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Yes, alpha decay occurs naturally, that is why radioactive material is dangerous, because we can't simply "turn off" the radioactive decay.
maybe
It is radon that we see formed from the decay of naturally radioactive substances in the earth's crust.
Radioactive Decay occurs naturally all around us. If you test for radiation with a Geiger Counter, you will find that it picks up radiation in the air around you. Mostly, however, radioactive decay occurs in the earth's crust. I cannot name a specific element, as there are many that decay.
Yes. Radium is a natural decay product of uranium, which is naturally formed in stellar nuclear fusion.
It is radioactive decay.
yes because it is naturally replenished with the decay of material
There are over twenty known isotopes of argon. Of these all but three are radioactive and decay. Of naturally occurring argon, very nearly 100% is not radioactive, with only traces of one radioactive isotope found.
No, Carbon-14 naturally decays into nitrogen-14 through beta decay, not into Carbon-12. Carbon-12 is a stable isotope and does not undergo radioactive decay.
Effectively any organic being is recycled naturally it is called decay.
Radium naturally decays into radon, which is a radioactive noble gas. This decay process is one of the steps in the radioactive decay chain of uranium-238.
Yes. Naturally occurring radioactive isotopes decay naturally. They can be induced to decay more rapidly through neutron capture, but they will decay one way or the other. Among the commonly encountered, or commonly mentioned isotopes that do this are radon-222, which comes as a gas from many kinds of rocks and is found in the basements of some buildings, carbon-14, which is used for carbon dating, and potassiom-40, which is found in all living tissue.