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Nuclide reference

Ce-144 — Cerium-144

Ce-144 की half-life 284.91 d है। मुख्य decay mode: β⁻ decay → Pr-144 (99.05%)।

Identification

तत्व
Cerium (Ce)
Atomic number Z
58
Mass number A
144
State
Radioactive

Key quantities

Half-life
284.91 d
विशिष्ट गतिविधि
1.178e+14 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
0.2 TBq / 0.2 TBq
D-value (НП-067-24)
0.9 TBq

Decay modes

  • β⁻ decay → Pr-144 — 99.05 %
  • β⁻ decay → Pr-144m — 0.9548 %

Main gamma lines

Energy, keVYield, %
133.51511.09
36.026 · X-ray line4.3
35.55 · X-ray line2.353
80.121.364
696.51 (Pr-144)1.342
2,185.66 (Pr-144)0.6938
1,489.16 (Pr-144)0.2778
40.980.2573
33.5680.1996
53.3950.09981

Includes daughter nuclides in equilibrium: Pr-144 (yield per decay of Ce-144); the emitting nuclide is in brackets. Equilibrium is reached in about 2 h.

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max318.776.5
185.1819.6
238.583.9
2,997.5 (Pr-144)97.9

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

Related calculators

Decayगतिविधि ↔ द्रव्यमानSource categoryDose rateA1/A2 और 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 1 m पर H*(10) है, ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) से गणना की गई, equilibrium में short-lived progeny सहित (जैसे Cs-137/Ba-137m, Ra-226 series); specific activity molar mass M ≈ mass number A का उपयोग करती है।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-144 (Ce-144) — reference data

What is in the card

This card gathers the key data of radionuclide Ce-144 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-144 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.