Technetium-120

Properties and data of the isotope ¹²⁰Tc.

Contents

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

General data

Name of the isotope:Technetium-120; Tc-120Symbol:¹²⁰Tc or 12043TcMass number A:120 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:77Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.7906976744186 (= neutron-proton ratio)Neutron excess (N-Z):34Isotopic mass:119.96187(54) u (atomic weight of Technetium-120)Nuclide mass:119.9382822 u (calculated nuclear mass without electrons)Mass excess:-35.51787 MeVMass defect:1.041804908 u (per nucleus)Nuclear binding energy:970.43502097 MeV (per nucleus)
8.08695851 MeV (average binding energy per nucleon)Separation energy:S_N = 3.22(71) MeV (first neutron)Half-life:21(5) msDecay constant λ:33.007008598093 s^-1Specific activity α:1.670360127250 × 10⁺²³ Bq g^-1
4514486830407.8 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 21(5) ms respectively 2.1 × 10^-2 seconds s.

Decay mode	Daughter	Decay energy
β^-	¹²⁰Ru	14.49(64) MeV
β^-, n	¹¹⁹Ru	8.97(58) MeV
β^-, 2n	¹¹⁸Ru

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 120) with Technetium-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 77	Isobar A = 120
43	¹²⁰Tc	¹²⁰Tc
44	¹²¹Ru	¹²⁰Ru
45	¹²²Rh	¹²⁰Rh
46	¹²³Pd	¹²⁰Pd
47	¹²⁴Ag	¹²⁰Ag
48	¹²⁵Cd	¹²⁰Cd
49	¹²⁶In	¹²⁰In
50	¹²⁷Sn	¹²⁰Sn
51	¹²⁸Sb	¹²⁰Sb
52	¹²⁹Te	¹²⁰Te
53	¹³⁰I	¹²⁰I
54	¹³¹Xe	¹²⁰Xe
55	¹³²Cs	¹²⁰Cs
56	¹³³Ba	¹²⁰Ba
57	¹³⁴La	¹²⁰La
58	¹³⁵Ce	¹²⁰Ce
59	¹³⁶Pr
60	¹³⁷Nd
61	¹³⁸Pm
62	¹³⁹Sm
63	¹⁴⁰Eu
64	¹⁴¹Gd
65	¹⁴²Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm