Polonium-186

Properties and data of the isotope ¹⁸⁶Po.

Contents

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

General data

Name of the isotope:Polonium-186; Po-186Symbol:¹⁸⁶Po or 18684PoMass number A:186 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:102Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2142857142857 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic mass:186.004403(20) u (atomic weight of Polonium-186)Nuclide mass:185.9583277 u (calculated nuclear mass without electrons)Mass excess:4.10137 MeVMass defect:1.53672112 u (per nucleus)Nuclear binding energy:1431.44650295 MeV (per nucleus)
7.69594894 MeV (average binding energy per nucleon)Separation energy:
S_P = 7.69595(10) MeV (first proton)Half-life:28 μsDecay constant λ:24755.256448569 s^-1Specific activity α:8.015034481566 × 10⁺²⁵ Bq g^-1
2.166225535558 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2005

Radioactive Decay

Half-life T_½ = 28 μs respectively 2.8 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸²Pb	~ 100 %	8.501(14) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 102) and isobaric (same nucleon number A = 186) with Polonium-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 102	Isobar A = 186
60	¹⁶²Nd
61	¹⁶³Pm
62	¹⁶⁴Sm
63	¹⁶⁵Eu
64	¹⁶⁶Gd
65	¹⁶⁷Tb
66	¹⁶⁸Dy
67	¹⁶⁹Ho
68	¹⁷⁰Er
69	¹⁷¹Tm
70	¹⁷²Yb
71	¹⁷³Lu	¹⁸⁶Lu
72	¹⁷⁴Hf	¹⁸⁶Hf
73	¹⁷⁵Ta	¹⁸⁶Ta
74	¹⁷⁶W	¹⁸⁶W
75	¹⁷⁷Re	¹⁸⁶Re
76	¹⁷⁸Os	¹⁸⁶Os
77	¹⁷⁹Ir	¹⁸⁶Ir
78	¹⁸⁰Pt	¹⁸⁶Pt
79	¹⁸¹Au	¹⁸⁶Au
80	¹⁸²Hg	¹⁸⁶Hg
81	¹⁸³Tl	¹⁸⁶Tl
82	¹⁸⁴Pb	¹⁸⁶Pb
83	¹⁸⁵Bi	¹⁸⁶Bi
84	¹⁸⁶Po	¹⁸⁶Po