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:

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: 583.19 and 2614.53 keV,

228Ac: 911.21 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. 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)

SNOLAB G001

Acrylic Stand 1 made by SNOLAB Installation Group

P1: 10.5

180924

Sep 24, 2018

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Acrylic Stand 1

P2: 36.792

Oct 5, 2018

(mBq/kg)

4.15

0.21

9.43

2.26

0.23

0.11

1.87

0.16

4.03

0.72

0.029

0.062

0.059

0.026

No Backgrounds are subtracted from these results

P3: 37.374

181031
181119

Oct 31, 2018

(ppb or ppm)

Dec 12, 2018

Results:

210Pb:

7Be:

54Mn

228Ac:

210Po:

Total is:

190826

Aug 26, 2019

(mBq/kg)

835.51

44.06

2.35

0.80

0.044

0.043

3.60

0.28

10269.00

4584.00

84.666

Oct 4, 2019

(ppb or ppm)

SNOLAB G002

Acrylic Stand 2 made by SNOLAB Installation Group

24.417

181005
181008
181017
181018
181022

Oct 5, 2018

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Acrylic Stand 2

Oct 31, 2018

(mBq/kg)

5.14

0.26

8.69

2.74

0.20

0.30

1.72

0.17

3.86

0.81

<0.14

0.13

0.04

No Backgrounds are subtracted from these results

and

(ppb or ppm)

39.874

181212
190107
19011601

Dec 12, 2018

Results:

210Pb:

7Be:

54Mn

228Ac:

210Po:

Total is:

19011702
19012102
19012201

Jan 23, 2019

(mBq/kg)

864.94

46.00

0.99

0.86

<0.060

3.84

0.34

5860.10

5060.00

64.291

(ppb or ppm)

SNOLAB G003

NIST Sample

28.825 g

2.833

200127

Jan 27, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Powdered Ocean Sediment Calibration Sample

Cross Comparison Sample A

Jan 30, 2020

(mBq/kg)

2898.00

126.40

11270.00

1611.00

585.20

34.85

1458.00

102.10

33933.00

2130.00

3357.60

197.80

22.43

14.88

Sample placed directly on top of the detector

(ppb or ppm)

234.74 ppb

10.24 ppb

0.91 ppm

0.13 ppm

1.03 ppm

0.06 ppm

0.36 ppm

0.03 ppm

1096.04 ppm

68.8 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

241Am:

(mBq/kg)

8358.40

2997.00

<264.90

37.67

23.32

4729.00

207.40

22806.00

1224.00

(ppb or ppm)

0.68 ppm

0.24 ppm

1.16 ppm

0.05 ppm

SNOLAB G004

NIST Sample

28.825 g

4.708

200130

Jan 30, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Powdered Ocean Sediment Calibration Sample

Cross Comparison Sample A

Feb 4, 2020

(mBq/kg)

3819.00

187.70

10400.00

2107.00

449.80

62.29

2875.00

184.00

38322.00

2742.00

3593.90

240.30

18.77

22.74

Sample placed 45mm above the detector (one counting pot container)

(ppb or ppm)

309.34 ppb

15.2 ppb

0.84 ppm

0.17 ppm

0.79 ppm

0.11 ppm

0.71 ppm

0.05 ppm

1237.8 ppm

88.57 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

241Am:

(mBq/kg)

2032.10

5253.00

<527.60

38.04

41.16

5875.00

318.40

20524.00

1173.00

(ppb or ppm)

164.6 ppb

425.49 ppb

1.45 ppm

0.08 ppm

SNOLAB G005

NIST Sample

33.454 g

6.542

200302

Mar 2, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Powdered Ocean Sediment Calibration Sample

Cross Comparison Sample B

Mar 9, 0202

(mBq/kg)

2387.00

88.77

10880.00

1315.00

595.40

23.90

1071.00

65.77

33306.00

1860.00

3355.90

179.80

<17.58

Sample placed directly on top of the detector

(ppb or ppm)

