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










In Progress and To Be Measured:




























Sample Description Manufacturer Mass (g) Live Time (days) Run Numbers Counting Dates
(if applicable)






















DAMIC CW06 CENPA SS Lead 108.5 g 4.217 25042301 Apr 23, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Lead Sample D1




(mBq/kg) <4.96

23.98 +- 137.00 2.85 +- 4.75 <8.52

59.61 +- 51.00 <5.87

<2.27








(ppb or ppm) <0.4 ppb

1.94 ppb +- 11.1 ppb 5.01 ppb +- 8.36 ppb <2.1 ppb

1.93 ppm +- 1.65 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 30180.00 +- 6698.00 <33.26

<2.21

9.33 +- 4.24















(ppb or ppm) 2.44 ppm +- 0.54 ppm





2.3 ppb +- 1.04 ppb










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)