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Nuclide reference

Xe-135m — Xenon-135m

Xe-135m की half-life 15.29 min है। मुख्य decay mode: isomeric transition → Xe-135 (99.7%)।

Identification

तत्व
Xenon (Xe)
Atomic number Z
54
Mass number A
135
State
Radioactive

Key quantities

Half-life
15.29 min
विशिष्ट गतिविधि
3.37e+18 Bq/g
Gamma constant Γ
—
D-value (НП-067-24)
—

Decay modes

  • isomeric transition → Xe-135 — 99.7 %
  • β⁻ decay → Cs-135 — 0.3 %

Main gamma lines

Energy, keVYield, %
526.56180.6
29.778 · X-ray line7.298
29.458 · X-ray line3.937
786.90.0044
1,1330.0003
1,3580.0002

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

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.

Xenon-135m (Xe-135m) — reference data

What is in the card

This card gathers the key data of radionuclide Xe-135m 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 Xe-135m 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.