Lanthanum-139 Isotope Information and Examples of Enriched Lanthanum-139 Applications:

Lanthanum-139 isotope (La-139 isotope, 139La isotope)

  • Lanthanum-139 isotope is used for Cerium-139 radionuclide (radioisotope) production (can be used in life science for healthcare and medical applications and pharmaceuticals industries);
  • Lanthanum-139 isotope is used for research in nuclear physics;

Lanthanum-139 isotope is available to order from in Lanthanum-139 oxide chemical form. Please contact us via request a Lanthanum-139 quote to order Lanthanum-139 isotope to get Lanthanum-139 price to buy Lanthanum-139 isotope.

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Properties Of Lanthanum-139 Isotope:

Neutron Number (N)82
Atomic Number / Proton Number (Z)57
Mass Number / Nucleon Number (A)139
Natural Abundance (%)0.9991119
Atomic Mass (Da)138.90636
Relative Isotopic Mass138.90636
Quadrupole Moment0.2
g-factor (g value)0.795156
Electron Configuration Blockd
Melting Point (K)1194
Boiling Point (K)3730
Specific Heat0.197
Heat of Formation431
Thermal Conductivity13.4
Dipole Polarizability 215
Electron Affinity (kJ/mole)0.47
Electronegativity (Pauling scale)1.1
Atomic Radius (pm)187
Covalent Radius (pm)195
VDW Radius (pm)278
Lattice Constant3.75
Crystal StructureHEX
Jmol color#70d4ff

Lanthanum Information

(From the Greek word lanthanein, to line hidden) Silvery metallic element belonging to group 3 of the periodic table and oft considered to be one of the lanthanoids. Found in some rare-earth minerals. Twenty-five natural isotopes exist. La-139 which is stable, and La-138 which has a half-life of 10^10 to 10^15 years. The other twenty-three isotopes are radioactive. It resembles the lanthanoids chemically. Lanthanum has a low to moderate level of toxicity, and should be handled with care. Discovered in 1839 by C.G. Mosander.

It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses.

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