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Uranium Decay Calculator

(last updated 23 Jan 2026)
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For optional graphical output, the browser must be HTML 5-capable.
For educational purposes only. No warranty.
The decay data is taken from ICRP-07 Data Files © A. Endo and K.F. Eckerman 2008

Calculate radioactive decay and ingrowth of uranium and its decay products for a variety of nuclide mixes found in the nuclear fuel industry.
Covers the natural U-238 and U-235 series, and the artificial U-236 and U-232 series.

Enter the parameters and click the "Calculate" button below. HELP
Numbers can be entered in exponential notation: 5 · 10^-6 = 5e-6
"t" means metric tonne.

Material Input

Input

Type

Parameters

ng
µg
mg
g
kg
t

U in/as

Bq U-238 in
Bq U_nat in
Bq Ra-226 in

ore
mill tailings

ore grade % U
mill loss %

U
UCl₄
UF₄
UF₆
UO₂
UO₂F₂
UO₂(NO₃)₂
UO₃
U₃O₈

natural uranium

	in equilibrium with progeny
	pure
	enriched to wt% U-235
	depleted to wt% U-235 (from enrichment to wt% U-235)

recycled uranium
burnup · initial enrichment:

(5 year storage time after unload)

	as is
	re-enriched to initial U-235 equivalent
	depleted to 0.2 wt% U-235

Output Parameters
Time Period	Chart Type	Chart Data	Chart Detail	Chart Axes
Chart Start Time * years Chart End Time years List Time ** years Mark list time in chart	no chart line chart stacked areas		totals of each decay series all individual nuclides individual nuclides for selected series: ** show total for selection * skip minor nuclides	log. Y axis *** Decades on log. Y axis: log. time axis

* log. time axis only ** or by mouse click *** line chart only **** multiple selections with CTRL-key

HELP

Results

(Click legend items to toggle specific curves on/off)

(... copy and paste ...)

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