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Radium-203

Properties and data of the isotope 203Ra.


Content

See also: list of Radium isotopes.

 

General data

Name of the isotope:Radium-203; Ra-203Symbol:203Ra or 20388RaMass number A:203 (= number of nucleons)Atomic number Z:88 (= number of protons)Neutrons N:115Isotopic mass:203.00930(4) u (atomic weight of Radium-203)Nuclide mass:202.961031 u (calculated nuclear mass without electrons)Mass excess:8.66289 MeVMass defect:1.675768156 u (per nucleus)Nuclear binding energy:1560.96798271 MeV (per nucleus)
7.68949745 MeV (average binding energy per nucleon)
Separation energy:SN = 8.48(4) MeV (first neutron)
SP = 1.72(4) MeV (first proton)
Half-life:ca. 31 msDecay constant λ:22.359586469676 s-1Specific activity α:6.63313198474 × 10+22 Bq g-1
1792738374255.4 Ci g-1
Spin and parity:
(nuclear angular momentum)
(3/2-)Year of discovery:1996

 

Radioactive Decay

Half-life T½ = ca. 31 ms respectively 3.1 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α199Rn~100 %7.736(6) MeV
β+203Frrarely

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
203mRa220(90) keVca. 24 ms(13/2+)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 203) with Radium-203. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 115Isobar A = 203
70185Yb
71186Lu
72187Hf
73188Ta
74189W
75190Re
76191Os203Os
77192Ir203Ir
78193Pt203Pt
79194Au203Au
80195Hg203Hg
81196Tl203Tl
82197Pb203Pb
83198Bi203Bi
84199Po203Po
85200At203At
86201Rn203Rn
87202Fr203Fr
88203Ra203Ra
89204Ac

 

External data and identifiers

Adopted Levels, Gammas:NuDat 203Ra

 


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Last update: 2020-10-23


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