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Nuclide reference

Pm-148m — Promethium-148m

Pm-148m की half-life 41.29 d है। मुख्य decay mode: β⁻ decay → Sm-148 (95.8%)।

Identification

तत्व
Promethium (Pm)
Atomic number Z
61
Mass number A
148
State
Radioactive

Key quantities

Half-life
41.29 d
विशिष्ट गतिविधि
7.906e+14 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
0.8 TBq / 0.7 TBq
D-value (НП-067-24)
0.03 TBq

Decay modes

  • β⁻ decay → Sm-148 — 95.8 %
  • isomeric transition → Pm-148 — 4.2 %

Main gamma lines

Energy, keVYield, %
550.2794.87
629.9789
725.732.84
1,013.8120.28
414.0718.66
915.3317.17
288.1112.56
599.7412.54
501.266.746
611.265.482

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

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max411.8554.61
699.9622.13
510.3317.63
2,470 (Pm-148)2.679

For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0. Includes daughter nuclides in equilibrium: Pm-148 (yield per decay of Pm-148m); the emitting nuclide is in brackets. Equilibrium is reached in about 43 d.

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।

Promethium-148m (Pm-148m) — reference data

What is in the card

This card gathers the key data of radionuclide Pm-148m 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 Pm-148m 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.