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.

PICO 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

PICO CW01

Small Diameter Piezos from December Production

10.6 g

15.532

140107
14010701
14010703
14010801
14010802
14010804
140115

Jan 7, 2014

(mBq/kg)

1360.17

68.28

5.35

45.45

21.55

3.76

242.89

28.02

141.82

82.07

<63.85

1783.02

103.77

Piezo Acoustic Sensors

Also PICO 3

Jan 23, 2014

(ppb or ppm)

110.17 ppb

5.53 ppb

0.43 ppb

3.68 ppb

37.94 ppb

6.62 ppb

59.75 ppb

6.89 ppb

34.89 ppb

20.19 ppb

PICO CW02

14.8 g

8.528

140617

Jun 17, 2014

(mBq/kg)

30.86

25.73

<15.05

4.44

5.90

126.66

20.01

17.82

44.79

<118.15

513.51

60.81

Small Diameter Piezo Acoustic Sensors (11)

May/June 2014 Production (6/16/2014)

Also PICO 10

Jun 26, 2014

(ppb or ppm)

2.50 ppb

2.08 ppb

1.22 ppb

7.82 ppb

10.39 ppb

31.26 ppb

4.92 ppb

4.38 ppb

11.02 ppb

PICO CW03

These piezos are unelectroded

10.6 g

5.958

140626

Jun 26, 2014

(mBq/kg)

<49.93

2.83

17.90

6.13

8.26

10.11

18.75

119.25

74.03

<331.87

528.30

84.91

Small Diameter Piezo Acoustic Sensors (8)

May/June 2014 Production (6/16/2014)

Jul 2, 2014

(ppb or ppm)

<3.48 ppb

0.23 ppb

1.45 ppb

10.79 ppb

14.53 ppb

2.49 ppb

4.61 ppb

29.34 ppb

18.21 ppb

PICO CW04

4.0 g

5.924

140702

Jul 2, 2014

(mBq/kg)

111.38

78.54

32.69

41.60

25.51

12.07

45.78

49.62

25.96

155.38

<632.00

75.00

125.00

Distilled LAB

Jul 8, 2014

(ppb or ppm)

9.02 ppb

6.36 ppb

2.65 ppb

3.37 ppb

44.89 ppb

21.34 ppb

11.26 ppb

12.21 ppb

6.39 ppb

38.22 ppb

PICO CW05

Blue

19.2 g

2.861

150514

May 14, 2015

(mBq/kg)

781.91

103.06

867.09

95.40

80.07

16.50

2870.07

173.14

1325.25

166.50

<453.85

703.28

180.47

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 17, 2015

(ppb or ppm)

63.34 ppb

8.35 ppb

70.24 ppb

7.72 ppb

140.93 ppb

29.04 ppb

706.04 ppb

42.59 ppb

326.01 ppb

40.96 ppb

56.97 ppb

14.62 ppb

PICO CW06

White

19.3 g

2.979

150517

May 17, 2015

(mBq/kg)

696.45

94.88

869.44

98.12

95.459

16.574

2896.71

178.27

1511.97

171.32

<599.22

758.17

177.67

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 20, 2015

(ppb or ppm)

56.41 ppb

7.69 ppb

70.42 ppb

7.95 ppb

168.01 ppb

29.17 ppb

712.59 ppb

43.85 ppb

371.95 ppb

42.15 ppb

61.49 ppb

14.39 ppb

PICO CW07

Orange

20.0 g

2.049

150520

May 20, 2015

(mBq/kg)

910.61

108.62

644.84

104.65

75.16

18.82

2869.19

185.90

1609.232

202.302

<725.80

1236.80

214.70

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 22, 2015

(ppb or ppm)

73.76 ppb

8.80 ppb

52.23 ppb

8.58 ppb

132.27 ppb

33.12 ppb

705.82 ppb

45.73 ppb

395.87 ppb

49.77 ppb

100.18 ppb

17.39 ppb

PICO CW08

Red

18.9 g

2.826

150522

May 22, 2015

(mBq/kg)

