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Np. Trace quantities are found in nature from neutron capture reactions by uranium atoms, a fact not discovered until 1951. [2] Twenty-five neptunium radioisotopes have been characterized, with the most stable being 237 Np with a half-life of 2.14 million years, 236 Np with a half-life of 154,000 years, and 235 Np with a half-life of 396.1 days.
This page lists radioactive nuclides by their half-life.
Y being the longest at 106 days), yttrium extracted from strontium-free moderately aged spent fuel has negligible radioactivity. However, the strong gamma emitter 90 Y will be present as long as its parent nuclide 90 Sr is. Should a nonradioactive sample of Yttrium be desired, care must be taken to remove all traces of strontium and sufficient ...
A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.
Glovebox. Radiochemistry is the chemistry of radioactive materials, where radioactive isotopes of elements are used to study the properties and chemical reactions of non-radioactive isotopes (often within radiochemistry the absence of radioactivity leads to a substance being described as being inactive as the isotopes are stable).
A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e. extremely small). Generally speaking, trace radioisotopes have half-lives that are short in comparison with the age of the Earth, since primordial nuclides tend to occur in larger than trace amounts. Trace radioisotopes are therefore present only because they ...
A wide variety of neptunium sulfide compounds have been characterized, including the pure sulfide compounds NpS, NpS 3, Np 2 S 5, Np 3 S 5, Np 2 S 3, and Np 3 S 4. Of these, Np 2 S 3 , prepared by reacting NpO 2 with hydrogen sulfide and carbon disulfide at around 1000 °C, is the most well-studied and three allotropic forms are known.
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