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Nuclide reference

Mo-93 — Molybdenum-93

The half-life of Mo-93 is 4,000 years. Main decay mode: electron capture to Nb-93m (88%).

Identification

Element
Molybdenum (Mo)
Atomic number Z
42
Mass number A
93
State
Radioactive

Key quantities

Half-life
4,000 years
Specific activity
3.556e+10 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
40 TBq / 20 TBq
D-value (НП-067-24)
300 TBq

Decay modes

  • electron capture → Nb-93m — 88 %
  • electron capture → Nb-93 — 12 %

Main gamma lines

Energy, keVYield, %
16.616 · X-ray line35.15
16.521 · X-ray line18.39
18.624 · X-ray line5.487
18.609 · X-ray line2.818
2.15699 · X-ray line2.213
2.26454 · X-ray line1.101
18.948 · X-ray line0.9526
18.948 · X-ray line0.4982
1.92643 · X-ray line0.444
2.51733 · X-ray line0.0475

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

Related calculators

DecayActivity ↔ massSource categoryDose rateA1/A2 and package type

Other isotopes of this element

Mo-99
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.

Molybdenum-93 (Mo-93) — reference data

What is in the card

This card gathers the key data of radionuclide Mo-93 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 Mo-93 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.