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Nuclide reference

Pa-234m — Protactinium-234m

Pa-234m की half-life 1.159 min है। मुख्य decay mode: β⁻ decay → U-234 (99.84%)।

Identification

तत्व
Protactinium (Pa)
Atomic number Z
91
Mass number A
234
State
Radioactive

Key quantities

Half-life
1.159 min
विशिष्ट गतिविधि
2.565e+19 Bq/g
Gamma constant Γ
—
D-value (НП-067-24)
—

Decay modes

  • β⁻ decay → U-234 — 99.84 %
  • isomeric transition → Pa-234 — 0.16 %

Main gamma lines

Energy, keVYield, %
1,001.030.8417
766.420.3173
742.8130.1066
258.2270.07642
786.280.05437
13.2818 · X-ray line0.02712
16.4784 · X-ray line0.0224
1,737.750.02129
1,831.360.01742
73.920.01379

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

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max2,273.997.57
1,229.41.002
1,463.90.948
1,487.60.059

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

Related calculators

Decayगतिविधि ↔ द्रव्यमानDose rate
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.

Protactinium-234m (Pa-234m) — reference data

What is in the card

This card gathers the key data of radionuclide Pa-234m 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 Pa-234m 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.