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.

SNOLAB 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

SNOLAB CW01

17.199

130214
130508
13051601

Feb 14, 2013 –- Feb 19, 2013

(mBq)

0.281

0.168

0.047

0.133

0.039

0.036

1.833

0.974

<0.183

<1.815

0.598

0.760

Empty Cowie Bottle Background

May 8, 2013 –- May 21, 2013

KCM CW01a

Sample #1a

15 g (total)

7.741

180131

Jan 31, 2018

(Bq/kg)

81.23

2.55

17.80

1.74

2.66

2.79

61.01

2.75

142.25

4.57

3.25

2.72

<0.65

Water Sample from Kidd Creek Mine Level 7850

29.01.2018_KC7850_12299_SLRS

7.5 g (inside well)

Feb 8, 2018

(ppb or ppm)

6.58 ppm

0.21 ppm

1.44 ppm

0.14 ppm

4.69 ppm

0.49 ppm

15.01 ppm

0.68 ppm

34.99 ppm

1.12 ppm

<53.03 ppb

KCM CW01b

Sample #1b

13.5 g

6.935

180215
18021501

Feb 15, 2018

(Bq/kg)

111.85

3.35

31.13

2.83

2.41

0.28

10.19

0.61

137.92

4.51

<4.03

<1.36

Water Sample from Kidd Creek Mine Level 7850

29.01.2018_KC7850_12299_SLRS

7.5 g (inside well)

Feb 22, 2018

(ppb or ppm)

9.06 ppm

0.27 ppm

2.52 ppm

0.23 ppm

4.23 ppm

0.49 ppm

2.51 ppm

0.15 ppm

33.93 ppm

1.11 ppm

<110.12 ppb

KCM CW02a

Sample #2a

15 g

6.889

180208
18020801
180213

Feb 8, 2018

(mBq/kg)

43.62

35.11

<25.87

7.43

6.50

26.22

23.43

120.41

56.98

<658.93

97.07

82.53

Service Water Sample from Kidd Creek Mine Level 7850

29.01.2018_KC7850_SW_SLRS

7.5 g (inside well)

Feb 15, 2018

(ppb or ppm)

3.53 ppb

2.84 ppb

<2.10 ppb

13.07 ppb

11.43 ppb

6.45 ppb

5.76 ppb

29.62 ppb

14.02 ppb

7.86 ppb

6.69 ppb

KCM CW02b

Sample #2b

14 .2 g

11.872

180307
180314

Mar 7, 2018

(mBq/kg)

6.27

25.48

38.00

21.73

<6.13

24.10

18.66

59.13

42.82

<325.20

163.33

60.00

Service Water Sample from Kidd Creek Mine Level 7850

29.01.2018_KC7850_SW_SLRS

7.5 g (inside well)

Mar 19, 2018

(ppb or ppm)

0.51 ppb

2.06 ppb

3.08 ppb

1.76 ppb

<10.80 ppb

5.93 ppb

4.59 ppb

14.55 ppb

10.53 ppb

13.23 ppb

4.86 ppb

SNOLAB CW02

FisherBrand FS585008
8 mL test tube

4.5 g

22.604

18041101
180420
180425

Apr 11, 2018

(mBq/kg)

88.59

39.61

<29.78

3.16

6.06

15.88

25.24

23.53

49.04

<323.78

44.44

58.22

Empty Sample Vial

HDPE
17.5 mm diam
63 mm tall

May 4, 2018

(ppb or ppm)

7.18 ppb

3.21 ppb

<2.41 ppb

5.56 ppb

10.66 ppb

3.91 ppb

6.21 ppb

5.79 ppb

12.06 ppb

3.60 ppb

4.72 ppb

SNOLAB CW03

Lead sample from Soudan lead

70.9 g

17.492

18121901
190104

Dec 19, 2018

(mBq/kg)

23.89

21.86

<121.90

29.85

21.41

27.89

25.91

<87.29

<32.54

116020.00

6650.00

Lead Rectangular Cuboid Soudan Lead #1

1” x 7/16” x 7/16”
2 rectangular cuboids counted together

Efficiencies are corrected for self-absorption by the lead using ANGLE4

Jan 7, 2019

(ppb or ppm)

1.94 ppb

1.77 ppb

<9.87 ppb

52.54 ppb

37.68 ppb

6.86 ppb

6.37 ppb

<21.47 ppb

9.4 ppm

0.54 ppm

SNOLAB CW04

Lead sample from Soudan lead

73.3 g

14.428

190527
190601

May 27, 2019

(mBq/kg)

