Iridium-191 Isotope Applications:

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

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

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

back to Iridium isotopes list

Iridium-191 Safety Data Sheet (SDS) in metal form - Download pdf file
Download Iridium-191 SDS in metal form

Properties of Iridium-191 Isotope:

Properties of Iridium-191 Isotope:IRIDIUM-191
Natural Abundance (%)37.3
Atomic Mass (Da)190.960594
Relative Isotopic Mass190.960594
Neutron Number (N)114
Atomic Number (Z)77
Mass Number (A)191
Nucleon Number (A)191
Proton Number (Z)77
Quadrupole Moment0.816
g-factor (g value)0.1005
Electron Configuration Blockd
Melting Point (K)2719
Boiling Point (K)4403
Specific Heat0.133
Heat of Formation669
Thermal Conductivity147
Dipole Polarizability 54
Electron Affinity (kJ/mole)1.56436
Electronegativity (Pauling scale)2.2
Atomic Radius (pm)135.5b
Covalent Radius (pm)135
VDW Radius (pm)236
Lattice Constant3.84
Crystal StructureFCC
Jmol color#175487

Iridium-191 Information

Iridium is a 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 2 natural stable isotopes of iridium. Totally iridium has 39 isotopes. The most stable being Ir-192 with a half-life of 73.83 days. Ir-192 decays into Platinum, while some radioisotopes decay into Osmium. Iridium is used in high temperature apparatus, electrical contacts. Iridium was discovered by Smithson Tennant in England in 1803. The name Iridium 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.

Iridium is used with osmium to tip gold pen points, to make crucible and special containers. It is used also to make alloys applied for standard weights and measures, and heat-resistant alloys. Iridium is used as hardening agent for platinum too.

back to Iridium isotopes list

FAQ about Iridium-191 Isotope:

What is Iridium-191 isotope natural abundance?
Answer: 37.300 %

What is atomic mass for Iridium-191 isotope?
Answer: 190.96059 Da

What is isotopic mass for Iridium-191 isotope?
Answer: 190.96059

How many neutrons does Iridium-191 isotope have?
Answer: 114

How many protons does Iridium-191 isotope have?
Answer: 77

How many electrons does Iridium-191 isotope have?
Answer: 77

What is atomic number for Iridium-191 isotope?
Answer: 77

Is Iridium-191 isotope stable?
Answer: Yes

Is Iridium-191 isotope radioactive?
Answer: No

back to Iridium isotopes list