Radio-Activity was created in 1975-10.
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Uranium becomes lead
You can only say, 23 years later, I-131's radioactivity almost decreases to 1/8 of original radioactivity.
Radioactivity is caused by unstable atoms, that break apart.
After 6 hours 50 % of Tc-99m is disintegrated.
Pioneer in the discovery of radioactivity.
"Artificial transmutation" is a nuclear reaction induced in laboratory, its man made. Artificial radioactivity is a radioactive disintegration phenomenon supported by artificial isotopes.
Radioactivity affect the water molecules. Radioactivity makes it harmful
Radioactivity was not created, it occurs naturally when there are too many protons in a nucleus of an atom. They are charged positively and since they are the same charge they repel each other. When the nucleus bursts radioactivity occurs. Radioactivity was first observed by Whilem Roentgen, who did not understand them, therefore he named them x-rays, x standing for unknown. Later on Henri Bequerel discovered that uranium gave off "x-rays". But it was Marie Curie who first understood these "x-rays" and coined the term radioactive to describe them.
What other sort of radioactivity is there?
For example natural and artificial radioactivity.
Energy coming to the earth and radioactivity are not same. Energy comes mostly from the sun and other parts of space. The energy of radioactivity is already bound up inside of the atom.
Radioactivity can be induced in ordinary matter by artificial transmutation.
You cannot measure radioactivity in litres
Radioactivity in Japan is about 15,000 terabecquerels.
Human + A lot of radioactivity = Dead
Artifical radioactivity