Some Useful Information Concerning the results:

The Conversion factors for the primordial nuclides are given by:

1 Bq 238U/kg = 81 ppb U (81 x 10-9 gU/g)

The 238U decay chain gammas used are:

234Th: 63.29 and 92.59 keV
226Ra: 186.1 keV

214Pb: 295.21 and 351.92 keV

214Bi: 609.31, 1120.29, 1764.49 and 2204.21 keV

The relationships are valid for any daughters in the 238U, 235U or 232Th chain only if the chain is in equilibrium.

1 Bq 232Th/kg = 246 ppb Th (246 x 10-9 gTh/g)

The 232Th decay chain gammas used are:

212Pb: 238.63 and 300.09 keV

208Tl: 277.371, 583.19, 860.557 and 2614.53 keV,

228Ac: 209.253, 338.320, 463,004, 911.21, 964.766 and 968.971 keV

1 Bq 40K/kg = 32300 ppb K (32300 x 10-6 gK/g)

The 40K decay chain gamma used is:

40K: 1460.83 keV

1 Bq 235U/kg = 1.76 ppm U (1.76 x 10-6 gU/g)

The 235U decay chain gammas used are:

235U: 143.76, 163.33 and 205.31 keV

The measurements of the samples below take into account the background measurements from the background table.
If a measurement is below the background then the upper bound shown is the 90% confidence limit.

QBITS-CUTE Measurements:

QBITS-CUTE 01

Homemade IR filters (CNTs)

68.8 g

13.408

220712
220720
220721
22072101

Jul 12, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

IR Filter

3 Pieces

Jul 26, 2022

(mBq/kg)

3.53

1.61

193.30

37.37

5.38

0.61

9.63

2.04

57.84

34.61

<0.89

<3.62

(ppb or ppm)

0.29 ppb

0.13 ppb

15.66 ppb

3.03 ppb

9.47 ppb

1.07 ppb

2.37 ppb

0.5 ppb

1.87 ppm

1.12 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

(mBq/kg)

753.24

876.40

0.87

0.59

<0.15

11.46

3.13

<0.063

<0.34

(ppb or ppm)

61.01 ppb

70.99 ppb

2.82 ppb

0.77 ppb

QBITS-CUTE 02

6.2 g

8.708

220726
220728
220729
22072901

Jul 26, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

NbTI Coaxial Cable with Connectors

220731
220803

Aug 5, 2022

(mBq/kg)

56.60

13.82

17470.00

1043.00

352.20

13.31

509.40

33.78

137.77

146.40

<58.40

<9.25

(ppb or ppm)

4.58 ppb

1.12 ppb

1415.07 ppb

84.48 ppb

619.87 ppb

23.43 ppb

125.31 ppb

8.31 ppb

4.45 ppm

4.73 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

11055.00

4231.00

<150.20

<16.52

527.00

49.22

(ppb or ppm)

895.46 ppb

342.71 ppb

129.64 ppb

12.11 ppb

QBITS-CUTE CW03

10.0 g

6.711

230210

Feb 10, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Used Sample Holder Circuit Boards

5 Units

Feb 17, 2023

(mBq/kg)

270.40

18.18

419.30

94.71

15.22

2.70

220.50

18.03

3593.40

686.70

<39.71

9.72

15.07

(ppb or ppm)

21.9 ppb

1.47 ppb

33.96 ppb

7.67 ppb

26.79 ppb

4.75 ppb

54.24 ppb

4.44 ppb

116.07 ppm

22.18 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

1610.10

717.70

<42.98

<15.71

200.90

26.82

(ppb or ppm)

130.42 ppb

58.13 ppb

49.42 ppb

6.6 ppb

QBITS-CUTE CW04

10.7 g

6.866

230217

Feb 17, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

New Sample Holder Circuit Boards

5 Units

Feb 24, 2023

(mBq/kg)

241.60

16.41

459.10

83.62

11.70

2.48

208.70

16.62

1802.20

517.10

<40.46

<25.22

(ppb or ppm)

