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

Completed Sample Measurements for the Lively Detector

QBITS-CUTE Measurements:

Sample Description

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

QBITS-CUTE L01

49.6 g

13.534

220712
220720
220721
22072101

Jul 12, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Amumetal Shield

Jul 26, 2022

(mBq/kg)

<1.19

852.60

133.50

12.48

1.89

9.86

4.40

44.95

34.62

<2.35

<1.90

(ppm / ppb / ppt)

<96.39 ppt

69.06 ppb

10.81 ppb

21.96 ppb

3.33 ppb

2.43 ppb

1.08 ppb

1.45 ppm

1.12 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

57Co:

58Co:

(mBq/kg)

27642.00

16580.00

<17.85

1.84

1.59

15.15

7.44

13.74

3.92

4.03

1.82

(ppm / ppb / ppt)

2.24 ppm

1.34 ppm

3.73 ppb

1.83 ppb

QBITS-CUTE L02

126.1 g

8.742

220726
220728
220729
22072901

Jul 26, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Sample Holder

220731
220803

Aug 5, 2022

(mBq/kg)

1.20

1.26

59.16

24.16

1.31

0.50

6.85

1.60

30.96

13.67

<0.52

<1.08

(ppb or ppm)

0.1 ppb

4.79 ppb

1.96 ppb

2.3 ppb

0.88 ppb

1.68 ppb

0.39 ppb

1 ppm

0.44 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co:

58Co:

(mBq/kg)

<42384.00

<5.11

<0.76

7.56

2.64

0.62

0.87

<1.04

(ppb or ppm)

<3.43 ppm

1.86 ppb

0.65 ppb

QBITS-CUTE L03

593.3 g

9.381

220805
220807
220809
22081101
220813

Aug 5, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Aluminum Shield

220815
22081501
220816
220817

Aug 17, 2022

(mBq/kg)

6.18

1.17

6446.00

288.80

116.20

2.89

125.80

4.55

12.11

6.50

<1.55

0.18

0.34

(ppm / ppb / ppt)

0.5 ppb

0.09 ppb

522.13 ppb

23.39 ppb

204.51 ppb

5.08 ppb

30.95 ppb

1.12 ppb

390.99 ppb

209.98 ppb

Results:

210Pb:

7Be:

54Mn

228Ac:

57Co:

58Co:

(mBq/kg)

7346.10

840.50

6.38

6.26

1.79

0.66

113.20

5.42

<2.35

<1.03

(ppm / ppb / ppt)

595.03 ppb

68.08 ppb

27.85 ppb

1.33 ppb

QBITS-CUTE L04

7.2 g

14.554

22081701
220825

Aug 17, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Copper-Nickel Cables and Connectors

Sep 1, 2022

(mBq/kg)

<2.62

322.20

187.60

5.87

3.66

<21.48

<75.90

7.79

5.12

<2.54

(ppb or ppm)

<0.21 ppb

26.1 ppb

15.2 ppb

10.33 ppb

6.44 ppb

<5.28 ppb

<2.45 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co:

58Co:

(mBq/kg)

57731.00

17900.00

<65.84

<7.25

<38.28

<10.62

5.72

4.30

(ppb or ppm)

4.68 ppm

1.45 ppm

<9.42 ppb

QBITS-CUTE L05

Chalmers University of Technology

9.564 g

13.748

230411

Apr 11, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Wafer 4”

Apr 25, 2023

(mBq/kg)

<4.43

267.10

305.70

7.95

4.66

<16.87

85.36

111.40

<10.39

<5.87

(ppm / ppb / ppt)

<0.36 ppb

21.64 ppb

24.76 ppb

13.99 ppb

8.21 ppb

<4.15 ppb

2757.16 ppb

3598.22 ppb

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

90958.00

75010.00

<89.42

<7.10

<27.23

(ppm / ppb / ppt)

7.37 ppm

6.08 ppm

<6.7 ppb

QBITS-CUTE L06

Chalmers University of Technology

2.726 g

13.846

230425

Apr 25, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Wafer 2”
Type 011

May 9, 2023

(mBq/kg)

<11.90

308.20

405.40

7.66

10.19

<45.79

<290.20

<34.36

<8.02

(ppb or ppm)

<0.96 ppb

24.96 ppb

32.84 ppb

13.48 ppb

17.93 ppb

<11.26 ppb

<9.37 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<21840.00

<124.40

<21.01

<76.89

(ppb or ppm)

<1.77 ppm

<18.91 ppb

QBITS-CUTE L07

Chalmers University of Technology

2.677 g

12.026

230512

May 12, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Wafer 2”
Type 010

May 24, 2023

(mBq/kg)

<12.55

<516.80

<21.95

<28.49

<336.70

12.66

15.87

<18.35

(ppm / ppb / ppt)

<1.02 ppb

<41.86 ppb

<38.63 ppb

<7.01 ppb

<10.88 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

29123.00

22150.00

<198.00

<26.15

<118.70

(ppm / ppb / ppt)

2.36 ppm

1.79 ppm

<29.2 ppb

QBITS-CUTE L08

Chalmers University of Technology

2.69 g

12.777

231206
231209

Dec 6, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Wafer 2”
Type 12 231003

Sample #4

Dec 19, 2023

(mBq/kg)

<7.10

<601.70

<10.10

<20.53

166.44

298.60

<26.49

<4.34

Two Wafers:
12 231003 #01
12 231003 #13

(ppb or ppm)

<0.58 ppb

<48.74 ppb

<17.78 ppb

<5.05 ppb

5.38 ppm

9.64 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<1.558E4

167.50

119.80

<32.67

<171.60

(ppb or ppm)

<1.26 ppm

<42.21 ppb

QBITS-CUTE L09

Chalmers University of Technology

134.3 g

9.104

231219

Dec 19, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

PCB Al2O3

Sample #8-2

Dec 28, 2023

(mBq/kg)

1530.00

36.20

15460.00

732.80

299.90

8.45

810.80

26.67

835.20

76.00

<2.50

<4.33

(ppb or ppm)

123.93 ppb

2.93 ppb

1252.26 ppb

59.36 ppb

527.82 ppb

14.87 ppb

199.46 ppb

6.56 ppb

26.98 ppm

2.45 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<1688.00

<32.37

6.83

3.77

746.50

30.23

(ppb or ppm)

<136.73 ppb

183.64 ppb

7.44 ppb

QBITS-CUTE L10

Chalmers University of Technology

45.20 g

7.909

240117

Jan 17, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Copper Backed Circuit Board Plates

Sample #7-3

Jan 25, 2024

(mBq/kg)

1439.00

45.19

6641.00

489.00

129.60

8.46

2296.00

74.99

253.34

97.57

<12.29

<5.88

(ppb or ppm)

116.56 ppb

3.66 ppb

537.92 ppb

39.61 ppb

228.1 ppb

14.88 ppb

564.82 ppb

18.45 ppb

8.18 ppm

3.15 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<9088.00

104.70

70.47

12.26

8.93

2253.00

83.65

(ppb or ppm)

<736.13 ppb

554.24 ppb

20.58 ppb

In Progress Sample Measurements for the Lively Detector

Runs in Progress:

Sample Description

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)

(ppm / ppb / ppt)

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

(ppm / ppb / ppt)