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Europium-152

Properties and data of the isotope 152Eu.

 

Eu-152 is a radioisotope of the chemical element Europium. The atomic nucleus of the nuclide is composed of 89 neutrons and 63 protons; this results in a mass number of 152.

See also: list of Europium isotopes.

 

General data

Name of the isotope:Europium-152; Eu-152Symbol:152EuMass number A:152Atomic number Z:63 (= number of protons)Neutrons N:89Isotopic mass:151.9217512(14) u (atomic weight of Europium-152)Nuclide mass:151.8871934 u (calculated nuclear mass without electrons)Mass excess:-72.88829 MeVMass defect:1.34240334 u (per nucleus)Nuclear binding energy:1250.44065679 MeV (per nucleus)
8.22658327 MeV (average binding energy per nucleon)
Separation energy:SN = 6.30672(10) MeV (first neutron)
SP = 5.6009(5) MeV (first proton)
Half-life:13.517(9) aDecay constant λ:1.626067389930 × 10-9 s-1Spin and parity:3-Charge radius:5.1064(66) femtometer fmYear of discovery:1938

 

Radioactive Decay

Half-life T½ = 13.517(9) a respectively 4.26272112 × 108 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+152Sm72,08(13) %1,8743(18) MeV
β-152Gd27,92(13) %1,8187(7) MeV

 

The diagram below shows a calculated spectrum with the most intense gamma emissions of the isotope europium-152:

 

Eu-152 decay scheme

 

Radiation Protection

The German Radiation Protection Ordinance, for example, specifies the following limit values for the isotope Europium-152 (exemption limits, clearance values and other values as a radioactive or highly radioactive source of radiation (HASS)):

Isotope:Eu-152Exemption level:106 BqExemption level per gram:0,1 Bq/g
Unrestricted handling of solids and liquids.
Activity HASS:0,06 TBqSurface contamination:1 Bq cm-2Half-life:13.5 d

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
152m1Eu45,5998(4) keV9,3116(13) Stunden0-
152m2Eu65,2969(4)0,94(8) μs1-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 152) with Europium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 89Isobar A = 152
50139Sn
51140Sb
52141Te
53142I
54143Xe
55144Cs
56145Ba152Ba
57146La152La
58147Ce152Ce
59148Pr152Pr
60149Nd152Nd
61150Pm152Pm
62151Sm152Sm
63152Eu152Eu
64153Gd152Gd
65154Tb152Tb
66155Dy152Dy
67156Ho152Ho
68157Er152Er
69158Tm152Tm
70159Yb152Yb
71160Lu152Lu
72161Hf
73162Ta
74163W
75164Re
76165Os
77166Ir
78167Pt

 

External data and identifiers

CAS:14683-23-9InChI Key:OGPBJKLSAFTDLK-IGMARMGPSA-NSMILES:[152Eu]PubChem:ID 104907Adopted Levels, Gammas:NuDat 152Eu

 


Category: Isotopes

Last update: 26.11.2022



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