can say that as long as the alpha particle itself is not originating from a radioactive element. If however one is able to isolate the helium nucleus from the elemental atom and then used for bombarding towards the beryllium then it is considered as an example of artificial radioactivity. Or the production of a radioactive element(synthetic element) like Francium can be considered artificial radioactivity.
Plutonium is the radioactive element named after the god of the underworld, Pluto. It is used in nuclear reactors and weapons due to its high radioactivity.
No, Francium is not used in bombs. Due to its high radioactivity and scarcity in nature, Francium is not a practical element to use in weapon applications.
Americium is a synthetic element that typically uses plutonium as the starting material for its production. It is commonly used in smoke detectors and in some medical devices for imaging purposes due to its radioactivity.
A geiger counter is used to locate radioactivity in the environment.