650.44

83.78

608.42

69.84

65.69

13.53

1288.59

98.35

596.94

118.58

<645.29

1521.53

182.59

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 25, 2015

(ppb or ppm)

52.69 ppb

6.79 ppb

49.28 ppb

5.66 ppb

115.61 ppb

23.82 ppb

316.99 ppb

24.20 ppb

146.85 ppb

29.17 ppb

123.24 ppb

14.79 ppb

PICO CW09

Green

19.1 g

2.000

150525
150527

May 25, 2015

(mBq/kg)

1118.86

134.80

990.36

118.13

176.697

23.426

2540.17

178.12

771.02

185.84

<778.59

2101.47

274.97

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 27, 2015

(ppb or ppm)

90.63 ppb

10.92 ppb

80.22 ppb

9.57 ppb

310.99 ppb

41.23 ppb

624.88 ppb

43.82 ppb

189.67 ppb

45.72 ppb

170.22 ppb

22.27 ppb

PICO CW10

Black

19.0 g

1.979

15052701

May 27, 2015

(mBq/kg)

885.12

121.20

956.87

111.45

94.44

19.79

2675.29

180.31

1273.23

194.82

<790.95

1561.05

232.79

PVC-Clad Wire (Hook up wire)

Alpha Wire

May 29, 2015

(ppb or ppm)

71.70 ppb

9.82 ppb

77.51 ppb

9.03 ppb

166.21 ppb

34.82 ppb

658.12 ppb

44.36 ppb

313.22 ppb

47.93 ppb

126.44 ppb

18.86 ppb

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

PICO CW11

Brown

19.0 g

9.847

150529
150530

May 29, 2015

(mBq/kg)

668.42

53.16

778.88

67.50

82.64

9.59

2454.28

134.92

1311.82

98.36

<229.05

925.21

107.26

PVC-Clad Wire (Hook up wire)

Alpha Wire

Jun 8, 2015

(ppb or ppm)

54.14 ppb

4.31 ppb

62.85 ppb

5.47 ppb

145.44 ppb

16.88 ppb

603.875 ppb

33.19 ppb

322.71 ppb

24.20 ppb

74.94 ppb

8.69 ppb

PICO CW12

3.3 g

4.069

150608

Jun 8, 2015

(mBq/kg)

90.69

114.30

<77.89

<30.00

96.05

65.48

<386.36

<2556.67

2428.49

362.12

Cable Inner Wires

ECOGen Cables by Alpha Wire

Jun 12, 2015

(ppb or ppm)

7.35 ppb

9.26 ppb

<6.31 ppb

<52.80 ppb

23.63 ppb

16.11 ppb

<95.05 ppb

196.71 ppb

29.33 ppb

PICO CW13

Grey plastic-type outer shell

3.6 g

4.883

150612

Jun 12, 2015

(mBq/kg)

1624.35

236.32

995.10

171.71

116.81

32.07

2634.55

233.45

1577.03

309.68

440.83

1217.50

1845.56

393.89

Cable Outer Shield

ECOGen Cables by Alpha Wire

Jun 17, 2015

(ppb or ppm)

131.57 ppb

19.14 ppb

80.60 ppb

13.91 ppb

205.60 ppb

56.45 ppb

648.10 ppb

57.43 ppb

387.95 ppb

76.18 ppb

149.49 ppb

31.91 ppb

PICO CW14

Metal Insulator / Grounding Jacket

5.4 g

5.542

150617
150618
15061801
150619

Jun 17, 2015

(mBq/kg)

32.00

69.06

487.74

71.16

54.83

13.48

99.56

39.39

113.11

90.77

<1142..04

938.89

179.07

Cable Outer insulator

ECOGen Cables by Alpha Wire

Jun 23, 2015

(ppb or ppm)

