Iridium-192m1

Properties and data of the isotope ^192m1Ir.

Contents

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

General data

Name of the isotope:Iridium-192m1; Ir-192m1Symbol:^192m1Ir or 192m177IrMass 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:56.720(5) keVIsotopic mass:191.9626025(14) u (atomic weight of Iridium-192m1)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:1.45(5) minDecay constant λ:0.0079672089719534 s^-1Specific activity α:2.512023805741 × 10⁺¹⁹ Bq g^-1
678925352.903 Ci g^-1Spin and parity:
(nuclear angular momentum)1-

Radioactive Decay

Half-life T_½ = 1.45(5) min (minutes) respectively 8.7 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹²Pt	0.0175 %
Iso	¹⁹²Ir	99.9825 %

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+
^192m2Ir	168.14(12) keV	241(9) a	(11-)

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-192m1. 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