19.57 ppb

1.33 ppb

37.19 ppb

6.77 ppb

20.59 ppb

4.36 ppb

51.34 ppb

4.09 ppb

58.21 ppm

16.7 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<984.90

47.63

40.28

<13.69

174.60

24.30

(ppb or ppm)

<79.78 ppb

42.95 ppb

5.98 ppb

QBITS-CUTE CW05

Kurt-J Lesker (99.999% Pure)

4.246 g

6.759

230224
230228

Feb 24, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Aluminum Pellets (New)

Mar 3, 2023

(mBq/kg)

<13.58

<133.00

<6.66

16.20

13.42

<754.90

<90.26

<12.60

(ppb or ppm)

<1.1 ppb

<10.77 ppb

<11.72 ppb

3.99 ppb

3.3 ppb

<24.38 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

24Na

(mBq/kg)

<967.10

<128.60

<15.93

41.26

18.96

9.16

4.55

<16.20

<38.64

(ppb or ppm)

<78.34 ppb

10.15 ppb

4.66 ppb

QBITS-CUTE CW06

Alfa Aeser Puratonics (99.999% Pure)

1.97 g

13.031

230303
230314

Mar 3, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Aluminum Slugs (New)

Mar 17, 2023

(mBq/kg)

<17.31

<131.90

<7.83

<18.91

1780.10

962.00

<209.00

<38.08

(ppb or ppm)

<1.4 ppb

<10.68 ppb

<13.78 ppb

<4.65 ppb

57.5 ppm

31.07 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

24Na

(mBq/kg)

<1762.00

<160.60

<37.99

53.61

43.65

<15.02

<27.79

<47.76

(ppb or ppm)

<142.72 ppb

13.19 ppb

10.74 ppb

QBITS-CUTE CW07

Kurt-J Lesker (99.995% Pure)

2.66 g

10.704

230317

Mar 17, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Titanium Pellets (New)

Mar 28, 2023

(mBq/kg)

21.97

20.06

<154.40

5.00

4.34

<23.08

<1538.00

<129.80

<72.47

(ppb or ppm)

1.78 ppb

1.62 ppb

<12.51 ppb

8.8 ppb

7.63 ppb

<5.68 ppb

<49.68 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<2802.00

<137.70

<45.93

<47.48

(ppb or ppm)

<226.96 ppb

<11.68 ppb

QBITS-CUTE CW08

Chalmers University of Technology

4.806 g

6.866

230328

Mar 28, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Tin Plated Printed Circuit Boards

Apr 4, 2023

(mBq/kg)

5386.00

191.30

9544.00

688.60

304.20

16.54

6481.00

250.10

7503.00

1695.00

<70.62

<69.07

13 units

(ppb or ppm)

436.27 ppb

15.5 ppb

773.06 ppb

55.78 ppb

535.39 ppb

29.11 ppb

1594.33 ppb

61.52 ppb

242.35 ppm

54.75 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

3163.10

1665.00

<376.80

199.85

78.96

6254.00

253.10

(ppb or ppm)

256.21 ppb

134.87 ppb

1538.48 ppb

62.26 ppb

QBITS-CUTE CW09

Chalmers University of Technology

12.9568 g

6.812

231129

Nov 29, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

IR Filter from Bluefors

Dec 6, 2023

(mBq/kg)

<8.66

1459.00

216.50

28.91

3.36

20.58

9.11

505.53

297.60

<40.70

<20.96

Sample #2

(ppb or ppm)

<0.7 ppb

118.18 ppb

17.54 ppb

50.88 ppb

5.92 ppb

5.06 ppb

2.24 ppb

16.33 ppm

9.61 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

77515.00

5479.00

<55.55

8.86

9.63

23.51

13.18

(ppb or ppm)

6.28 ppm

0.44 ppm

5.78 ppb

3.24 ppb

QBITS-CUTE CW10

Chalmers University of Technology

5.092 g

5.843

231206
231209

Dec 6, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Screws M2

Brass screws small 16 units Skruvcenter

Dec 12, 2023

(mBq/kg)

