Table 1.

Overview of the sample material used in the present study for ${}^{233}$U/${}^{236}$U analysis.

Sample description	Number of samples	Coordinates of sampling station	Sampling year	Time range covered	Predominant contamination source	${}^{236}$U/${}^{238}$U previous work	References
Irish Sea sediment core	7 (3–47) cm depth	54.416${}^{\circ }$N, 3.563${}^{\circ }$W	1993	–	Reprocessing plant Sellafield	(1.35 − 4.36)$\cdot$10${}^{-5}$	Srncik et al., Steier et al.14, 56
Irish Sea water IAEA-381(443)	1	54.415${}^{\circ }$N, 3.560${}^{\circ }$W - 54.387${}^{\circ }$N, 3.558${}^{\circ }$W	1993	–	Reprocessing plant Sellafield	(2.47 $\pm$ 0.19)$\cdot$10${}^{-6}$ (2.04 $\pm$ 0.02)$\cdot$10${}^{-6}$	Povinec et al., Pham et al.15,57 Eigl et al.3
Peat core, Blackforest Germany	23	48.718${}^{\circ }$N, 8.459${}^{\circ }$E	2006	1921–1992	Global fallout	(0.53 $\pm$ 0.09)$\cdot$10${}^{-6}$ to (7.40 $\pm$ 0.44)$\cdot$10${}^{-6}$	Quinto et al.37,38
Coral core, (Kume Island) Pacific Ocean Japan	31	26.319${}^{\circ }$N, 126.766 ${}^{\circ }$E	2014	1939–1970 annual resolution	Global fallout, tropospheric close-in fallout (PPG) by Castle (1954) & Hardtack I (1958)	(0.09 $\pm$ 0.01)$\cdot$10${}^{-9}$ to (11.0 $\pm$ 1.2)$\cdot$10${}^{-9}$	Nomura et al.40
Baltic Sea water, Kattegat, Denmark	2	56.57${}^{\circ }$N, 12.12${}^{\circ }$E 56.93${}^{\circ }$N, 12.20${}^{\circ }$E	2015	–	Global fallout, reprocessing plants La Hague & Sellafield, Chernobyl accident	–	–

PPG Pacific Proving Grounds.