Nuclide reference

Hg-195m — Mercury-195m

Hg-195m की half-life 1.7333 d है। मुख्य decay mode: isomeric transition → Hg-195 (54.2%)।

Identification

तत्व
Mercury (Hg)
Atomic number Z
80
Mass number A
195
State
Radioactive

Key quantities

Half-life
1.7333 d
विशिष्ट गतिविधि
1.429e+16 Bq/g
Gamma constant Γ
—
परिवहन के लिए A1 / A2 (SSR-6)
3 TBq / 0.7 TBq
D-value (НП-067-24)
0.2 TBq

Decay modes

  • isomeric transition → Hg-195 — 54.2 %
  • β⁺ decay / electron capture → Au-195 — 45.8 %

Main gamma lines

Energy, keVYield, %
261.7531.31
68.807 · X-ray line16.53
9.97675 · X-ray line10.63
560.277.099
387.872.179
37.091.943
200.380.8022
1,241.170.6332
525.750.4969
207.10.3691

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

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁺, E max404.480.011

For β⁺ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.

Related calculators

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.

Mercury-195m (Hg-195m) — reference data

What is in the card

This card gathers the key data of radionuclide Hg-195m 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 Hg-195m 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.