. 2021 Oct 29;7(44):eabj1175. doi: 10.1126/sciadv.abj1175

Table 1. Isotope inventory of plutonium.

Integrated signal counts in the peak areas of the spectrum of Fig. 3 as measured, together with nonresonant background. Extracted ratios are compared to expected values from Makarova et al., sample 9 from table 7 including decay correction (39).

	²³⁸Pu	²³⁹Pu	²⁴⁰Pu	²⁴¹Pu	²⁴²Pu
Signal [measured counts]	396	68,084	36,148	2387	2636
Background [measured counts]	194	11	1	1	1
Rel. content [%] this work	0.22(3)*	57.2(2)	30.4(2)	10.0(2)*	2.21(4)
Rel. content [%] from (39)	0.288(6)	59.23(11)	30.12(6)	8.13(16)	2.23(5)
Mass [g/t_HWM] from (39)	12.8(2)	2290(30)	1165(12)	315(5)	86.1(2)

*Values were decay-corrected back to 26 April 1986.