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Nuclide reference

U-233 — Uranium-233

The half-life of U-233 is 159,200 years. Main decay mode: α decay to Th-229 (100%).

Identification

Element
Uranium (U)
Atomic number Z
92
Mass number A
233
State
Radioactive

Key quantities

Half-life
159,200 years
Specific activity
356,600,000 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
40 TBq / 0.006 TBq
D-value (НП-067-24)
0.07 TBq

Decay modes

Main gamma lines

Energy, keVYield, %
16.0978 · X-ray line2.439
12.9597 · X-ray line2.344
42.43490.072
97.13460.0203
54.70390.0168
42.63330.0132
29.18510.0078
317.1690.00737
146.3460.0065
164.5240.006

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

Alpha and beta particles

RadiationEnergy, keVYield, %
α4,824.284.3
4,783.513.2
4,7291.61
4,7960.28

Related calculators

DecayActivity ↔ massSource categoryDose rateA1/A2 and package type

Other isotopes of this element

U-235U-238
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.

Uranium-233 (U-233) — reference data

What is in the card

This card gathers the key data of radionuclide U-233 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 U-233 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.