Polonium-213

Properties and data of the isotope ²¹³Po.

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-213; Po-213Symbol:²¹³Po or 21384PoMass number A:213 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:129Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5357142857143 (= neutron-proton ratio)Neutron excess (N-Z):45Isotopic mass:212.992857(3) u (atomic weight of Polonium-213)Nuclide mass:212.9467817 u (calculated nuclear mass without electrons)Mass excess:-6.65366 MeVMass defect:1.782219852 u (per nucleus)Nuclear binding energy:1660.12709882 MeV (per nucleus)
7.79402394 MeV (average binding energy per nucleon)Separation energy:S_N = 4.3554(29) MeV (first neutron)
S_P = 5.825(3) MeV (first proton)Half-life:3.72(2) μsDecay constant λ:186329.8872473 s^-1Specific activity α:5.292947299147 × 10⁺²⁶ Bq g^-1
1.43052629706 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Year of discovery:1947

Radioactive Decay

Half-life T_½ = 3.72(2) μs respectively 3.72 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁰⁹Pb	100 %	8.5361(26) MeV

Parent Nuclides

Direct parent isotopes are: ²¹⁷Rn, ²¹³Bi.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 129) and isobaric (same nucleon number A = 213) with Polonium-213. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 129	Isobar A = 213
78	²⁰⁷Pt
79	²⁰⁸Au
80	²⁰⁹Hg	²¹³Hg
81	²¹⁰Tl	²¹³Tl
82	²¹¹Pb	²¹³Pb
83	²¹²Bi	²¹³Bi
84	²¹³Po	²¹³Po
85	²¹⁴At	²¹³At
86	²¹⁵Rn	²¹³Rn
87	²¹⁶Fr	²¹³Fr
88	²¹⁷Ra	²¹³Ra
89	²¹⁸Ac	²¹³Ac
90	²¹⁹Th	²¹³Th
91	²²⁰Pa	²¹³Pa
92	²²¹U
93	²²²Np