Polonium-226

Properties and data of the isotope ²²⁶Po.

Contents

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

General data

Name of the isotope:Polonium-226; Po-226Symbol:²²⁶Po or 22684PoMass number A:226 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:142Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6904761904762 (= neutron-proton ratio)Neutron excess (N-Z):58Isotopic mass:226.04031(43) u (atomic weight of Polonium-226)Nuclide mass:225.9942347 u (calculated nuclear mass without electrons)Mass excess:37.54852 MeVMass defect:1.84741076 u (per nucleus)Nuclear binding energy:1720.85203848 MeV (per nucleus)
7.61438955 MeV (average binding energy per nucleon)Separation energy:S_N = 5.05(50) MeV (first neutron)Half-life:300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.156681353982 × 10⁺²⁷ Bq g^-1
1.663967933508 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2010

Radioactive Decay

Half-life T_½ = 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²²⁶At	?	2.93(50) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 142) and isobaric (same nucleon number A = 226) with Polonium-226. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 142	Isobar A = 226
84	²²⁶Po	²²⁶Po
85	²²⁷At	²²⁶At
86	²²⁸Rn	²²⁶Rn
87	²²⁹Fr	²²⁶Fr
88	²³⁰Ra	²²⁶Ra
89	²³¹Ac	²²⁶Ac
90	²³²Th	²²⁶Th
91	²³³Pa	²²⁶Pa
92	²³⁴U	²²⁶U
93	²³⁵Np	²²⁶Np
94	²³⁶Pu
95	²³⁷Am
96	²³⁸Cm
97	²³⁹Bk
98	²⁴⁰Cf
99	²⁴¹Es
100	²⁴²Fm