Iridium-196m

Properties and data of the isotope ^196mIr.

Contents

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

General data

Name of the isotope:Iridium-196m; Ir-196mSymbol:^196mIr or 196m77IrMass number A:196 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:119Isotopic mass:195.96840(4) u (atomic weight of Iridium-196m)
Excitation energy: 410(11) keVNuclide mass:195.9261638 u (calculated nuclear mass without electrons)Mass excess:-29.43521 MeVMass defect:1.665252468 u (per nucleus)Nuclear binding energy:1551.17268243 MeV (per nucleus)
7.91414634 MeV (average binding energy per nucleon)Half-life:1.40(2) hDecay constant λ:0.00013752920249205 s^-1Specific activity α:4.247283229548 × 10⁺¹⁷ Bq g^-1
11479143.863644 Ci g^-1Spin and parity:
(nuclear angular momentum)(10.11-)

Radioactive Decay

Half-life T_½ = 1.40(2) h (hours) respectively 5.040 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹⁶Pt	> 99.7 %
Iso	¹⁹⁶Ir	< 0.3 %

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
¹⁹⁶Ir		52(1) s	(0-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 119) and isobaric (same nucleon number A = 196) with Iridium-196m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 119	Isobar A = 196
73	¹⁹²Ta
74	¹⁹³W	¹⁹⁶W
75	¹⁹⁴Re	¹⁹⁶Re
76	¹⁹⁵Os	¹⁹⁶Os
77	¹⁹⁶Ir	¹⁹⁶Ir
78	¹⁹⁷Pt	¹⁹⁶Pt
79	¹⁹⁸Au	¹⁹⁶Au
80	¹⁹⁹Hg	¹⁹⁶Hg
81	²⁰⁰Tl	¹⁹⁶Tl
82	²⁰¹Pb	¹⁹⁶Pb
83	²⁰²Bi	¹⁹⁶Bi
84	²⁰³Po	¹⁹⁶Po
85	²⁰⁴At	¹⁹⁶At
86	²⁰⁵Rn	¹⁹⁶Rn
87	²⁰⁶Fr
88	²⁰⁷Ra
89	²⁰⁸Ac
90	²⁰⁹Th
91	²¹⁰Pa