2.59 ppb

5.59 ppb

39.51 ppb

5.76 ppb

96.50 ppb

23.73 ppb

24.49 ppb

9.69 ppb

27.82 ppb

22.33 ppb

76.05 ppb

14.51 ppb

PICO CW15

4.6 g

4.861

150623

Jun 23, 2015

(mBq/kg)

252.39

86.21

60.32

49.54

31.194

14.290

184.43

58.69

25.09

117.58

<1531.52

516.09

171.52

Thick Diameter Cable Inner Wire

ECOGen Cables by Alpha Wire

Jun 28, 2015

(ppb or ppm)

20.44 ppb

6.98 ppb

4.89 ppb

4.01 ppb

54.90 ppb

25.12 ppb

45.37 ppb

14.44 ppb

6.17 ppb

28.92 ppb

41.80 ppb

13.89 ppb

PICO CW16

6.1 g

6.000

150702

Jul 2, 2015

(mBq/kg)

24.13

48.57

171.68

45.23

31.67

10.48

<48.69

<116.72

<932.46

7896.07

535.57

Thick Diameter Cable Outer insulator

ECOGen Cables by Alpha Wire

Jul 8, 2015

(ppb or ppm)

1.96 ppb

3.93 ppb

13.91 ppb

3.66 ppb

55.73 ppb

18.45 ppb

<11.98 ppb

<28.71 ppb

639.58 ppb

43.38 ppb

PICO CW17

15.8 g

3.875

150628

Jun 28, 2015

(mBq/kg)

151.77

38.00

68.36

25.23

20.28

4.41

94.18

21.74

<258.92

<561.14

639.18

101.58

Thick Diameter Cable Outer Shield

ECOGen Cables by Alpha Wire

Jul 2, 2015

(ppb or ppm)

12.29 ppb

3.10 ppb

5.54 ppb

2.04 ppb

35.69 ppb

7.76 ppb

23.17 ppb

5.35 ppb

<63.70 ppb

51.77 ppb

8.23 ppb

PICO CW18

Part No. A06000320625S

5.3 g

6.910

160317
16031701

Mar 17, 2016

(mBq/kg)

33.43

48.23

8.35

28.50

16.44

8.95

<47.17

10.52

81.17

<929.62

41.13

101.70

Springs

Lot No. 1076186
Associated Spring Raymond

Mar 24, 2016

(ppb or ppm)

2.71 ppb

3.91 ppb

0.68 ppb

2.31 ppb

28.93 ppb

15.75 ppb

<11.60 ppb

2.59 ppb

19.97 ppb

3.33 ppb

8.24 ppb

PICO CW19

Lot No.: 286245-6
8-32 x ½ washer face thumb screw

17.10 g

6.924

160324

Mar 24, 2016

(mBq/kg)

<13.18

13.50

9.73

1.18

2.51

<9.94

52.96

26.09

<244.74

67.05

29.83

Thumb Screws

Richard Manno Company

Mar 31, 2016

(ppb or ppm)

<1.07 ppb

1.09 ppb

0.79 ppb

2.08 ppb

4.41 ppb

<2.45 ppb

13.03 ppb

6.42 ppb

5.43 ppb

2.42 ppb

PICO CW20

0.5 g

12.794

160923
160930

Sep 23, 2016

(mBq)

440.19

405.63

118.15

201.17

43.19

62.33

<380.00

198.07

567.44

<5240.00

1882.00

716.00

Kapton

Oct 6, 2016

(ppb or ppm)

35.66 ppb

32.86 ppb

9.57 ppb

16.30 ppb

76.02 ppb

109.70 ppb

<93.48 ppb

73.33 ppb

139.59 ppb

155.44 ppb

58.00 ppb

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

PICO CW21

0.4 g

10.306

161006
161010

Oct 6, 2016

(mBq/kg)

<525.00

<289.41

23.505

84.480

116.07

337.23

<4210.00

<7052.50

1705.00

962.50

Liquid Crystal Polymer

Oct 17, 2016

(ppb or ppm)

