Neutron Production Thresholds

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Target	Threshold (MeV)	Cross Section
Carbon	18.72
Silicon	8.45
Lead	7.05	50 mbarns at[math] E_{gamma}[/math]=8 MeV
Aluminum	13.1	2 mbarns at[math] E_{gamma}[/math]=15 MeV
Nitrogen	10.50
Copper	9.85
Oxygen	15.67
Iron	11.20
Deuterium	2.225	1 mbarns at[math] E_{gamma}[/math]=8 MeV