Polonium-193

Properties and data of the isotope ¹⁹³Po.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Polonium-193; Po-193Symbol:¹⁹³Po or 19384PoMass number A:193 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:109Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.297619047619 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:192.991062(16) u (atomic weight of Polonium-193)Nuclide mass:192.9449867 u (calculated nuclear mass without electrons)Mass excess:-8.32569 MeVMass defect:1.610716532 u (per nucleus)Nuclear binding energy:1500.37278526 MeV (per nucleus)
7.77395226 MeV (average binding energy per nucleon)Separation energy:S_N = 8.326(18) MeV (first neutron)
S_P = 2.08(3) MeV (first proton)Half-life:0.399(34) sDecay constant λ:1.737210978847 s^-1Specific activity α:5.448817301065 × 10⁺²¹ Bq g^-1
147265332461.22 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Magnetic dipole moment:μ(μ_N) = -0.389(3)Quadrupole moment Q:-1.31(30) barn (100 fm²)Nuclear g-factor:g_l = -0.25933333333333Year of discovery:1967

Radioactive Decay

Half-life T_½ = 0.399(34) s respectively 3.99 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁹Pb	≤ 100 %	7.094(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁷Rn.

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
^193mPo	100(6) keV	245(22) ms	(13/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 193) with Polonium-193. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 109	Isobar A = 193
68	¹⁷⁷Er
69	¹⁷⁸Tm
70	¹⁷⁹Yb
71	¹⁸⁰Lu
72	¹⁸¹Hf
73	¹⁸²Ta	¹⁹³Ta
74	¹⁸³W	¹⁹³W
75	¹⁸⁴Re	¹⁹³Re
76	¹⁸⁵Os	¹⁹³Os
77	¹⁸⁶Ir	¹⁹³Ir
78	¹⁸⁷Pt	¹⁹³Pt
79	¹⁸⁸Au	¹⁹³Au
80	¹⁸⁹Hg	¹⁹³Hg
81	¹⁹⁰Tl	¹⁹³Tl
82	¹⁹¹Pb	¹⁹³Pb
83	¹⁹²Bi	¹⁹³Bi
84	¹⁹³Po	¹⁹³Po
85	¹⁹⁴At	¹⁹³At
86	¹⁹⁵Rn	¹⁹³Rn