Rhenium-188m

Properties and data of the isotope ¹⁸⁸Re.

Content

General data

Name of the isotope:Rhenium-188m; Re-188mSymbol:¹⁸⁸Re or 18875ReMass number A:188 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:113Isotopic mass:187.9581137(8) u (atomic weight of Rhenium-188m)
Excitation energy: 172.0848(24) keVNuclide mass:187.9169744 u (calculated nuclear mass without electrons)Mass excess:-39.01684 MeVMass defect:1.607899208 u (per nucleus)Nuclear binding energy:1497.74846486 MeV (per nucleus)
7.96674715 MeV (average binding energy per nucleon)Half-life:18.59(4) minDecay constant λ:0.00062143372831266 s^-1Specific activity α:2.001262805890 × 10⁺¹⁸ Bq g^-1
54088183.942976 Ci g^-1Spin and parity:
(nuclear angular momentum)6-

Radioactive Decay

Half-life T_½ = 18.59(4) min (minutes) respectively 1.1154 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁸⁸Re	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
¹⁸⁸Re		17.005(3) h	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 113) and isobaric (same nucleon number A = 188) with Rhenium-188m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 113	Isobar A = 188
70	¹⁸³Yb
71	¹⁸⁴Lu	¹⁸⁸Lu
72	¹⁸⁵Hf	¹⁸⁸Hf
73	¹⁸⁶Ta	¹⁸⁸Ta
74	¹⁸⁷W	¹⁸⁸W
75	¹⁸⁸Re	¹⁸⁸Re
76	¹⁸⁹Os	¹⁸⁸Os
77	¹⁹⁰Ir	¹⁸⁸Ir
78	¹⁹¹Pt	¹⁸⁸Pt
79	¹⁹²Au	¹⁸⁸Au
80	¹⁹³Hg	¹⁸⁸Hg
81	¹⁹⁴Tl	¹⁸⁸Tl
82	¹⁹⁵Pb	¹⁸⁸Pb
83	¹⁹⁶Bi	¹⁸⁸Bi
84	¹⁹⁷Po	¹⁸⁸Po
85	¹⁹⁸At
86	¹⁹⁹Rn
87	²⁰⁰Fr
88	²⁰¹Ra