All tools

Nuclide reference

Ce-143 — Cerium-143

The half-life of Ce-143 is 1.3766 d. Main decay mode: β⁻ decay to Pr-143 (100%).

Identification

Element
Cerium (Ce)
Atomic number Z
58
Mass number A
143
State
Radioactive

Key quantities

Half-life
1.3766 d
Specific activity
2.454e+16 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
0.9 TBq / 0.6 TBq
D-value (НП-067-24)
0.3 TBq

Decay modes

  • β⁻ decay → Pr-143 — 100 %

Main gamma lines

Energy, keVYield, %
293.26642.8
36.026 · X-ray line32.14
35.55 · X-ray line17.6
57.35611.73
664.5715.692
721.9295.393
350.6193.231
490.3682.161
231.552.054
880.461.031

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

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max1,110.948.3
1,404.135
739.5813.2
523.681.36

For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.

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.

Cerium-143 (Ce-143) — reference data

What is in the card

This card gathers the key data of radionuclide Ce-143 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 Ce-143 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.