Bismuth-203m

Properties and data of the isotope ^203mBi.

Contents

General data

Name of the isotope:Bismuth-203m; Bi-203mSymbol:^203mBi or 203m83BiMass number A:203 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:120Isotopic mass:202.976892(14) u (atomic weight of Bismuth-203m)
Excitation energy: 1098.12(12) keVNuclide mass:202.9313651 u (calculated nuclear mass without electrons)Mass excess:-21.52496 MeVMass defect:1.712375576 u (per nucleus)Nuclear binding energy:1595.06757479 MeV (per nucleus)
7.85747574 MeV (average binding energy per nucleon)Half-life:305(5) msDecay constant λ:2.2726137067539 s^-1Specific activity α:6.775247456581 × 10⁺²¹ Bq g^-1
183114796123.83 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+

Radioactive Decay

Half-life T_½ = 305(5) ms respectively 3.05 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	²⁰³Bi	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
²⁰³Bi		11.76(5) h	9/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 203) with Bismuth-203m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 120	Isobar A = 203
73	¹⁹³Ta
74	¹⁹⁴W
75	¹⁹⁵Re
76	¹⁹⁶Os	²⁰³Os
77	¹⁹⁷Ir	²⁰³Ir
78	¹⁹⁸Pt	²⁰³Pt
79	¹⁹⁹Au	²⁰³Au
80	²⁰⁰Hg	²⁰³Hg
81	²⁰¹Tl	²⁰³Tl
82	²⁰²Pb	²⁰³Pb
83	²⁰³Bi	²⁰³Bi
84	²⁰⁴Po	²⁰³Po
85	²⁰⁵At	²⁰³At
86	²⁰⁶Rn	²⁰³Rn
87	²⁰⁷Fr	²⁰³Fr
88	²⁰⁸Ra	²⁰³Ra
89	²⁰⁹Ac	²⁰³Ac
90	²¹⁰Th