Rhenium-190m

Properties and data of the isotope ^190mRe.

Contents

General data

Name of the isotope:Rhenium-190m; Re-190mSymbol:^190mRe or 190m75ReMass number A:190 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:115Isotopic mass:189.96174(8) u (atomic weight of Rhenium-190m)
Excitation energy: 210(50) keVNuclide mass:189.9206007 u (calculated nuclear mass without electrons)Mass excess:-35.63896 MeVMass defect:1.62160274 u (per nucleus)Nuclear binding energy:1510.51322269 MeV (per nucleus)
7.95006959 MeV (average binding energy per nucleon)Half-life:3.2(2) hDecay constant λ:6.016902609027 × 10^-5 s^-1Specific activity α:1.917176457782 × 10⁺¹⁷ Bq g^-1
5181557.9940059 Ci g^-1Spin and parity:
(nuclear angular momentum)(6-)

Radioactive Decay

Half-life T_½ = 3.2(2) h (hours) respectively 1.1520 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹⁰Os	54.4(20) %
Iso	¹⁹⁰Re	45.6(20) %

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
¹⁹⁰Re		3.1(3) min	(2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 190) with Rhenium-190m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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