<14.96

<62.19

<6.64

<11.83

391.51

525.70

<79.64

27.71

28.12

Sample #5
16 units

(ppb or ppm)

<1.21 ppb

<5.04 ppb

<11.69 ppb

<2.91 ppb

12.65 ppm

16.98 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<603.70

<146.40

<15.44

<30.20

(ppb or ppm)

<48.9 ppb

<7.43 ppb

QBITS-CUTE CW11

Chalmers University of Technology

0.584 g

6.860

231212

Dec 12, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

PCB Circuits

AlOx Tin plated PCB from CERcuits

Dec 19, 2023

(mBq/kg)

3337.00

276.70

8104.00

1197.00

189.50

41.39

6149.00

407.20

14077.00

7897.00

<679.10

<469.20

Sample #6

(ppb or ppm)

270.3 ppb

22.41 ppb

656.42 ppb

96.96 ppb

333.52 ppb

72.85 ppb

1512.65 ppb

100.17 ppb

454.69 ppm

255.07 ppm

2 Units

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<4672.00

984.92

946.92

<228.90

4253.00

573.20

(ppb or ppm)

<378.43 ppb

1046.24 ppb

141.01 ppb

QBITS-CUTE CW12

Chalmers University of Technology

1.506 g

9.007

231219

Dec 19, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Circuit Boards

PCB from CIRcuits

Dec 28, 2023

(mBq/kg)

3144.00

161.80

6719.00

604.50

215.90

21.15

5079.00

256.10

2901.80

2820.00

<323.40

<153.20

Sample #8-1

(ppb or ppm)

254.66 ppb

13.11 ppb

544.24 ppb

48.96 ppb

379.98 ppb

37.22 ppb

1249.43 ppb

63 ppb

93.73 ppm

91.09 ppm

5 Units

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

1439.30

1707.00

<335.30

132.08

109.00

4354.00

307.10

(ppb or ppm)

116.58 ppb

138.27 ppb

1071.08 ppb

75.55 ppb

QBITS-CUTE CW13

U Waterloo Group

23.237 g

6.805

240809

Aug 9, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

SMA Connectors

(10 units)

Aug 16, 2024

(mBq/kg)

<3.79

96.71

41.83

5.64

1.37

1.18

3.94

91.68

99.82

0.60

11.42

1.96

5.25

(ppb or ppm)

<0.31 ppb

7.83 ppb

3.39 ppb

9.92 ppb

2.42 ppb

0.29 ppb

0.97 ppb

2.96 ppm

3.22 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

6922.00

407.50

27.60

20.78

1.31

3.70

6.32

6.35

(ppb or ppm)

560.68 ppb

33.01 ppb

1.56 ppb

QBITS-CUTE CW14

U Waterloo Group

0.048 g

13.431

240816

Aug 16, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

SMA Pins

Aug 30, 2024

(mBq/kg)

488.40

953.00

34510.00

10310.00

895.20

254.60

1688.00

1006.00

52452.00

43130.00

<8141.00

<1505.00

(ppb or ppm)

39.56 ppb

77.19 ppb

2795.31 ppb

835.11 ppb

1575.55 ppb

448.1 ppb

415.25 ppb

247.48 ppb

1694.2 ppm

1393.1 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<55050.00

2565.50

5676.00

<882.50

<2711.00

(ppb or ppm)

<4.46 ppm

<666.91 ppb

QBITS-CUTE CW15

U Waterloo Group

0.068 g

16.627

24083002

Aug 30, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

SMA PTFE

Sep 16, 2024

(mBq/kg)

<476.40

<4004.00

50.78

117.60

<933.70

26711.00

25970.00

<5595.00

<902.20

(ppb or ppm)

<38.59 ppb

<324.32 ppb

89.37 ppb

206.98 ppb

<229.69 ppb

862.77 ppm

838.83 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

4902.90

32940.00

5043.80

4088.00

<896.80

1573.00

1234.00

(ppb or ppm)

397.13 ppb

2668.14 ppb

386.96 ppb

303.56 ppb

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

Next Sample

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

(mBq/kg)

(ppb or ppm)

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

(ppb or ppm)