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Alpha-Neutron Reaction Calculator

(last updated 21 Jan 2026)
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For educational purposes only. No warranty.

Calculate neutron production in uranium compounds, as caused from alpha-neutron reactions and from spontaneous fission.

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

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Material Input        HELP
InputTypeParameters

ng
µg
mg
g
kg
t
 U in/as

Bq U-238 in
Bq Unat in
 U
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         HELP
DelayResult Detail
none
1 year
10 years
100 years
1000 years
104 years
106 years
other: years
 Neutron production:
Total only
by Series
by Nuclides


 
        HELP      
 

Results


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The decay data is taken from ICRP-07 Data Files © A. Endo and K.F. Eckerman 2008, decay energies from ICRP38. The ion stopping powers were calculated with SRIM . The (a,n) neutron production cross sections are extracted from the JENDL-AN database.

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