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Nuclide reference

Bi-211 — Bismuth-211

Bi-211 की half-life 2.14 min है। मुख्य decay mode: α decay → Tl-207 (99.72%)।

Identification

तत्व
Bismuth (Bi)
Atomic number Z
83
Mass number A
211
State
Radioactive

Key quantities

Half-life
2.14 min
विशिष्ट गतिविधि
1.541e+19 Bq/g
Gamma constant Γ
—
D-value (НП-067-24)
—

Decay modes

  • α decay → Tl-207 — 99.72 %
  • β⁻ decay → Po-211 — 0.276 %

Main gamma lines

Energy, keVYield, %
351.0713.02
72.874 · X-ray line1.227
70.833 · X-ray line0.7275

Lines of the nuclide itself (ENDF/B-VIII.0).

Alpha and beta particles

RadiationEnergy, keVYield, %
α6,622.983.54
6,278.216.19
7,450.3 (Po-211)0.2741
β⁻, E max5740.276

For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0. Includes daughter nuclides in equilibrium: Po-211 (yield per decay of Bi-211); the emitting nuclide is in brackets. Equilibrium is reached in about 3.6 s.

Related calculators

Decayगतिविधि ↔ द्रव्यमानDose rate

इसी element के अन्य isotopes

Bi-213
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.

Bismuth-211 (Bi-211) — reference data

What is in the card

This card gathers the key data of radionuclide Bi-211 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 Bi-211 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.