Selenium-83m

Properties and data of the isotope ^83mSe.

Contents

See also: List of individual Selenium isotopes (and general data sources).

General data

Name of the isotope:Selenium-83m; Se-83mSymbol:^83mSe or 83m34SeMass number A:83 (= number of nucleons)Atomic number Z:34 (= number of protons)Neutrons N:49Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4411764705882 (= neutron-proton ratio)Neutron excess (N-Z):15Excitation energy:228.92(7) keVIsotopic mass:82.919119(3) u (atomic weight of Selenium-83m)Nuclide mass:82.9004679 u (calculated nuclear mass without electrons)Mass excess:-75.34017 MeVMass defect:0.77151297200001 u (per nucleus)Nuclear binding energy:718.65970434 MeV (per nucleus)
8.65855065 MeV (average binding energy per nucleon)Half-life:70.1(4) sDecay constant λ:0.0098879768981447 s^-1Specific activity α:7.181309863 × 10⁺¹⁹ Bq g^-1
1940894557.6216 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-

Radioactive Decay

Half-life T_½ = 70.1(4) s respectively 7.01 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁸³Br	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
⁸³Se		22.3(3) min	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 83) with Selenium-83m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 49	Isobar A = 83
27	⁷⁶Co
28	⁷⁷Ni
29	⁷⁸Cu
30	⁷⁹Zn	⁸³Zn
31	⁸⁰Ga	⁸³Ga
32	⁸¹Ge	⁸³Ge
33	⁸²As	⁸³As
34	⁸³Se	⁸³Se
35	⁸⁴Br	⁸³Br
36	⁸⁵Kr	⁸³Kr
37	⁸⁶Rb	⁸³Rb
38	⁸⁷Sr	⁸³Sr
39	⁸⁸Y	⁸³Y
40	⁸⁹Zr	⁸³Zr
41	⁹⁰Nb	⁸³Nb
42	⁹¹Mo	⁸³Mo
43	⁹²Tc
44	⁹³Ru
45	⁹⁴Rh
46	⁹⁵Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn