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Nuclide reference

Rb-83 — Rubidium-83

The half-life of Rb-83 is 86.2 d. Main decay mode: electron capture to Kr-83m (74.26%).

Identification

Element
Rubidium (Rb)
Atomic number Z
37
Mass number A
83
State
Radioactive

Key quantities

Half-life
86.2 d
Specific activity
6.753e+14 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
2 TBq / 2 TBq
D-value (НП-067-24)
0.1 TBq

Decay modes

  • electron capture → Kr-83m — 74.26 %
  • electron capture → Kr-83 — 25.74 %

Main gamma lines

Energy, keVYield, %
520.39944.7
12.648 · X-ray line32.32
529.59429.32
12.596 · X-ray line16.76
552.55115.96
9.4051 (Kr-83m)4.294
9.40511.329
790.150.6571
799.370.2369
648.970.08493

Includes daughter nuclides in equilibrium: Kr-83m (yield per decay of Rb-83); the emitting nuclide is in brackets. Equilibrium is reached in about 13 h.

Related calculators

DecayActivity ↔ massSource categoryDose rateA1/A2 and package type
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.K-series X-ray energies are from NIST SRD 128 (Deslattes et al., 2003): in ENDF/B-VIII.0 they are given to 1 % and shifted by up to 0.7 keV for heavy elements. L-series lines and all yields are ENDF/B-VIII.0.

Rubidium-83 (Rb-83) — reference data

What is in the card

This card gathers the key data of radionuclide Rb-83 in one place: half-life, decay modes, main gamma lines, alpha and beta particle energies, gamma constant, specific activity and the D-value for source categorization. Decay and emission data are from ENDF/B-VIII.0; the D-value follows NP-067-24; the gamma constant is the ambient dose equivalent H*(10) at 1 m, computed from ICRP-107 spectra.

How to use the data

Half-life and specific activity let you recalculate the activity of a Rb-83 source to the delivery or disposal date — use the decay calculator. Gamma lines with yields identify the nuclide from a spectrum and pick the line for gamma spectrometry; the gamma constant Γ gives the dose rate at a distance, while the D-value and A1/A2 set the source category and the package type for transport.