Bismuth-194m2

Properties and data of the isotope ¹⁹⁴Bi.

Content

General data

Name of the isotope:Bismuth-194m2; Bi-194m2Symbol:¹⁹⁴Bi or 19483BiMass number A:194 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:111Isotopic mass:193.982792(7) u (atomic weight of Bismuth-194m2)
Excitation energy: +y keVNuclide mass:193.9372651 u (calculated nuclear mass without electrons)Mass excess:-16.02915 MeVMass defect:1.628491332 u (per nucleus)Nuclear binding energy:1516.92990481 MeV (per nucleus)
7.81922631 MeV (average binding energy per nucleon)Half-life:125(2) sDecay constant λ:0.0055451774444796 s^-1Specific activity α:1.730250759792 × 10⁺¹⁹ Bq g^-1
467635340.48451 Ci g^-1Spin and parity:
(nuclear angular momentum)(6+.7+)

Radioactive Decay

Half-life T_½ = 125(2) s respectively 1.25 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁹⁴Pb	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
¹⁹⁴Bi		95(3) s	(3+)
^194m1Bi	+x keV	115(4) s	(10-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 194) with Bismuth-194m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 111	Isobar A = 194
70	¹⁸¹Yb
71	¹⁸²Lu
72	¹⁸³Hf
73	¹⁸⁴Ta	¹⁹⁴Ta
74	¹⁸⁵W	¹⁹⁴W
75	¹⁸⁶Re	¹⁹⁴Re
76	¹⁸⁷Os	¹⁹⁴Os
77	¹⁸⁸Ir	¹⁹⁴Ir
78	¹⁸⁹Pt	¹⁹⁴Pt
79	¹⁹⁰Au	¹⁹⁴Au
80	¹⁹¹Hg	¹⁹⁴Hg
81	¹⁹²Tl	¹⁹⁴Tl
82	¹⁹³Pb	¹⁹⁴Pb
83	¹⁹⁴Bi	¹⁹⁴Bi
84	¹⁹⁵Po	¹⁹⁴Po
85	¹⁹⁶At	¹⁹⁴At
86	¹⁹⁷Rn	¹⁹⁴Rn