Many elements have both natural and artificial isotopes ( e . g . hydrogen has three natural isotopes and another four known artificial isotopes ).
12.
Tritium is a natural isotope of hydrogen, but because it has a short half-life of 12.32 years, it is hard to find, store, produce, and is expensive.
13.
Nuclear weapons and energy are absolutely missing . " In the early history of the study of radioactivity, the different natural isotopes of thorium were given different names.
14.
Thus, by comparing the specific natural isotope fractionation corresponding to each site of a molecule of ethanol of wine with that of a molecule known and referenced in a database.
15.
Scientists are experimenting with other identification options : using the natural isotopes that young fish pick up from the rocks around their home tributary, and using a fish's DNA mark.
16.
Of these natural isotopes, 90 Zr is the most common, making up 51.45 % of all zirconium . 96 Zr is the least common, comprising only 2.80 % of zirconium.
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Some artificial radioisotopes such as iodine-131 are chemically identical to natural isotopes needed by the body, and may be more readily absorbed if the individual has a deficit of that element.
18.
A further distinction among stable natural isotopes is division into primordial ( existed when the Solar System formed ) and cosmogenic elements ( created by cosmic ray bombardment or other similar processes ).
19.
Thorium-232 ( 232 Th ), which has 142 neutrons, is the most stable isotope of thorium and accounts for nearly all natural thorium, with six other natural isotopes occurring only as trace radioisotopes.
20.
Rubidium-82, one of the element's non-natural isotopes, is produced by electron-capture decay of strontium-82 with a half-life of 25.36 days . With a half-life of 76 seconds, rubidium-82 decays by positron emission to stable krypton-82.
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