9.81

18.56

<112.30

30.48

13.82

21.86

21.12

28.04

63.38

<38.06

18606.00

1719.00

Lead Rectangular Cuboid Soudan Lead #2

1” x 7/16” x 7/16”
2 rectangular cuboids counted together

Efficiencies are corrected for self-absorption by the lead using ANGLE4

Jun 11, 2019

(ppb or ppm)

0.79 ppb

1.5 ppb

<9.1 ppb

53.64 ppb

24.32 ppb

5.38 ppb

5.2 ppb

6.9 ppb

15.59 ppb

1.51 ppm

0.14 ppm

SNOLAB CW05

Lead sample from Soudan lead

72.4 g

23.761

190801
190806

Aug 1, 2019

(mBq/kg)

12.61

16.59

<72.11

33.66

16.39

33.48

23.90

<79.14

23.11

18.46

82250.00

4723.00

Lead Rectangular Cuboid Soudan Lead #3

1” x 7/16” x 7/16”
2 rectangular cuboids counted together

Efficiencies are corrected for self-absorption by the lead using ANGLE4

Aug 26, 2019

(ppb or ppm)

1.02 ppb

1.34 ppb

<5.84 ppb

59.24 ppb

28.85 ppb

8.24 ppb

5.88 ppb

<19.47 ppb

6.66 ppm

0.38 ppm

SNOLAB CW06

Lead sample from Soudan lead

72.3 g

30.424

191007
191014
19101401
191016

Oct 7, 2019

(mBq/kg)

50.49

19.47

29.20

171.90

<11.14

<22.97

<70.28

<18.63

140850.00

7580.00

Lead Rectangular Cuboid Soudan Lead #4

1” x 7/16” x 7/16”
2 rectangular cuboids counted together

Efficiencies are corrected for self-absorption by the lead using ANGLE4

Nov 8, 2019

(ppb or ppm)

4.09 ppb

1.58 ppb

2.37 ppb

13.92 ppb

<2.74 ppb

<5.65 ppb

<17.29 ppb

11.41 ppm

0.61 ppm

SNOLAB CW07

Swipe Test Prepared on 2019.01.24

0.2 g

6.746

190130

Jan 30, 2019

(mBq)

444.30

1481.00

<1149.00

<162.20

<1569.00

489.10

2258.00

<18670.00

5969.00

3907.00

XIA Th-230 Source Swipe Test

1 swipe placed inside vial with the swiped side facing outwards

Feb 6, 2019

(ppb or ppm)

35.99 ppb

119.96 ppb

<93.07 ppb

<285.47 ppb

<385.97 ppb

120.32 ppb

555.47 ppb

0.48 ppm

0.32 ppm

SNOLAB CW08

~55cm long strand

24.399 g

7.092

190625

Jun 25, 2019

(mBq)

17.32

25.97

<41.32

6.48

9.40

<30.45

<65.57

<125.30

8045.10

444.90

White Silver Sil-Pure Pb-free

CMP Global Ltd

Jul 2, 2019

(ppb or ppm)

1.4 ppb

2.1 ppb

<3.35 ppb

11.41 ppb

16.54 ppb

<7.49 ppb

<16.13 ppb

651.65 ppb

36.04 ppb

SNOLAB CW09

NIST Sample

3.689 g

17.674

200213
200114

Feb 13, 2020

(mBq)

14370.00

639.20

13300.00

1456.00

874.10

32.78

16630.00

643.92

6942.00

513.00

12269.57

1547.54

10937.00

920.40

Powdered Ocean Sediment Calibration Sample

Cross Comparison Sample

Mar 2, 2020

(ppb or ppm)

1163.97 ppb

51.78 ppb

1077.3 ppb

117.94 ppb

1538.42 ppb

57.69 ppb

4090.98 ppb

158.4 ppb

1707.73 ppb

126.2 ppb

885.9 ppb

74.55 ppb

60Co

241Am

40K

(mBq)

<2990.00

15468.00

803.20

387388.89

90244.11

(ppb or ppm)

12512.66 ppm

2914.88 ppm

SNOLAB CW10

Lucas Cell Coating

13.0 g

23.614

201218

Dec 18, 2020

(mBq/kg)

<15.69

16.39

8.28

<1.14

<14.98

<31.90

20.31

51.52

21.06

22.39

ZnS(Ag) Powder

Saint-Gobain

The sample is also counted on the VDA detector as SNOLAB V33

Jan 11, 2021

(ppb or ppm)

