Radiation is a physical property of matter. Under normal conditions, radiation occurs at a quantified, predictable rate. (This is why atomic clocks are so good at keeping time.) Radioactive isotopes in smoke detectors allow simple counting mechanisms to be used.
However, it is very expensive to isolate or synthesize certain radioactive isotopes, and beta and gamma radiation can be very dangerous as they ionize molecules in your body.
Relatively harmless compounds may decay into much more dangerous radioactive isotopes. This is why uranium can be handled with normal precautions but "spent" nuclear fuel is so harmful. Spent nuclear fuel contains isotopes of cesium, iodine, and plutonium that decay much faster and release beta and gamma radiation.
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Not all isotopes are radioactive; the radioactive isotopes are unstable and emit radiations.
Both isotopes and radioactive isotopes are pretty much the same but radioactive isotopes are better because it can be used to make medicine.
Sodium has no radioactive isotopes.
Radioactive isotopes are not stable.
All the uranium isotopes are radioactive.
All radioactive isotopes will disintegrate.
All isotopes of francium are radioactive.
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Some examples are deuterium and tritium which are radioactive isotopes of hydrogen.
There are no radioactive isotopes of boron that are ordinarily found in nature. All elements have synthetic radioactive isotopes, however.
No radioactive isotopes of neon are ordinarily found in nature. All elements have radioactive synthetic isotopes, however.