<42.53 ppb

<23.44 ppb

41.37 ppb

148.69 ppb

28.55 ppb

82.96 ppb

<1.04 ppm

138.11 ppb

77.96 ppb

PICO CW22

Jar to Flange Seal

3.2 g

12.768

170125

Jan 25, 2017

(mBq/kg)

54.99

52.65

<29.15

<12.19

10.63

42.42

100.93

92.18

<820.31

208.75

109.69

PTFE Gasket

Hennig Gaskets and Seals

Feb 7, 2017

(ppb or ppm)

4.45 ppb

4.27 ppb

<2.36 ppb

<21.45 ppb

2.62 ppb

10.44 ppb

24.83 ppb

22.67 ppb

16.91 ppb

8.89 ppb

PICO CW23

PN: 1416-1701-1-ND

0.4 g

21.438

170315
170316

Mar 15, 2017

(mBq/kg)

3109.83

648.12

1076.15

348.83

98.76

83.90

<510.00

1556.22

732.27

<3325.00

2817.50

920.00

LED Luxeon Rebel Deep Red SMD

Digi-Key

10 LEDs

Apr 6, 2017

(ppb or ppm)

251.90 ppb

54.50 ppb

87.17 ppb

28.26 ppb

173.81 ppb

147.66 ppb

<125.46 ppb

382.83 ppb

180.14 ppb

227.41 ppb

74.52 ppb

PICO CW24

PN: XPEPHR-L1-0000-00801CT-ND

0.4 g

20.826

170406
170413

Apr 6, 2017

(mBq/kg)

404.18

442.55

684.49

309.95

200.35

80.58

<442.50

126.36

625.64

<3962.50

2650.00

820.00

LED Photo Red 650NM 700MA

Digi-Key

10 LEDs

Apr 27, 2017

(ppb or ppm)

32.74 ppb

35.85 ppb

55.44 ppb

25.11 ppb

352.62 ppb

141.83 ppb

<108.86 ppb

31.08 ppb

153.91 ppb

214.65 ppb

66.42 ppb

PICO CW25

NB PZT Piezeos 5mm diameter and 1 mm thick

1.8 g

13.438

170427
170429
170502
170506

Apr 27, 2017

(mBq/kg)

465.90

159.81

<74.44

23.81

21.08

80.90

84.88

<422.22

<1383.89

1286.11

322.78

Piezo Acoustic Sensors

April 2017 Batch,
12 piezos

May 11, 2017

(ppb or ppm)

37.74 ppb

12.94 ppb

<6.03 ppb

41.90 ppb

37.10 ppb

19.90 ppb

20.88 ppb

<103.87 ppb

104.18 ppb

26.15 ppb

PICO CW26

NB PZT Piezeos
3 mm diameter and 8.7 mm tall

10.6 g

10.722

170525
170601

May 25, 2017

(mBq/kg)

6.32

22.64

<18.68

3.83

4.39

<15.66

32.29

40.04

57.08

187.08

278.02

67.74

Piezo Acoustic Sensors

April 2017 Batch, 17 piezos

Jun 5, 2017

(ppb or ppm)

0.51 ppb

1.83 ppb

<1.51 ppb

6.74 ppb

7.72 ppb

<3.85 ppb

7.94 ppb

9.85 ppb

22.52 ppb

5.49 ppb

PICO CW27

NB PZT Piezeos 5mm diameter and 1 mm thick

4.1 g

13.674

170627

Jun 27, 2017

(mBq/kg)

122.02

58.29

<31.46

8.25

8.56

67.25

35.55

98.694

81.869

<596.83

528.05

114.63

Piezo Acoustic Sensors

June 2017 Batch
25 piezos

Jul 11, 2017

(ppb or ppm)

9.88 ppb

2.72 ppb

<2.55 ppb

14.52 ppb

15.06 ppb

16.54 ppb

8.75 ppb

24.28 ppb

20.14 ppb

42.77 ppb

9.29 ppb

PICO CW28

3M Scotchlite 8725

24.5 g

5.431

170809
170814

Aug 9, 2017

(mBq/kg)

