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Nuclide reference

Y-91m — Yttrium-91m

Y-91m की half-life 49.71 min है। मुख्य decay mode: isomeric transition → Y-91 (100%)।

Identification

तत्व
Yttrium (Y)
Atomic number Z
39
Mass number A
91
State
Radioactive

Key quantities

Half-life
49.71 min
विशिष्ट गतिविधि
1.538e+18 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
2 TBq / 2 TBq
D-value (НП-067-24)
0.1 TBq

Decay modes

  • isomeric transition → Y-91 — 100 %

Main gamma lines

Energy, keVYield, %
555.5794.96
14.958 · X-ray line1.72
14.883 · X-ray line0.8978

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

Related calculators

Decayगतिविधि ↔ द्रव्यमानSource categoryDose rateA1/A2 और package type

इसी element के अन्य isotopes

Y-90
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.

Yttrium-91m (Y-91m) — reference data

What is in the card

This card gathers the key data of radionuclide Y-91m 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 Y-91m 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.