Iridium-192m2

Properties and data of the isotope ^192m2Ir.

Contents

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

General data

Name of the isotope:Iridium-192m2; Ir-192m2Symbol:^192m2Ir or 192m277IrMass number A:192 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:115Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4935064935065 (= neutron-proton ratio)Neutron excess (N-Z):38Excitation energy:168.14(12) keVIsotopic mass:191.9626025(14) u (atomic weight of Iridium-192m2)Nuclide mass:191.9203663 u (calculated nuclear mass without electrons)Mass excess:-34.83555 MeVMass defect:1.636390304 u (per nucleus)Nuclear binding energy:1524.28774983 MeV (per nucleus)
7.9389987 MeV (average binding energy per nucleon)Half-life:241(9) aDecay constant λ:9.120357638946 × 10^-11 s^-1Specific activity α:287560619867.73 Bq g^-1
7.7719086450738 Ci g^-1Spin and parity:
(nuclear angular momentum)(11-)

Radioactive Decay

Half-life T_½ = 241(9) a respectively 7.6 × 10⁹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹²Ir	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
¹⁹²Ir		73.829(11) d	4+
^192m1Ir	56.720(5) keV	1.45(5) min	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 192) with Iridium-192m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 115	Isobar A = 192
70	¹⁸⁵Yb
71	¹⁸⁶Lu
72	¹⁸⁷Hf
73	¹⁸⁸Ta	¹⁹²Ta
74	¹⁸⁹W	¹⁹²W
75	¹⁹⁰Re	¹⁹²Re
76	¹⁹¹Os	¹⁹²Os
77	¹⁹²Ir	¹⁹²Ir
78	¹⁹³Pt	¹⁹²Pt
79	¹⁹⁴Au	¹⁹²Au
80	¹⁹⁵Hg	¹⁹²Hg
81	¹⁹⁶Tl	¹⁹²Tl
82	¹⁹⁷Pb	¹⁹²Pb
83	¹⁹⁸Bi	¹⁹²Bi
84	¹⁹⁹Po	¹⁹²Po
85	²⁰⁰At	¹⁹²At
86	²⁰¹Rn
87	²⁰²Fr
88	²⁰³Ra
89	²⁰⁴Ac