Table 2.

Pu isotope ratios in pollution from different nuclear events.

240Pu/239Pu	Ratio	References
Spent fuel reprocessing	0.02–0.06	[13,14]
Weapons-grade	<0.06	[15]
Global fallout	0.176 ± 0.014	[16]
Fukushima	0.330–0.415	[17]
Chernobyl	0.4	[18]