Ir-191 Isotope Information and Examples of Enriched Ir-191 Applications:

Iridium-191 isotope (Ir-191 isotope, 191Ir isotope)

  • Ir-191 isotope is used for Iridium-192 radionuclide (radioisotope) production (can be used as a radiation source in radiographic testing and radiotherapy);
  • Ir-191 isotope is used for Osmium-189m nuclear isomer production (can be used in life science for healthcare and medical applications and pharmaceuticals industries);
  • Ir-191 isotope is used for geological studies;

Ir-191 isotope is available to order from in Ir-191 metal chemical form. Please contact us via request a Ir-191 quote to order Ir-191 isotope to get Ir-191 price to buy Ir-191 isotope.

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Ir-191 metal Safety Data Sheet (SDS) - Download pdf file
Download Ir-191 metal SDS

Properties Of Ir-191 Isotope:

Neutron Number (N)114
Atomic Number / Proton Number (Z)77
Mass Number / Nucleon Number (A)191
Natural Abundance (%)0.373
Atomic Mass (Da)190.96059
Relative Isotopic Mass190.96059
Quadrupole Moment0.816
g-factor (g value)0.1005
Electron Configuration Blockd
Melting Point (K)2683
Boiling Point (K)4403
Specific Heat0.133
Heat of Formation669
Thermal Conductivity147
Dipole Polarizability 54
Electron Affinity (kJ/mole)1.5638
Electronegativity (Pauling scale)2.2
Atomic Radius (pm)136
Covalent Radius (pm)135
VDW Radius (pm)236
Lattice Constant3.84
Crystal StructureFCC
Jmol color#175487

Iridium Information

Very hard and brittle, silvery metallic transition element. It has a yellowish cast to it. Salts of iridium are highly colored. It is the most corrosion resistant metal known, not attacked by any acid, but is attacked by molten salts. There are two natural isotopes of iridium, and 4 radioisotopes, the most stable being Ir-192 with a half-life of 73.83 days. Ir-192 decays into Platinum, while the other radioisotopes decay into Osmium. Iridium is used in high temperature apparatus, electrical contacts, and as a hardening agent for platinumpy. Discovered in 1803 by Smithson Tennant in England. The name comes from the Greek word iris, which means rainbow. Iridium metal is generally non-toxic due to its relative unreactivity, but iridium compounds should be considered highly toxic.

Used with osmium to tip gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for platinum.

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