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Nuclide reference

Te-131m — Tellurium-131m

Te-131m की half-life 1.3854 d है। मुख्य decay mode: β⁻ decay → I-131 (74.1%)।

Identification

तत्व
Tellurium (Te)
Atomic number Z
52
Mass number A
131
State
Radioactive

Key quantities

Half-life
1.3854 d
विशिष्ट गतिविधि
2.662e+16 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
0.7 TBq / 0.5 TBq
D-value (НП-067-24)
0.04 TBq

Decay modes

  • β⁻ decay → I-131 — 74.1 %
  • isomeric transition → Te-131 — 25.9 %

Main gamma lines

Energy, keVYield, %
773.6736.82
852.2120.28
149.716 (Te-131)18.05
793.7513.37
1,125.4611.02
1,206.69.411
334.279.225
27.472 · X-ray line7.921
102.067.656
782.497.507

Includes daughter nuclides in equilibrium: Te-131 (yield per decay of Te-131m); the emitting nuclide is in brackets. Equilibrium is reached in about 3 h.

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max436.8935.21
518.0215.84
2,083.1 (Te-131)15.55
1,630.8 (Te-131)5.676

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.

Tellurium-131m (Te-131m) — reference data

What is in the card

This card gathers the key data of radionuclide Te-131m 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 Te-131m 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.