Bismuth-188

Properties and data of the isotope ¹⁸⁸Bi.

Contents

General data

Name of the isotope:Bismuth-188; Bi-188Symbol:¹⁸⁸Bi or 18883BiMass number A:188 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:105Isotopic mass:187.992276(12) u (atomic weight of Bismuth-188)Nuclide mass:187.9467491 u (calculated nuclear mass without electrons)Mass excess:-7.19486 MeVMass defect:1.567017836 u (per nucleus)Nuclear binding energy:1459.66771213 MeV (per nucleus)
7.76418996 MeV (average binding energy per nucleon)Separation energy:S_N = 8.883(15) MeV (first neutron)
S_P = -503(12) MeV (first proton)Half-life:60(3) msDecay constant λ:11.552453009332 s^-1Specific activity α:3.720347556149 × 10⁺²² Bq g^-1
1005499339499.9 Ci g^-1Spin and parity:
(nuclear angular momentum)(3+)Year of discovery:1980

Radioactive Decay

Half-life T_½ = 60(3) ms respectively 6.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁴Tl	~100 %	7.264(5) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 188) with Bismuth-188. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 105	Isobar A = 188
63	¹⁶⁸Eu
64	¹⁶⁹Gd
65	¹⁷⁰Tb
66	¹⁷¹Dy
67	¹⁷²Ho
68	¹⁷³Er
69	¹⁷⁴Tm
70	¹⁷⁵Yb
71	¹⁷⁶Lu	¹⁸⁸Lu
72	¹⁷⁷Hf	¹⁸⁸Hf
73	¹⁷⁸Ta	¹⁸⁸Ta
74	¹⁷⁹W	¹⁸⁸W
75	¹⁸⁰Re	¹⁸⁸Re
76	¹⁸¹Os	¹⁸⁸Os
77	¹⁸²Ir	¹⁸⁸Ir
78	¹⁸³Pt	¹⁸⁸Pt
79	¹⁸⁴Au	¹⁸⁸Au
80	¹⁸⁵Hg	¹⁸⁸Hg
81	¹⁸⁶Tl	¹⁸⁸Tl
82	¹⁸⁷Pb	¹⁸⁸Pb
83	¹⁸⁸Bi	¹⁸⁸Bi
84	¹⁸⁹Po	¹⁸⁸Po
85	¹⁹⁰At