1409.54

93.88

0.66

51.73

97.05

13.42

599.54

51.56

561.21

112.15

<221.02

120.65

145.76

Reflector Material

1” wide

Aug 15, 2017

(ppb or ppm)

114.17 ppb

7.60 ppb

0.05 ppb

4.19 ppb

170.80 ppb

23.61 ppb

147.49 ppb

12.68 ppb

138.06 ppb

27.59 ppb

9.77 ppb

11.81 ppb

Additional Activities:

(mBq/kg)

40K:

131.61

37.82

(ppb or ppm)

4.25 ppm

1.22 ppm

PICO CW29

3M Scotchlite 8830

14.7 g

21.276

170824
17082401
170826
17082601
17062602
170901
170904

Aug 24, 2017

(mBq/kg)

815.49

49.32

69.30

26.20

54.61

6.55

300.76

26.26

248.70

52.83

41.63

130.27

327.21

79.80

Reflector Material

Also Counted as PICO 70

Sep 15, 2017

(ppb or ppm)

66.06 ppb

4.00 ppb

5.61 ppb

2.12 ppb

96.11 ppb

11.53 ppb

73.99 ppb

6.46 ppb

61.18 ppb

13.00 ppb

26.50 ppb

6.46 ppb

Additional Activities:

(mBq/kg)

40K:

342.89

85.28

(ppb or ppm)

11.08 ppm

2.75 ppm

PICO CW30

NB PZT Piezeos 5mm diameter and 8.7 mm high

11.899

171020

Oct 20, 2017

(mBq/kg)

67.94

17.80

17.53

11.14

8.04

2.92

19.14

10.52

10.75

24.65

<140.73

584.53

58.27

Piezo Acoustic Sensors

Sept 2017 Batch
11 piezos

Nov 1, 2017

(ppb or ppm)

5.50 ppb

1.44 ppb

1.42 ppb

0.90 ppb

14.16 ppb

5.14 ppb

4.71 ppb

2.60 ppb

2.65 ppb

6.06 ppb

47.35 ppb

4.72 ppb

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

PICO CW31

Solder No-Clean 18 AWG 63/37 1 LB
Part No: KE1402-ND
Mfg PN: 24-6337-8814

15.0 g

4.950

180222

Feb 22, 2018

(mBq/kg)

<38.93

<67.93

,22.13

<31.07

<101.60

<461.00

22246.53

1213.80

Solder Wire

Kester Solder (vendor Digi-Key)

Feb 27, 2018

(ppb or ppm)

<3.15 ppb

<5.50 ppb

<38.96 ppb

<7.64 ppb

<24.99 ppb

1.80 ppm

0.10 ppm

PICO CW32

Wire Bus Bar 16AWG
Part No.: 295 SV005-ND

14.8 g

7.810

180227
080305

Feb 27, 2018

(mBq/kg)

14.18

16.09

12.08

13.85

<4.05

14.85

11.34

<101.62

<252.91

2998.58

194.60

Tin coated copper wire

Alpha Wire (vendor Digi-Key)

Mar 7, 2018

(ppb or ppm)

1.15 ppb

1.30 ppb

0.98 ppb

1.12 ppb

<7.14 ppb

3.65 ppb

2.79 ppb

<25.00 ppb

242.89 ppb

15.76 ppb

PICO CW33

304 Pieces of Fiducial Marks for PICO 40L

0.122 g

14.690

180628
180629
180710

Jun 28, 2018

(mBq/kg)

804.57

1894.44

<1270.49

191.347

268.835

2928.20

1220.77

<7344.26

<13122.95

1680.33

2713.12

Fiducial Marks

401 ug per mark

Jul 13, 2018

(ppb or ppm)