193.35 ppb

7.19 ppb

0.88 ppm

0.11 ppm

1.05 ppm

0.04 ppm

263.47 ppb

16.18 ppb

1075.78 ppm

60.08 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

241Am:

(mBq/kg)

8193.00

1916.00

<157.3

19.55

14.16

4937.00

165.20

22456.00

1172.00

(ppb or ppm)

0.66 ppm

0.16 ppm

1.21 ppm

0.04 ppm

SNOLAB G006

NIST Sample

33.454 g

13.958

200309

Mar 9, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Powdered Ocean Sediment Calibration Sample

Cross Comparison Sample B

Mar 24, 2020

(mBq/kg)

2018.00

96.50

13050.00

1588.00

581.70

35.90

1242.00

84.92

39480.00

2276.00

3554.50

197.60

<18.54

Sample placed 45mm above the detector (one counting pot container)

(ppb or ppm)

163.46 ppb

7.82 ppb

1.06 ppm

0.13 ppm

1.02 ppm

0.06 ppm

305.53 ppb

20.89 ppb

1275.2 ppm

73.51 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

241Am:

(mBq/kg)

11037.00

3353.00

<365.40

16.93

19.91

5735.00

214.50

20729.00

1099.00

(ppb or ppm)

894 ppb

271.59 ppb

1.41 ppm

0.05 ppm

SNOLAB G007

Part No. TS-5

60.3 g

5.500

200204

Feb 4, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Plastic Process Equipment Inc.

Macedonia, OH 44056

Feb 10, 2020

(mBq/kg)

639.00

29.45

2112.00

231.80

107.70

8.01

109.80

12.02

207.50

61.87

1.47

4.57

<1.58

White PTFE Thread Sealant Paste

(ppb or ppm)

51.76 ppb

2.39 ppb

171.07 ppb

18.78 ppb

189.55 ppb

14.1 ppb

27.01 ppb

2.96 ppb

6.7 ppm

2 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

3549.20

882.10

<63.91

<9.21

286.60

26.26

(ppb or ppm)

287.49 ppb

71.45 ppb

70.5 ppb

6.46 ppb

SNOLAB G008

Type: 7093

416.4 g

2.667

200210

Feb 10, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

GST II General Purpose Air and Water Hose

Parker Hannifin Corp

Feb 13, 2020

(mBq/kg)

836.00

31.94

3580.00

336.70

197.80

9.93

388.00

23.53

1367.40

122.50

<5.19

<2.54

(ppb or ppm)

67.72 ppb

2.59 ppb

289.98 ppb

27.27 ppb

348.13 ppb

17.47 ppb

95.45 ppb

5.79 ppb

44.17 ppm

3.96 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

6020.20

698.00

<64.99

4.98

4.97

1423.00

53.25

(ppb or ppm)

487.64 ppb

56.54 ppb

350.06 ppb

13.1 ppb

SNOLAB G009

ID Type: GL00215

888.7 g

4.708

200213

Feb 13, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Gates Adapta Flex Multipurpose 1 ½” Hose

Feb 18, 2020

(mBq/kg)

140.90

6.15

478.60

56.90

16.35

1.96

60.11

4.34

607.97

52.92

<1.41

<0.80

(ppb or ppm)

11.41 ppb

0.5 ppb

38.77 ppb

4.61 ppb

28.78 ppb

3.45 ppb

14.79 ppb

1.07 ppb

19.64 ppm

1.71 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

385.05

227.90

11.30

12.20

1.63

1.07

103.30

7.37

(ppb or ppm)

31.19 ppb

18.46 ppb

25.41 ppb

1.81 ppb

SNOLAB G010

Type: 7322

1041.7 g

2.917

200218

Feb 18, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Parker Series Super Flex Hose

Large Diameter General Service Air and Water Hose

Feb 21, 2020

(mBq/kg)

1107.00

36.25

884.00

365.20

253.40

10.70

382.90

22.29

2997.50

195.50

<2.69

2.07

2.11

Material: EPDM

(ppb or ppm)

