Iridium-193m2

Properties and data of the isotope ^193m2Ir.

Contents

See also: List of individual Iridium isotopes (and general data sources).

General data

Name of the isotope:Iridium-193m2; Ir-193m2Symbol:^193m2Ir or 193m277IrMass number A:193 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:116Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5064935064935 (= neutron-proton ratio)Neutron excess (N-Z):39Excitation energy:2278.9(5) keVIsotopic mass:192.96292(2) u (atomic weight of Iridium-193m2)Nuclide mass:192.9206838 u (calculated nuclear mass without electrons)Mass excess:-34.5398 MeVMass defect:1.64473772 u (per nucleus)Nuclear binding energy:1532.06331775 MeV (per nucleus)
7.93815191 MeV (average binding energy per nucleon)Half-life:124.8(21) μsDecay constant λ:5554.0639467944 s^-1Specific activity α:1.742049762119 × 10⁺²⁵ Bq g^-1
4.708242600322 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)31/2+

Radioactive Decay

Half-life T_½ = 124.8(21) μs respectively 1.248 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹³Ir	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁹³Ir		stable	3/2+
^193mIr	80.239(6) keV	10.53(4) d	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 116) and isobaric (same nucleon number A = 193) with Iridium-193m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 116	Isobar A = 193
71	¹⁸⁷Lu
72	¹⁸⁸Hf
73	¹⁸⁹Ta	¹⁹³Ta
74	¹⁹⁰W	¹⁹³W
75	¹⁹¹Re	¹⁹³Re
76	¹⁹²Os	¹⁹³Os
77	¹⁹³Ir	¹⁹³Ir
78	¹⁹⁴Pt	¹⁹³Pt
79	¹⁹⁵Au	¹⁹³Au
80	¹⁹⁶Hg	¹⁹³Hg
81	¹⁹⁷Tl	¹⁹³Tl
82	¹⁹⁸Pb	¹⁹³Pb
83	¹⁹⁹Bi	¹⁹³Bi
84	²⁰⁰Po	¹⁹³Po
85	²⁰¹At	¹⁹³At
86	²⁰²Rn	¹⁹³Rn
87	²⁰³Fr
88	²⁰⁴Ra
89	²⁰⁵Ac