65.17 ppb

153.45 ppb

<102.91 ppb

336.77 ppb

473.15 ppb

720.34 ppb

300.31 ppb

<1806.69 ppb

136.11 ppb

219.76 ppb

PICO CW34

To be used to suspend the copper coils and retro-reflector

14.1 g

14.622

180713
180717
180730
18073001

Jul 13, 2018

(mBq/kg)

6.84

23.20

13.26

9.68

2.16

2.98

<28.97

<34.89

<236.70

111.96

29.83

316 Stainless Steel Bar

McMaster Carr

Jul 30, 2018

(ppb or ppm)

0.55 ppb

1.88 ppb

1.07 ppb

0.78 ppb

3.81 ppb

5.24 ppb

<7.13 ppb

<8.58 ppb

9.07 ppb

2.42 ppb

PICO CW35

52.3 g

26.050

18082801
180829
180830
180904
18090401
180905
180920

Aug 28, 2018

(mBq/kg)

8.39

3.87

4.15

3.09

2.40

0.81

<7.08

4.53

6.56

<18.05

319.39

21.44

Piezo Acoustic Sensors

Batch: 2018-07-15
40 piezos

1.3075 g / Piezo

Sep 25, 2018

(ppb or ppm)

0.68 ppb

0.31 ppb

0.34 ppb

0.25 ppb

4.22 ppb

1.43 ppb

<1.74 ppb

1.11 ppb

1.61 ppb

25.87 ppb

1.74 ppb

PICO CW36

18.1 g

21.313

181113
181124

Nov 13, 2018

(mBq/kg)

615.80

41.17

<8.80

25.93

4.17

114.40

18.57

56.59

32.33

80.80

61.36

2121.20

128.60

Piezo Acoustic Sensors

Batch: 2018-11-04
14 piezos

1.293 g / Piezo

Dec 5, 2018

(ppb or ppm)

49.88 ppb

3.33 ppb

<0.71 ppb

45.64 ppb

7.34 ppb

28.14 ppb

4.57 ppb

13.92 ppb

7.95 ppb

171.82 ppb

10.42 ppb

PICO CW37

6.7g

14.348

190402
190413

Apr 2, 2019

(mBq/kg)

<50.00

<16.79

<7.16

<59.61

<53.12

<264.80

96.93

67.03

Acetal Plastic Rod

Apr 18, 2019

(ppb or ppm)

<4.05 ppb

<1.36 ppb

<12.6 ppb

<14.66 ppb

<13.07 ppb

7.85 ppb

5.43 ppb

PICO CW38

50 Piezos

69.3 g

14.677

190702

Jul 2, 2019

(mBq/kg)

15.16

4.76

2.67

3.58

3.59

0.99

5.35

4.10

<10.97

12.26

15.23

269.92

20.03

Piezo Acoustic Sensors

June 2019 Batch

1.386 g / piezo

Jul 17, 2019

(ppb or ppm)

1.23 ppb

0.39 ppb

0.22 ppb

0.29 ppb

6.31 ppb

1.73 ppb

1.32 ppb

1.01 ppb

<2.7 ppb

21.86 ppb

1.62 ppb

PICO CW39

Loctite/Henkel

3.0 g

7.750

220509

May 9, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead-free Solder Wire

ID: C511 97SC 3C

May 17, 2022

(mBq/kg)

<19.57

179.50

215.30

6.80

7.75

<25.84

352.10

977.90

<138.60

<108.30

Diameter: 0.56 mm

(ppb or ppm)

<1.59 ppb

14.54 ppb

17.44 ppb

11.96 ppb

13.64 ppb

<6.36 ppb

11.37 ppm

31.59 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

15815.00

1419.00

70.71

114.10

<63.81

82.29

67.84

(ppb or ppm)

1281.02 ppb

114.94 ppb

20.24 ppb

16.69 ppb

PICO CW40

Kester Solder (vendor Digi-Key)

5.8 g

13.618

220928
22100601
221012

Sep 28, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lead-free Solder Wire

Sn: 95.5, Ag: 3.0, Cu: 0.4

Oct 14, 2022

(mBq/kg)