89.67 ppb

2.94 ppb

71.6 ppb

29.58 ppb

445.98 ppb

18.83 ppb

94.19 ppb

5.48 ppb

96.82 ppm

6.31 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

8670.80

856.20

<67.74

12.68

4.89

1865.00

61.37

(ppb or ppm)

702.33 ppb

69.35 ppb

458.79 ppb

15.1 ppb

SNOLAB G011

Fittings are made from polypropylene

456.8 g

3.625

200221

Feb 21, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Philmac Compression Fittings

This sample contains only ½” size fittings

Feb 25, 2020

(mBq/kg)

320.50

14.81

1246.00

153.50

58.64

5.28

226.60

15.11

304.66

49.72

<2.16

0.68

1.14

Fitting Labels: IPS SIDR

(ppb or ppm)

25.96 ppb

1.2 ppb

100.93 ppb

12.43 ppb

103.21 ppb

9.3 ppb

55.74 ppb

3.72 ppb

9.84 ppm

1.61 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

1950.80

500.70

<43.48

5.34

3.51

682.90

29.93

(ppb or ppm)

158.01 ppb

40.56 ppb

167.99 ppb

7.36 ppb

SNOLAB G012

Fittings are made from polypropylene

469.8 g

5.958

200225

Feb 25, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Philmac Compression Fittings

This sample contains a 1 ¾” size fitting

Mar 2, 2020

(mBq/kg)

434.00

17.79

1939.00

204.30

71.18

6.32

421.90

23.33

538.18

61.57

<3.05

1.25

1.31

Fitting Labels: IPS SIDR

(ppb or ppm)

35.15 ppb

1.44 ppb

157.06 ppb

16.55 ppb

125.28 ppb

11.12 ppb

103.79 ppb

5.74 ppb

17.38 ppm

1.99 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

1424.30

503.80

<47.53

15.11

4.45

1797.00

57.48

(ppb or ppm)

115.37 ppb

40.81 ppb

442.06 ppb

14.14 ppb

SNOLAB G013

Sample from TAD Expansion Project

919.2 g

6.778

230531

May 31, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Steel L-Shaped Holder Plate
(Rabbit Ear)

Jun 7, 2023

(mBq/kg)

13.03

1.52

22.28

29.67

<1.37

24.55

1.98

289.01

23.77

<0.65

<0.68

(ppb or ppm)

1.06 ppb

0.12 ppb

1.8 ppb

2.4 ppb

<2.41 ppb

6.04 ppb

0.49 ppb

9.34 ppm

0.77 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

<529.90

<11.56

1.13

0.60

29.35

3.19

(ppb or ppm)

<42.92 ppb

7.22 ppb

0.78 ppb

SNOLAB G014

Sample from TAD Expansion Project

225.8 g

2.034

230607

Jun 7, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Shotcrete

Jun 9, 2023

(mBq/kg)

18330.00

380.80

35880.00

2108.00

941.50

33.99

47100.00

996.60

396360.00

20320.00

<25.43

<70.98

(ppb or ppm)

1484.73 ppb

30.84 ppb

2906.28 ppb

170.75 ppb

1657.04 ppb

59.82 ppb

11586.6 ppb

245.16 ppb

12802.43 ppm

656.34 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

18328.00

1792.00

158.97

306.60

354.95

43.54

39830.00

959.40

(ppb or ppm)

1484.57 ppb

145.15 ppb

9798.18 ppb

236.01 ppb

SNOLAB G015

Sample from TAD Expansion Project

58.2 g

11.618

230609

Jun 9, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Chain – Two Links

Jun 21, 2023

(mBq/kg)

<1.31

<93.93

<2.74

21.21

4.44

126.43

30.35

<3.14

<2.58

(ppb or ppm)

<0.11 ppb

<7.61 ppb

<4.82 ppb

5.22 ppb

1.09 ppb

4.08 ppm

0.98 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

<423.80

<23.09

<2.93

13.61

6.62

(ppb or ppm)

<34.33 ppb

3.35 ppb

1.63 ppb

SNOLAB G016

Grizzly Claw

171.8 g

3.923

240212

Feb 12, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Kicking Horse Coffee

Kicking Horse Coffee Company

Feb 16, 2024

(mBq/kg)

