Thorium-213

Properties and data of the isotope ²¹³Th.

Content

General data

Name of the isotope:Thorium-213; Th-213Symbol:²¹³Th or 21390ThMass number A:213 (= number of nucleons)Atomic number Z:90 (= number of protons)Neutrons N:123Isotopic mass:213.013011(10) u (atomic weight of Thorium-213)Nuclide mass:212.9636452 u (calculated nuclear mass without electrons)Mass excess:12.11967 MeVMass defect:1.757026548 u (per nucleus)Nuclear binding energy:1636.6596873 MeV (per nucleus)
7.6838483 MeV (average binding energy per nucleon)Separation energy:S_N = 8.062(14) MeV (first neutron)
S_P = 2.45(5) MeV (first proton)Half-life:144(21) msDecay constant λ:4.8135220872218 s^-1Specific activity α:1.360925260172 × 10⁺²² Bq g^-1
367817637884.35 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1968

Radioactive Decay

Half-life T_½ = 144(21) ms respectively 1.44 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁰⁹Ra	≤ 100 %	7.837(7) MeV

Parent Nuclides

Direct parent isotope is: ²¹⁷U.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 213) with Thorium-213. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 123	Isobar A = 213
74	¹⁹⁷W
75	¹⁹⁸Re
76	¹⁹⁹Os
77	²⁰⁰Ir
78	²⁰¹Pt
79	²⁰²Au
80	²⁰³Hg	²¹³Hg
81	²⁰⁴Tl	²¹³Tl
82	²⁰⁵Pb	²¹³Pb
83	²⁰⁶Bi	²¹³Bi
84	²⁰⁷Po	²¹³Po
85	²⁰⁸At	²¹³At
86	²⁰⁹Rn	²¹³Rn
87	²¹⁰Fr	²¹³Fr
88	²¹¹Ra	²¹³Ra
89	²¹²Ac	²¹³Ac
90	²¹³Th	²¹³Th
91	²¹⁴Pa	²¹³Pa
92	²¹⁵U