Bismuth-193m

Properties and data of the isotope ¹⁹³Bi.

Content

General data

Name of the isotope:Bismuth-193m; Bi-193mSymbol:¹⁹³Bi or 19383BiMass number A:193 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:110Isotopic mass:192.982947(8) u (atomic weight of Bismuth-193m)
Excitation energy: 305(6) keVNuclide mass:192.9374201 u (calculated nuclear mass without electrons)Mass excess:-15.88477 MeVMass defect:1.619671416 u (per nucleus)Nuclear binding energy:1508.71420598 MeV (per nucleus)
7.81717205 MeV (average binding energy per nucleon)Half-life:3.12(26) sDecay constant λ:0.22216255787178 s^-1Specific activity α:6.968199048477 × 10⁺²⁰ Bq g^-1
18832970401.291 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Magnetic dipole moment:μ(μ_N) = 1.500(33)Nuclear g-factor:g_l = 3

Radioactive Decay

Half-life T_½ = 3.12(26) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁹Tl	84(16) %
EE/β⁺	¹⁹³Pb	16(16) %

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
¹⁹³Bi		63.6(30) s	(9/2-)
^193m2Bi	605.53(18) keV	153(10) ns	13/2+
^193m3Bi	2349.6(6) keV	85(3) μs	29/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 193) with Bismuth-193m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 110	Isobar A = 193
69	¹⁷⁹Tm
70	¹⁸⁰Yb
71	¹⁸¹Lu
72	¹⁸²Hf
73	¹⁸³Ta	¹⁹³Ta
74	¹⁸⁴W	¹⁹³W
75	¹⁸⁵Re	¹⁹³Re
76	¹⁸⁶Os	¹⁹³Os
77	¹⁸⁷Ir	¹⁹³Ir
78	¹⁸⁸Pt	¹⁹³Pt
79	¹⁸⁹Au	¹⁹³Au
80	¹⁹⁰Hg	¹⁹³Hg
81	¹⁹¹Tl	¹⁹³Tl
82	¹⁹²Pb	¹⁹³Pb
83	¹⁹³Bi	¹⁹³Bi
84	¹⁹⁴Po	¹⁹³Po
85	¹⁹⁵At	¹⁹³At
86	¹⁹⁶Rn	¹⁹³Rn