10.64

8.98

230.60

236.80

<9.37

<23.78

108.14

108.60

<45.48

<10.81

24-7068-6403
Lot No: 02136567L

(ppb or ppm)

0.86 ppb

0.73 ppb

18.68 ppb

19.18 ppb

<16.49 ppb

<5.85 ppb

3.49 ppm

3.51 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

375250.00

21320.00

<82.19

<5.16

39.59

15.96

(ppb or ppm)

30.4 ppm

1.73 ppm

9.74 ppb

3.93 ppb

PICO CW41

Exocor

65.7 g

13.566

221109
221121

Nov 9, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

TIG Filler Rod

Executive 316L

Nov 23, 2022

(mBq/kg)

<2.65

<21.11

0.33

0.27

10.65

1.52

<23.15

<5.64

<1.26

2-36” Welding filler rod cut into 8 cm sections

(ppb or ppm)

<0.21 ppb

<1.71 ppb

0.57 ppb

0.47 ppb

2.62 ppb

0.37 ppb

<0.75 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

(mBq/kg)

<356.90

6.55

5.55

3.42

1.05

5.23

2.02

0.86

0.68

2.54

0.95

(ppb or ppm)

<28.91 ppb

1.29 ppb

0.5 ppb

PICO CW42

Lincoln

71.3 g

6.841

221123
221128

Nov 23, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

TIG Filler Rod

316L

Nov 30, 2022

(mBq/kg)

<1.78

<25.37

0.92

0.36

2.17

1.56

115.33

63.56

<7.68

<4.60

2-36” Welding filler rod cut into 8 cm sections

(ppb or ppm)

<0.14 ppb

<2.05 ppb

1.62 ppb

0.64 ppb

0.53 ppb

0.38 ppb

3.73 ppm

2.05 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

(mBq/kg)

<951.70

<9.71

4.29

2.30

9.20

2.85

1.33

0.81

2.40

1.62

(ppb or ppm)

<77.09 ppb

2.26 ppb

0.7 ppb

PICO CW43

Flux Coated

96.3 g

6.862

221130
221201

Nov 30, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

TIG Filler Rod

316L

Dec 7, 2022

(mBq/kg)

14870.00

330.60

40070.00

1910.00

1051.00

24.73

8635.00

244.90

79438.00

4206.00

<12.70

<38.73

2-36” Welding filler rod cut into 8 cm sections

(ppb or ppm)

1204.47 ppb

26.78 ppb

3245.67 ppb

154.71 ppb

1849.76 ppb

43.52 ppb

2124.21 ppb

60.25 ppb

2565.85 ppm

135.85 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

(mBq/kg)

73510.00

4452.00

<123.50

105.72

34.27

12470.00

319.20

<25.81

<15.37

(ppb or ppm)

5954.31 ppb

360.61 ppb

3067.62 ppb

78.52 ppb

PICO CW44

Exocor

97.1 g

14.578

230404

Apr 4, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

TIG Filler Rod

Executive 316/316L

Apr 19, 2023

(mBq/kg)

3.54

0.93

<27.13

0.38

0.24

77.40

1.14

<44.24

<6.56

<2.36

3-36” Welding filler rod cut into 8 cm sections

(ppb or ppm)

0.29 ppb

0.08 ppb

<2.2 ppb

0.68 ppb

0.42 ppb

19.04 ppb

0.28 ppb

<1.43 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

57Co

58Co

(mBq/kg)

223.30

1570.00

<4.40

5.11

1.54

6.77

1.88

<0.75

1.15

1.03

(ppb or ppm)

18.09 ppb

127.17 ppb

1.67 ppb

0.46 ppb

PICO CW45

PICO Heating Element Circuit Boards

2.2 g

13.742

230517

May 17, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Polyimide Circuit Boards

May 31, 2023

(mBq/kg)

<16.91

<258.90

4.85

4.70

15.34

22.89

12716.00

1914.00

<193.80

<40.27

(ppb or ppm)

