Radionuclide

Detector

GE03

GE08

GE09

GE11

GE12

Th-234 (63.3 keV)

20.1 ± 4.9

20.4 ± 6.9

19.4 ± 7.5

21.6 ± 4.4

23.2 ± 3.7

U-238 (Pa-234m, 1001 keV)

26.2 ± 5.1

22.5 ± 5.8

19.7 ± 4.4

25.6 ± 5.6

25.4 ± 6.6

Pb-210 (46.54 keV)

ND*

ND*

ND*

24.2 ± 7.5

24.2 ± 3.8

Pb-214

23.3 ± 0.3

22.8 ± 0.3

23.1 ± 0.2

22.5 ± 0.3

23.3 ± 0.3

Bi-214

22.2 ± 0.3

21.8 ± 0.3

20.9 ± 0.2

21.8 ± 0.3

22.4 ± 0.2

Ra-228

23.0 ± 0.3

22.7 ± 0.3

22.9 ± 0.3

22.4 ± 0.3

23.2 ± 0.3

Pb-212

22.3 ± 0.4

22.9 ± 0.4

23.0 ± 0.4

22.1 ± 0.4

22.9 ± 0.5

Bi-212 (727.33 keV)

23.0 ± 1.1

23.0 ± 1.0

22.0 ± 0.8

21.1 ± 0.9

21.8 ± 0.9

Tl-208

22.3 ± 0.4

21.5 ± 0.4

22.1 ± 0.3

21.0 ± 0.4

22.1 ± 0.3

U-235 (143.76 keV; 163.33 keV; 205.31 keV)

1.18 ± 0.4

1.18 ± 0.4

1.12 ± 0.4

1.26 ± 0.4

1.39 ± 0.4

K-40 (1461 keV)

555 ± 11

557 ± 11

549 ± 11

556 ± 11

555 ± 11

Cs-137 (661.7 keV)

0.95 ± 0.05

0.89 ± 0.06

0.95 ± 0.05

0.92 ± 0.06

0.84 ± 0.06

U-series disequilibrium

0.99 ± 0.15

1.04 ± 0.21

1.10 ± 0.18

0.96 ± 0.14

0.94 ± 0.13

²³⁵U/²³⁸U activity ratio

0.052 ± 0.02

0.053 ± 0.02

0.052 ± 0.02

0.057 ± 0.02

0.062 ± 0.01