Polonium-200

Properties and data of the isotope ²⁰⁰Po.

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-200; Po-200Symbol:²⁰⁰Po or 20084PoMass number A:200 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:116Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3809523809524 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:199.981812(8) u (atomic weight of Polonium-200)Nuclide mass:199.9357367 u (calculated nuclear mass without electrons)Mass excess:-16.94201 MeVMass defect:1.680620944 u (per nucleus)Nuclear binding energy:1565.48832561 MeV (per nucleus)
7.82744163 MeV (average binding energy per nucleon)Separation energy:S_N = 9.805(20) MeV (first neutron)
S_P = 3.433(13) MeV (first proton)Half-life:11.51(8) minDecay constant λ:0.0010036883587604 s^-1Specific activity α:3.037363153735 × 10⁺¹⁸ Bq g^-1
82090896.046911 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.5199(178) femtometer fmYear of discovery:1951

Radioactive Decay

Half-life T_½ = 11.51(8) min (minutes) respectively 6.906 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁹⁶Pb	11.1(3) %	5.9816(18) MeV
EC/β⁺	²⁰⁰Bi	88.9(3) %	3.429(24) MeV

Parent Nuclides

Direct parent isotopes are: ²⁰⁴Rn, ²⁰⁰At.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 116) and isobaric (same nucleon number A = 200) with Polonium-200. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 116	Isobar A = 200
71	¹⁸⁷Lu
72	¹⁸⁸Hf
73	¹⁸⁹Ta
74	¹⁹⁰W
75	¹⁹¹Re
76	¹⁹²Os	²⁰⁰Os
77	¹⁹³Ir	²⁰⁰Ir
78	¹⁹⁴Pt	²⁰⁰Pt
79	¹⁹⁵Au	²⁰⁰Au
80	¹⁹⁶Hg	²⁰⁰Hg
81	¹⁹⁷Tl	²⁰⁰Tl
82	¹⁹⁸Pb	²⁰⁰Pb
83	¹⁹⁹Bi	²⁰⁰Bi
84	²⁰⁰Po	²⁰⁰Po
85	²⁰¹At	²⁰⁰At
86	²⁰²Rn	²⁰⁰Rn
87	²⁰³Fr	²⁰⁰Fr
88	²⁰⁴Ra
89	²⁰⁵Ac