35.48

11.31

<280.10

<8.08

10.19

8.43

336360.00

17220.00

70.55

16.09

14.02

14.40

(ppb or ppm)

2.87 ppb

0.92 ppb

<22.69 ppb

<14.22 ppb

2.51 ppb

2.07 ppb

10864.43 ppm

556.21 ppm

Coffee Used Underground at SNOLAB

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<118.40

<64.64

37.27

14.12

62.02

40.58

(ppb or ppm)

<9.59 ppb

15.26 ppb

9.98 ppb

SNOLAB G017

Ultra Spec 500 Interior Semi-Gloss F546 Paint

483.5 g

9.972

240216

Feb 16, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Benjamin Moore Paint

Feb 26, 2024

(mBq/kg)

765.50

19.16

1350.00

111.20

30.87

2.59

1367.00

37.22

20995.00

1085.00

<3.63

<1.86

Benjamin Moore Inc, Concord ON

(ppb or ppm)

62.01 ppb

1.55 ppb

109.35 ppb

9.01 ppb

54.33 ppb

4.55 ppb

336.28 ppb

9.16 ppb

678.14 ppm

35.05 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

<118.80

32.24

26.84

9.01

3.25

1402.00

40.40

(ppb or ppm)

<9.62 ppb

344.89 ppb

9.94 ppb

SNOLAB G018

72% Cocoa

201.3 g

5.021

240425

Apr 25, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Irresistibles Dark Chocolate

Made In Switzerland

Apr 30, 2024

(mBq/kg)

746.70

26.50

828.10

166.00

26.74

5.66

405.30

21.14

243680.00

12480.00

113.43

15.56

<21.91

(ppb or ppm)

60.48 ppb

2.15 ppb

67.08 ppb

13.45 ppb

47.06 ppb

9.95 ppb

99.7 ppb

5.2 ppb

7870.86 ppm

403.1 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<138.80

<115.40

<13.56

897.30

49.21

(ppb or ppm)

<11.24 ppb

220.74 ppb

12.11 ppb

SNOLAB G019

74% Cocoa

201.0 g

6.951

240430

Apr 30, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Jacquot Dark Chocolate

Made in France

May 7, 2024

(mBq/kg)

1153.00

33.19

874.10

151.10

30.87

4.95

662.30

25.61

209130.00

10710.00

100.57

13.01

<12.93

(ppb or ppm)

93.39 ppb

2.69 ppb

70.8 ppb

12.24 ppb

54.33 ppb

8.7 ppb

162.93 ppb

6.3 ppb

6754.9 ppm

345.93 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

134Cs:

(mBq/kg)

<121.10

<68.25

18.37

10.04

1743.00

61.38

33.98

8.24

(ppb or ppm)

<9.81 ppb

428.78 ppb

15.1 ppb

SNOLAB G20

7o% Cocoa

199.9 g

2.917

240507

May 7, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lindt Dark Chocolate

Made In Switzerland

May 10, 2024

(mBq/kg)

412.40

21.78

179.20

172.60

3.20

5.88

213.20

18.47

163750.00

8435.00

55.19

15.22

<13.12

(ppb or ppm)

33.4 ppb

1.76 ppb

14.52 ppb

13.98 ppb

5.63 ppb

10.35 ppb

52.45 ppb

4.54 ppb

5289.13 ppm

272.45 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

134Cs

(mBq/kg)

<133.10

<99.97

<18.06

450.10

44.64

13.22

10.45

(ppb or ppm)

<10.78 ppb

110.72 ppb

10.98 ppb

SNOLAB G021

Swagelock, thread lubricant

62.9 g

6.789

241210

Dec 10, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Swagelok Blue Goop

Dec 17, 2024

(mBq/kg)

476.20

20.17

605.10

120.20

6.94

4.38

646.80

27.88

4396.70

297.90

<11.65

6.46

4.21

(ppb or ppm)

