Table 4.

Measured activities of radioactive isotopes in some materials that were rejected. Measured values are given with $\pm 1\sigma$ uncertainties, and upper limits are set at 95% C.L. The facility, sample mass, and lifetime are provided for each measurement (as applicable)

Sample	Component	Manufacturer	Facility	Mass [kg]	Livetime [d]	Units	${}^{238}$U	${}^{235}$U	${}^{226}$Ra	${}^{228}$Ra (${}^{232}$Th)	${}^{228}$Th	${}^{40}$K	${}^{60}$Co	${}^{137}$Cs
R0	SS304	Nironit	GeMPI	8.8	17.5	mBq/kg	$<21$	$<0.8$	1.7(2)	1.1(3)	1.2(2)	$<3.0$	0.8(1)	$<0.2$
R0	SS304	Nironit	ICP-MS	–	–	mBq/kg	3.7(5)	–	–	0.5(1)	–	–	–	–
R1	SS20	Terni	GeMPI	10.3	12.3	mBq/kg	$<24$	$<1.2$	$<69$	2.1(4)	7.1(6)	1.3(6)	14(1)	$<0.2$
R1	SS20	Terni	ICP-MS	–	–	mBq/kg	4.5(8)	–	–	5.0(8)	–	–	–	–
R2	SS27	Terni	GeMPI	7.2	16.6	mBq/kg	$<40$	$<1.4$	$<0.6$	$<1.1$	2.1(4)	$<1.4$	23(2)	$<0.2$
R2	SS27	Terni	ICP-MS	–	–	mBq/kg	15(3)	–	–	1.4(2)	–	–	–	–
R3	SS304	Nironit	GeMPI	8.0	13.8	mBq/kg	$<11$	$<0.9$	2.0(2)	2.2(3)	5.4(4)	1.7(5)	0.31(5)	$<0.1$
R3	SS304	Nironit	ICP-MS	–	–	mBq/kg	3.5(6)	–	–	3(1)	–	–	–	–