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Nuclide reference

Rn-219 — Radon-219

The half-life of Rn-219 is 3.96 s. Main decay mode: α decay to Po-215 (100%).

Identification

Element
Radon (Rn)
Atomic number Z
86
Mass number A
219
State
Radioactive

Key quantities

Half-life
3.96 s
Specific activity
4.813e+20 Bq/g
Gamma constant Γ
—
D-value (НП-067-24)
—

Decay modes

Main gamma lines

Energy, keVYield, %
271.2310.8
401.816.588
79.291 · X-ray line0.894
76.864 · X-ray line0.5371
130.60.1296
293.560.07344
438.9 (Po-215)0.06003
517.60.04428
676.660.01728
608.30.00432

Includes daughter nuclides in equilibrium: Po-215 (yield per decay of Rn-219); the emitting nuclide is in brackets. Equilibrium is reached in about 0.012 s.

Alpha and beta particles

RadiationEnergy, keVYield, %
α6,819.179.4
6,552.612.9
6,4257.5
7,386.1 (Po-215)99.98

Related calculators

DecayActivity ↔ massDose rate

Other isotopes of this element

Rn-222
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.

Radon-219 (Rn-219) — reference data

What is in the card

This card gathers the key data of radionuclide Rn-219 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 Rn-219 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.