Such 'salted' weapons have never been built or tested, as far as is publicly known, and certainly never used as weapons.Tantalum can be used as a target material for accelerated proton beams for the production of various short-lived isotopes including 8Li, 80Rb, and 160Yb. This would transmute the tantalum into the radioactive isotope 182Ta, which has a of 114.4 days and produces with approximately 1.12 million electron-volts (MeV) of energy apiece, which would significantly increase the radioactivity of the from the explosion for several months. An external shell of 181Ta would be irradiated by the intensive high-energy neutron flux from a hypothetical exploding nuclear weapon. It is also the rarest isotope in the Universe, taking into account the elemental abundance of tantalum and isotopic abundance of 180mTa in the natural mixture of isotopes (and again excluding radiogenic and cosmogenic short-lived nuclides).Tantalum has been examined theoretically as a ' material for ( is the better-known hypothetical salting material).
Early investigators had only been able to produce impure tantalum, and the first relatively pure ductile metal was produced by in in 1903. De Marignac was the first to produce the metallic form of tantalum in 1864, when he tantalum chloride by heating it in an atmosphere of. These discoveries did not stop scientists from publishing articles about the so-called until 1871. Further confirmation came from the Swiss chemist, in 1866, who proved that there were only two elements. The supposed element 'pelopium' was later identified as a mixture of tantalum and niobium, and it was found that the niobium was identical to the columbium already discovered in 1801 by Hatchett.The differences between tantalum and niobium were demonstrated unequivocally in 1864 by, and, as well as by, who determined the empirical formulas of some of their compounds in 1865.
This conclusion was disputed in 1846 by the German chemist, who argued that there were two additional elements in the tantalite sample, and he named them after the children of: niobium (from, the goddess of tears), and pelopium (from ).
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