xenon, neodymium, samarium, osmium, and uranium each have two primordial radioisotopes (113 Cd , 116 Cd ; 128 Te , 130 Te ; 124 Xe , 136 Xe ; 144 Nd ...

A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess numbers of either neutrons or protons, giving it...

with the age of the Earth, since primordial nuclides tend to occur in larger than trace amounts. Trace radioisotopes are therefore present only because...

(209Bi) is an isotope of bismuth, with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay). It has 83 protons and a magic number...

observationally stable isotopes: 204Pb, 206Pb, 207Pb, 208Pb. Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide. The three isotopes lead-206,...

isotope found in nature is actually one (or two) extremely long-lived radioisotope(s) of the element, despite these elements having one or more stable isotopes...

the future be found radioactive), and one very long-lived radioisotope (96Zr), a primordial nuclide that decays via double beta decay with an observed...

known as primordial radionuclides. Well-known examples are uranium and thorium, but also included are naturally occurring long-lived radioisotopes, such...

the addition of the 35 long-lived radioisotopes with half-lives longer than 100 million years, a total of 286 primordial nuclides, as noted above. The nuclides...

said to be primordial. It will then contribute in that way to the natural isotopic composition of a chemical element. Primordial radioisotopes are easily...

isotopes. All known stable isotopes occur naturally (see primordial nuclide). The many radioisotopes that are not found in nature have been characterized...

Indium (49In) consists of two primordial nuclides, with the most common (~ 95.7%) nuclide (115In) being measurably though weakly radioactive. Its spin-forbidden...

radioisotopes-research/radioisotopes-in-medicine.aspx and https://world-nuclear.org/information-library/non-power-nuclear-applications/radioisotopes...

early nuclear tests and nuclear fission accidents. All other iodine radioisotopes have half-lives less than 60 days, and four of these are used as tracers...

one very long-lived radioisotope, 174Hf, with a half-life of 7.0×1016 years. In addition, there are 34 known synthetic radioisotopes, the most stable of...

A ≤ 209 are primordial nuclides except 146Sm.) Working out the details of the theory leads to an equation relating the half-life of a radioisotope to the decay...

but at least partly from trends of neighboring nuclides (TNN). Primordial radioisotope Believed to undergo β+β+ decay to 132Xe with a half-life over 3×1020...

Non-mononuclidic elements are marked with an asterisk, and the long-lived primordial radioisotope given. In two cases (indium and rhenium), the most abundant naturally...

over 1×1014 years Used to produce the medically useful radioisotope technetium-99m Primordial radionuclide Molybdenum-99 is produced commercially by intense...

only 6000 years but is made by cosmic rays colliding with 14N). Some radioisotopes occur in nature with a half-life of less than 7×107 years (carbon-14:...

radioactive) and 8.2×1020 (820 quintillion) years. The longest-lived artificial radioisotope of tellurium is 121Te with a half-life of about 19 days. Several nuclear...

to the presence of a significant fraction of a very long-lived (primordial) radioisotope. These elements are vanadium, rubidium, indium, lanthanum, europium...

not usually decay directly to stable isotopes, but rather into another radioisotope. The isotope produced by this radioactive emission then decays into another...

slightly radioactive with an extremely long half-life, plus traces of radioisotopes that are produced by cosmic rays in the atmosphere. mKr – Excited nuclear...

kilogram of natural europium. Besides the natural radioisotope 151Eu, 36 artificial radioisotopes have been characterized, with the most stable being...

abundance) and one long-lived radioisotope, 176Lu with a half-life of 37 billion years (2.59% natural abundance). Forty radioisotopes have been characterized...

also be primordial but such claims are disputed Plutonium-238 has a half-life of 87.74 years and emits alpha particles. Pure 238Pu for radioisotope thermoelectric...

decayed to virtually zero abundance and is no longer detectable as a primordial nuclide. Extinct radionuclides were generated by various processes in...

interstellar space and it has the longest half-life of any non-primordial radioisotope. The main decay modes of isotopes with mass numbers lower than...

half-life for any positron-emitter nuclide. The long half-life of this primordial radioisotope is caused by a highly spin-forbidden transition: 40 K has a nuclear...