Thorium-214

Properties and data of the isotope ²¹⁴Th.

Content

General data

Name of the isotope:Thorium-214; Th-214Symbol:²¹⁴Th or 21490ThMass number A:214 (= number of nucleons)Atomic number Z:90 (= number of protons)Neutrons N:124Isotopic mass:214.011481(11) u (atomic weight of Thorium-214)Nuclide mass:213.9621152 u (calculated nuclear mass without electrons)Mass excess:10.69448 MeVMass defect:1.767221464 u (per nucleus)Nuclear binding energy:1646.15619039 MeV (per nucleus)
7.69231865 MeV (average binding energy per nucleon)Separation energy:S_N = 9.497(14) MeV (first neutron)
S_P = 2.749(19) MeV (first proton)Half-life:87(10) msDecay constant λ:7.9672089719534 s^-1Specific activity α:2.242039938768 × 10⁺²² Bq g^-1
605956740207.81 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1968

Radioactive Decay

Half-life T_½ = 87(10) ms respectively 8.7 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹⁰Ra	100 %	7.827(5) MeV

Parent Nuclides

Direct parent isotope is: ²¹⁸U.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^214mTh	2181.0(27) keV	1.24(12) μs	(8+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 214) with Thorium-214. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 124	Isobar A = 214
75	¹⁹⁹Re
76	²⁰⁰Os
77	²⁰¹Ir
78	²⁰²Pt
79	²⁰³Au
80	²⁰⁴Hg	²¹⁴Hg
81	²⁰⁵Tl	²¹⁴Tl
82	²⁰⁶Pb	²¹⁴Pb
83	²⁰⁷Bi	²¹⁴Bi
84	²⁰⁸Po	²¹⁴Po
85	²⁰⁹At	²¹⁴At
86	²¹⁰Rn	²¹⁴Rn
87	²¹¹Fr	²¹⁴Fr
88	²¹²Ra	²¹⁴Ra
89	²¹³Ac	²¹⁴Ac
90	²¹⁴Th	²¹⁴Th
91	²¹⁵Pa	²¹⁴Pa
92	²¹⁶U	²¹⁴U