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.

DAMIC Measurements:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

238U from 226Ra

238U from 234Th

235U

232Th

228Ac

137Cs

210Pb

Comments

DAMIC CW01

Epotek 301-2FL two-part epoxy

4.5 g

9.042

140318

Mar 18, 2014

(mBq/kg)

1.50

50.24

11.11

31.43

13.29

9.25

24.47

43.98

<63.49

<496.84

<269.47

Epoxy

Epoxy Technology, Billerica, Mass, USA

Also DAMIC 7

Mar 27, 2014

(ppb or ppm)

0.12 ppb

4.07 ppb

0.90 ppb

2.45 ppb

23.39 ppb

16.28 ppb

6.02 ppb

10.82 ppb

<15.62 ppb

DAMIC CW02

Ametek Engineered Materials SDN BHD

11.6 g

13.575

190513
190523
19052301
19052

May 13, 2019

(mBq/kg)

5.24

19.83

240.90

31.40

24.70

5.17

205.90

30.81

55.94

38.67

<161.40

92.46

50.45

40K:

<9865.00

Aluminum Rod (with 1% Silicon)

May 27, 2019

(ppb or ppm)

0.42 ppb

1.61 ppb

19.51 ppb

2.54 ppb

43.47 ppb

9.1 ppb

50.65 ppb

7.58 ppb

13.76 ppb

9.51 ppb

7.49 ppb

4.09 ppb

<318.64 ppm

DAMIC CW03

CENPA SS Lead

108.6 g

9.589

250310
230312
25031201
250313

Mar 10, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead Sample A1

Mar 21, 2025

(mBq/kg)

1.46

2.00

<193.10

<3.91

<3.90

9.86

30.36

<7.59

<1.45

(ppb or ppm)

0.12 ppb

0.16 ppb

<15.64 ppb

<6.88 ppb

<0.96 ppb

0.32 ppm

0.98 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

44339.00

4566.00

<13.47

<1.32

2.39

1.95

(ppb or ppm)

3.59 ppm

0.37 ppm

0.59 ppb

0.48 ppb

DAMIC CW04

CENPA SS Lead

108.8 g

9.645

250321

Mar 21, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead Sample B1

Mar 31, 2025

(mBq/kg)

0.93

1.93

<65.62

2.17

3.34

<2.30

32.49

30.89

<7.26

<2.57

(ppb or ppm)

0.08 ppb

0.16 ppb

<5.32 ppb

3.82 ppb

5.87 ppb

<0.57 ppb

1.05 ppm

1 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

57815.00

5254.00

<19.98

1.18

1.03

3.94

2.17

(ppb or ppm)

4.68 ppm

0.43 ppm

0.97 ppb

0.53 ppb

DAMIC CW05

CENPA SS Lead

108.3 g

8.822

250414
250416
250423

Apr 14, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead Sample C1

Apr 23, 2025

(mBq/kg)

<2.01

40.51

106.60

<8.53

<2.95

29.87

31.92

0.86

4.42

<2.49

(ppb or ppm)

<0.16 ppb

3.28 ppb

8.63 ppb

<15.01 ppb

<0.73 ppb

0.96 ppm

1.03 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

48633.00

4891.00

<10.76

<1.60

3.17

2.45

(ppb or ppm)

3.94 ppm

0.4 ppm

0.78 ppb

0.6 ppb

DAMIC CW06

CENPA SS Lead

108.5 g

8.573

25042301

Apr 23, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead Sample D1

May 2, 2025

(mBq/kg)

<5.08

11.28

91.32

2.46

3.33

<5.51

6.09

29.59

<6.64

<2.07

(ppb or ppm)

<0.41 ppb

0.91 ppb

7.4 ppb

4.34 ppb

5.87 ppb

<1.36 ppb

0.2 ppm

0.96 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

59911.00

5517.00

<26.30

<2.63

4.19

2.55

(ppb or ppm)

4.85 ppm

0.45 ppm

1.03 ppb

0.63 ppb

DAMIC CW07

Vishay Electro-Films

0.017 g

27.129

250815
250830

Aug 15, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Small Size Resistors

100 units

Sep 12, 2025

(mBq/kg)

<26910.00

<108200.00

243.80

731.40

244.50

2700.00

255070.00

1505000.00

<38210.00

<31570.00

(ppb or ppm)

<2.18 ppm

<8.76 ppm

429.09 ppb

1287.26 ppb

0.06 ppm

0.66 ppm

8238.76 ppm

48611.5 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<144440.00

5703.60

35980.00

<46500.00

132.40

27950.00

(ppb or ppm)

<11.7 ppm

0.03 ppm

6.88 ppm

DAMIC CW08

Vishay CTR, thin film center-tapped resistor

0.039 g

11.037

250923
250926
250928

Sep 23, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Large Size Resistors

250930
251001
251002

Oct 7, 2025

(mBq/kg)

<1709.00

<9418.00

221.20

253.40

<2013.00

118810.00

84690.00

<11400.00

<3416.00

(ppb or ppm)

<0.14 ppm

<0.76 ppm

389.31 ppb

445.98 ppb

<495.2 ppb

3837.56 ppm

2735.49 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<69360.00

<8166.00

<1986.00

324.70

3521.00

(ppb or ppm)

<5.62 ppm

79.88 ppb

866.17 ppb

DAMIC CW09

Linear Systems LSJ689

0.027 g

10.513

250912
250916
250917

Sep 12, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

JFETs

100 units

Sep 23, 2025

(mBq/kg)

<2138.00

<12450.00

<662.90

<3106.00

102190.00

109100.00

<17140.00

3271.00

4252.00

(ppb or ppm)

<0.17 ppm

<1.01 ppm

<1166.7 ppb

<764.08 ppb

3300.74 ppm

3523.93 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<130900.00

15051.00

11930.00

1271.80

2983.00

<7288.00

(ppb or ppm)

<10.6 ppm

<1792.85 ppb

DAMIC CW10

Cowie Technologies Group Inc.

7.891 g

12.827

251118
251123
251127

Nov 18, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

1 mL Cowie Bottle

Dec 2, 0025

(mBq/kg)

<3.83

<39.80

<1.44

<4.22

71.83

289.70

<55.17

<24.86

(ppb or ppm)

<0.31 ppb

<3.22 ppb

<2.53 ppb

<1.04 ppb

2.32 ppm

9.36 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<287.70

32.48

35.32

<13.73

12.34

15.82

(ppb or ppm)

<23.3 ppb

3.04 ppb

3.89 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)