<1.37 ppb

<20.97 ppb

8.53 ppb

8.27 ppb

3.77 ppb

5.63 ppb

410.73 ppm

61.82 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<1587.00

<124.00

<24.31

<95.26

(ppb or ppm)

<128.55 ppb

<23.43 ppb

PICO CW46

SAC305 No-Clean T3 Solder Paste

35.721 g

7.956

230719

Jul 19, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Chip Quick Solder Paste

Type: SMD291SNL50T3

Jul 27, 2023

(mBq/kg)

<7.47

<220.60

<2.87

8.06

6.14

217.09

106.90

<13.26

<3.15

Lot No.: 520005-19986

(ppb or ppm)

<0.61 ppb

<17.87 ppb

<5.05 ppb

1.98 ppb

1.51 ppb

7.01 ppm

3.45 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

535680.00

32320.00

<25.21

<4.50

8.49

4.47

(ppb or ppm)

43.39 ppm

2.62 ppm

2.09 ppb

1.1 ppb

PICO CW47

T4 – Halogen & Pb Free

22.90 g

27.113

231228
240105
240117

Dec 28, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Loctite Solder Paste

PN: GC 10 SAC305T4 885V 52K

Jan 25, 2024

(mBq/kg)

<2.99

<140.70

2.57

1.61

<5.70

<177.30

<18.55

<5.80

Batch No: A733040271

(ppb or ppm)

<0.24 ppb

<11.4 ppb

4.52 ppb

2.82 ppb

<1.4 ppb

<5.73 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

251960.00

14500.00

<29.52

<2.24

6.49

3.78

(ppb or ppm)

20.41 ppm

1.17 ppm

1.6 ppb

0.93 ppb

PICO CW48

Type: EP21TDCS-LO Part A

5.971 g

16.479

240226
240313

Feb 26, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

MasterBond Epxoy Part A

Lot: 225967

Mar 15, 2024

(mBq/kg)

<8.96

<266.70

4.39

2.12

3.69

9.17

797.35

407.90

<64.07

<24.95

(ppb or ppm)

<0.73 ppb

<21.6 ppb

7.72 ppb

3.73 ppb

0.91 ppb

2.26 ppb

25.75 ppm

13.18 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<9206.00

<112.80

<10.88

38.57

16.40

(ppb or ppm)

<745.69 ppb

9.49 ppb

4.03 ppb

PICO CW49

Type: EP21TDCS-LO Part B

6.900 g

12.657

230315
23031801

Mar 15, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

MasterBond Epxoy Part B

Lot: 225967

Mar 28, 2024

(mBq/kg)

<13.84

<138.70

<2.97

<23.88

639.33

371.70

<62.81

<18.71

(ppb or ppm)

<1.12 ppb

<11.23 ppb

<5.23 ppb

<5.87 ppb

20.65 ppm

12.01 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

2161.70

7968.00

33.31

45.04

<19.84

<36.37

(ppb or ppm)

175.1 ppb

645.41 ppb

<8.95 ppb

PICO CW50

Type: TMP1826DGKR

0.253 g

13.467

240411
240419
240422

Apr 11, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Texas Instruments Temperature Sensors

One-Wire temperature sensors

Apr 25, 2024

(mBq/kg)

<129.40

<1935.00

32.21

36.20

<251.00

165.01

9182.00

<1703.00

379.20

388.60

10 units

(ppb or ppm)

<10.48 ppb

<156.74 ppb

56.69 ppb

63.71 ppb

<61.75 ppb

5.33 ppm

296.58 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<11930.00

<2127.00

<485.50

757.20

385.70

(ppb or ppm)

<0.97 ppm

186.27 ppb

94.88 ppb

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

PICO CW51

Part Number: C0805X105K8RAC7210

0.140 g

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

KEMET Capacitors

Type: 1uF 10V X7R 0805

(mBq/kg)

13 units

(ppb or ppm)

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

(ppb or ppm)

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)