<1.27 ppb

1.33 ppb

0.67 ppb

<0.28 ppb

<3.69 ppb

<7.85 ppb

1.71 ppb

1.81 ppb

SNOLAB CW11

Project 2020-11

2.8 g

13.557

220204

Feb 4, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Regular Activated Charcoal

Feb 18, 2022

(mBq/kg)

465.50

47.48

166.90

225.40

4.38

8.57

114.50

37.57

499650.00

27610.00

183.05

118.90

<164.60

(ppb or ppm)

37.71 ppb

3.85 ppb

13.52 ppb

18.26 ppb

7.71 ppb

15.07 ppb

28.17 ppb

9.24 ppb

16138.7 ppm

891.8 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

642.91

981.50

<501.40

<117.60

<194.50

(ppb or ppm)

52.08 ppb

79.5 ppb

<47.85 ppb

SNOLAB CW12

Project 2020-11

3.2 g

13.763

220218

Feb 18, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Regular Activated Charcoal Rinsed with Nitric Acid

Sample dried with N2 gas.

Mar 4, 2022

(mBq/kg)

<33.25

<205.10

<5.38

99.75

20.06

26256.00

2653.00

<162.50

<72.30

(ppb or ppm)

<2.69 ppb

<16.61 ppb

<9.47 ppb

24.54 ppb

4.93 ppb

848.07 ppm

85.69 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<548.20

<93.96

<24.32

50.23

46.65

(ppb or ppm)

<44.4 ppb

12.36 ppb

11.48 ppb

SNOLAB CW13

Project 2020-11

4.2 g

6.890

220401

Apr 1, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Regular Activated Charcoal

Apr 8, 2022

(mBq/kg)

6867.00

232.40

7455.00

543.10

287.40

17.06

6201.00

255.60

16764.00

2646.00

<60.32

<75.14

(ppb or ppm)

556.23 ppb

18.82 ppb

603.86 ppb

43.99 ppb

505.82 ppb

30.03 ppb

1525.45 ppb

62.88 ppb

541.48 ppm

85.47 ppm

CarboTech - Activated Carbon – CMS-H2

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

2764.20

884.50

261.34

255.90

<83.53

5379.00

260.20

(ppb or ppm)

223.9 ppb

71.64 ppb

1323.23 ppb

64.01 ppb

SNOLAB CW14

Project 2020-11

4.7 g

10.798

220408

Apr 8, 2022

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Regular Activated Charcoal Rinsed with Nitric Acid

Sample dried with N2 gas.

Apr 19, 2022

(mBq/kg)

3005.00

107.90

5538.00

376.30

182.30

10.14

4350.00

169.60

9237.80

1489.00

<94.92

<56.32

(ppb or ppm)

243.41 ppb

8.74 ppb

448.58 ppb

30.48 ppb

320.85 ppb

17.85 ppb

1070.1 ppb

41.72 ppb

298.38 ppm

48.09 ppm

CarboTech - Activated Carbon – CMS-H2

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

1950.10

629.50

<209.10

<76.88

2219.00

127.50

(ppb or ppm)

157.96 ppb

50.99 ppb

545.87 ppb

31.37 ppb

SNOLAB CW15

Sample Rock Bolt from TAD Expansion Area

131.1 g

12.735

230531

May 31, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Rock Bolt
(Carbon Steel)

Jun 13, 2023

(mBq/kg)

33.55

2.04

101.00

24.59

1.86

0.36

53.87

3.08

877.76

90.74

<5.33

<2.68

(ppb or ppm)

2.72 ppb

0.16 ppb

8.18 ppb

1.99 ppb

3.28 ppb

0.63 ppb

13.25 ppb

0.76 ppb

28.35 ppm

2.93 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

107.31

472.30

6.47

7.09

<2.03

50.54

3.96

(ppb or ppm)

8.69 ppb

38.26 ppb

12.43 ppb

0.97 ppb

SNOLAB CW16

Charcoal Trap for Gas Assays at SNOLAB

4.95 g

15.649

240209
240910
24021001

Feb 9, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Blucher Protects Spherical Adsorbents

Feb 26, 2024

(mBq/kg)

72.96

11.98

<52.53

<3.15

5.06

10.02

1509.00

559.60

<85.24

<10.57

(ppb or ppm)

5.91 ppb

0.97 ppb

<4.25 ppb

<5.54 ppb

1.24 ppb

2.46 ppb

48.74 ppm

18.08 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<363.70

<107.90

<14.78

8.06

17.71

(ppb or ppm)

<29.46 ppb

1.98 ppb

4.36 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:

57Co

(mBq/kg)

(ppb or ppm)