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Nuclide reference

Rh-103m — Rhodium-103m

The half-life of Rh-103m is 56.114 min. Main decay mode: isomeric transition to Rh-103 (100%).

Identification

Element
Rhodium (Rh)
Atomic number Z
45
Mass number A
103
State
Radioactive

Key quantities

Half-life
56.114 min
Specific activity
1.204e+18 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
40 TBq / 40 TBq
D-value (НП-067-24)
900 TBq

Decay modes

  • isomeric transition → Rh-103 — 100 %

Main gamma lines

Energy, keVYield, %
20.216 · X-ray line4.336
20.0395 · X-ray line2.104
39.7550.07123

Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.

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.

Rhodium-103m (Rh-103m) — reference data

What is in the card

This card gathers the key data of radionuclide Rh-103m 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 Rh-103m 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.