सभी tools

Nuclide reference

Bk-249 — Berkelium-249

Bk-249 की half-life 320 d है। मुख्य decay mode: β⁻ decay → Cf-249 (100%)।

Identification

तत्व
Berkelium (Bk)
Atomic number Z
97
Mass number A
249
State
Radioactive

Key quantities

Half-life
320 d
विशिष्ट गतिविधि
6.063e+13 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
40 TBq / 0.3 TBq
D-value (НП-067-24)
10 TBq

Decay modes

  • β⁻ decay → Cf-249 — 100 %
  • α decay → Am-245 — 0.00145 %
  • spontaneous fission — 4.69e-8 %

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max124100

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।

Berkelium-249 (Bk-249) — reference data

What is in the card

This card gathers the key data of radionuclide Bk-249 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 Bk-249 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.