Thallium-214

Properties and data of the isotope ²¹⁴Tl.

Content

General data

Name of the isotope:Thallium-214; Tl-214Symbol:²¹⁴Tl or 21481TlMass number A:214 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:133Isotopic mass:214.00694(21) u (atomic weight of Thallium-214)Nuclide mass:213.96251 u (calculated nuclear mass without electrons)Mass excess:6.46457 MeVMass defect:1.77932142 u (per nucleus)Nuclear binding energy:1657.4272268 MeV (per nucleus)
7.74498704 MeV (average binding energy per nucleon)Separation energy:S_N = 3.39(20) MeV (first neutron)
S_P = 8.49(36) MeV (first proton)Half-life:> 300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.501915822429 × 10⁺²⁷ Bq g^-1
1.757274546602 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = > 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹⁴Pb	?	6.65(20) MeV
β^-, n	²¹³Pb	P	1.6(2) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 133) and isobaric (same nucleon number A = 214) with Thallium-214. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 133	Isobar A = 214
80	²¹³Hg	²¹⁴Hg
81	²¹⁴Tl	²¹⁴Tl
82	²¹⁵Pb	²¹⁴Pb
83	²¹⁶Bi	²¹⁴Bi
84	²¹⁷Po	²¹⁴Po
85	²¹⁸At	²¹⁴At
86	²¹⁹Rn	²¹⁴Rn
87	²²⁰Fr	²¹⁴Fr
88	²²¹Ra	²¹⁴Ra
89	²²²Ac	²¹⁴Ac
90	²²³Th	²¹⁴Th
91	²²⁴Pa	²¹⁴Pa
92	²²⁵U	²¹⁴U
93	²²⁶Np