Iridium-170m

Properties and data of the isotope ¹⁷⁰Ir.

Content

General data

Name of the isotope:Iridium-170m; Ir-170mSymbol:¹⁷⁰Ir or 17077IrMass number A:170 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:93Isotopic mass:169.97492(9) u (atomic weight of Iridium-170m)
Excitation energy: +x keVNuclide mass:169.9326838 u (calculated nuclear mass without electrons)Mass excess:-23.36187 MeVMass defect:1.433444652 u (per nucleus)Nuclear binding energy:1335.24509267 MeV (per nucleus)
7.8543829 MeV (average binding energy per nucleon)Half-life:811(18) msDecay constant λ:0.854682096868 s^-1Specific activity α:3.045571584500 × 10⁺²¹ Bq g^-1
82312745527.03 Ci g^-1Spin and parity:
(nuclear angular momentum)(8+)

Radioactive Decay

Half-life T_½ = 811(18) ms respectively 8.11 × 10^-1 seconds s.

Decay mode	Daughter	Probability
α	¹⁶⁶Re	38(5) %
EE/β⁺	¹⁷⁰Os	?
Iso	¹⁷⁰Ir	?

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
¹⁷⁰Ir		0.87 s	(3-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 170) with Iridium-170m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 93	Isobar A = 170
54	¹⁴⁷Xe
55	¹⁴⁸Cs
56	¹⁴⁹Ba
57	¹⁵⁰La
58	¹⁵¹Ce
59	¹⁵²Pr
60	¹⁵³Nd
61	¹⁵⁴Pm
62	¹⁵⁵Sm
63	¹⁵⁶Eu
64	¹⁵⁷Gd	¹⁷⁰Gd
65	¹⁵⁸Tb	¹⁷⁰Tb
66	¹⁵⁹Dy	¹⁷⁰Dy
67	¹⁶⁰Ho	¹⁷⁰Ho
68	¹⁶¹Er	¹⁷⁰Er
69	¹⁶²Tm	¹⁷⁰Tm
70	¹⁶³Yb	¹⁷⁰Yb
71	¹⁶⁴Lu	¹⁷⁰Lu
72	¹⁶⁵Hf	¹⁷⁰Hf
73	¹⁶⁶Ta	¹⁷⁰Ta
74	¹⁶⁷W	¹⁷⁰W
75	¹⁶⁸Re	¹⁷⁰Re
76	¹⁶⁹Os	¹⁷⁰Os
77	¹⁷⁰Ir	¹⁷⁰Ir
78	¹⁷¹Pt	¹⁷⁰Pt
79	¹⁷²Au	¹⁷⁰Au
80	¹⁷³Hg