38.57 ppb

1.63 ppb

49.01 ppb

9.74 ppb

12.22 ppb

7.7 ppb

159.11 ppb

6.86 ppb

142.01 ppm

9.62 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

<211.30

4.75

5.32

707.80

37.01

(ppb or ppm)

174.12 ppb

9.1 ppb

SNOLAB G22

Oct. 2024 Dep Sample Resin

6.916

250128

Jan 28, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Resin Sample

Feb 4, 2025

(mBq)

0.58

0.46

<9.32

<0.24

3.74

0.55

69.89

7.14

<0.29

<0.084

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq

<12.30

837.69

45.09

<0.15

0.85

0.75

0.96

0.27

SNOLAB G23

Nov. 2024 Dep Sample Resin

13.159

250204

Feb 4, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Resin Sample

Feb 18, 2025

(mBq)

<0.078

<3.29

<0.13

2.15

0.33

31.35

3.52

<0.17

<0.13

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq

<11.76

548.46

29.09

<0.13

0.38

0.51

0.82

0.17

SNOLAB G24

Nov. 2024 Inlet Filter

5.979

290218

Feb 18, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Filter Sample

Feb 24, 2025

(mBq)

<0.32

<6.28

<0.32

3.10

0.52

16.79

3.87

<0.29

<0.094

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq

<20.01

440.95

25.60

<0.21

<0.94

<0.077

SNOLAB G25

Nov. 2024 Dep Filters 5-0.1 um

7.000

250224

Feb 24, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Filter Sample

Mar 3, 2025

(mBq)

<0.28

<4.84

<0.33

2.15

0.45

4.01

2.46

<0.20

<0.16

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq

<12.69

47.87

4.85

<0.18

<1.10

<0.20

SNOLAB G26

Air Filter Puck

1.124 g

2.930

250314

Mar 14, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Air Monitoring Station Filter

181 hours

Mar 17, 2025

(mBq/kg)

3167.00

607.50

11130.00

8129.00

<721.80

767.50

435.60

16854.00

3932.00

139.89

175.00

<52.25

250219 – 250226

(ppb or ppm)

256.53 ppb

49.21 ppb

901.53 ppb

658.45 ppb

<1270.37 ppb

188.81 ppb

107.16 ppb

544.38 ppm

127 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq/kg)

12438000.00

1280000.00

24724000.00

2526000.00

<240.40

719.60

560.80

1467.10

345.30

(ppb or ppm)

1007.48 ppm

103.68 ppm

177.02 ppb

137.96 ppb

SNOLAB G27

Air Filter Puck

1.173 g

3.903

250317

Mar 17, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Air Monitoring Station Filter

215 hours

Mar 21, 2025

(mBq/kg)

2663.00

485.20

6724.00

6534.00

<574.80

1825.00

464.60

20394.00

3897.00

172.42

156.60

<91.44

250226 – 250307

(ppb or ppm)

215.7 ppb

39.3 ppb

544.64 ppb

529.25 ppb

<1011.65 ppb

448.95 ppb

114.29 ppb

658.73 ppm

125.87 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq/kg)

9074300.00

904600.00

28149000.00

2785000.00

<109.20

1650.00

546.80

1738.60

338.20

(ppb or ppm)

735.02 ppm

73.27 ppm

405.9 ppb

134.51 ppb

SNOLAB G28

Air Filter Puck

1.103 g

2.958

250321

Mar 21, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Health Canada Air Monitoring Station Filter

122 hours

Mar 24, 2025

(mBq/kg)

2603.00

572.90

<8982.00

<665.10

967.90

522.40

19743.00

4293.00

<294.60

<135.40

250307 – 250312

(ppb or ppm)

210.84 ppb

46.4 ppb

<727.54 ppb

<1170.58 ppb

238.1 ppb

128.51 ppb

637.7 ppm

138.66 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

22Na

(mBq/kg)

5123100.00

536600.00

24745000.00

2565000.00

96.80

123.20

1792.00

638.00

1800.40

386.60

(ppb or ppm)

414.97 ppm

43.46 ppm

440.83 ppb

156.95 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)

(ppb or ppm)