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Nuclide reference

Sn-113 — Tin-113

The half-life of Sn-113 is 115.09 d. Main decay mode: electron capture to In-113m (100%).

Identification

Element
Tin (Sn)
Atomic number Z
50
Mass number A
113
State
Radioactive

Key quantities

Half-life
115.09 d
Specific activity
3.715e+14 Bq/g
Gamma constant Γ
—
A1 / A2 for transport (SSR-6, НП-053-16)
4 TBq / 2 TBq
D-value (НП-067-24)
0.3 TBq

Decay modes

  • electron capture → In-113m — 100 %

Main gamma lines

Energy, keVYield, %
391.698 (In-113m)64.51
24.21 · X-ray line39.6
24.002 · X-ray line21.09
255.1342.11
638.030.00097

Includes daughter nuclides in equilibrium: In-113m (yield per decay of Sn-113); the emitting nuclide is in brackets. Equilibrium is reached in about 12 h.

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.

Tin-113 (Sn-113) — reference data

What is in the card

This card gathers the key data of radionuclide Sn-113 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 Sn-113 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.