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Nuclide reference

As-72 — Arsenic-72

The half-life of As-72 is 1.0833 d. Main decay mode: β⁺ decay / electron capture to Ge-72 (100%).

Identification

Element
Arsenic (As)
Atomic number Z
33
Mass number A
72
State
Radioactive

Key quantities

Half-life
1.0833 d
Specific activity
6.194e+16 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
0.3 TBq / 0.3 TBq
D-value (НП-067-24)
0.04 TBq

Decay modes

  • β⁺ decay / electron capture → Ge-72 — 100 %

Main gamma lines

Energy, keVYield, %
510.999 · annihilation 511 keV175.7
833.9981
629.928.068
9.887 · X-ray line3.776
9.856 · X-ray line1.945
1,4641.128
1,050.751.003
894.260.7898
2,105.90.648
1,475.90.516

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

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁺, E max2,50064.2
3,33416.3
1,8705.82
2,642.60.7

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

Related calculators

DecayActivity ↔ massSource categoryDose rateA1/A2 and 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 is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.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.

Arsenic-72 (As-72) — reference data

What is in the card

This card gathers the key data of radionuclide As-72 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 As-72 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.