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.

SBC Measurements:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Counting Dates
(if applicable)

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

SBC P01

Durable V2
PN: 20191204JS

992.3 g

21.437

Mar 2, 2020

(mBq/kg)

0.89

0.31

<9.12

<0.25

<0.32

<4.07

0.20

0.34

<0.083

Formlabs Photopolymer Resin

Formlabs Inc
Sommerville, MA

Mar 24, 2020

(ppb or ppm)

72.09 ppt

25.03 ppt

<0.74 ppb

<0.44 ppb

<78.72 ppt

<131.46 ppb

SBC P02

SiPMs labelled 96 & 97

2.6 g

19.770

Jun 10, 2020

(mBq/kg)

31010.00

853.20

38690.00

4301.00

1616.00

80.49

7056.00

266.60

381.71

894.60

<64.48

<82.33

Hamamatsu VUV4 Quad SiPM (MEG-II Style)

The SiPMs were cleaned and baked at lower temperature for 6 hours

(2 SiPMs)

Jun 30, 2020

(ppb or ppm)

2511.81 ppb

69.11 ppb

3133.89 ppb

348.38 ppb

2844.16 ppb

141.66 ppb

1735.78 ppb

65.58 ppb

12.33 ppm

28.9 ppm

Previously counted as SBC CW01

(mBq / SiPM)

40.31

1.11

50.30

5.59

2.10

0.10

9.17

0.35

SBC P03

UCTRONICS (http://uctronics.com )

2.1 g

19.374

Jul 22, 2020

(mBq/kg)

1652.00

118.50

1469.00

1882.00

75.80

38.85

2535.00

141.30

3340.20

907.70

<82.75

7.29

30.48

Cameras

Part number: U6072

2 Cameras
1.05 g / camera

Aug 11, 2020

(ppb or ppm)

133.81 ppb

9.6 ppb

118.99 ppb

152.44 ppb

133.41 ppb

68.38 ppb

623.61 ppb

34.76 ppb

107.89 ppm

29.32 ppm

SBC P04

B&H Photo (http://bhphotovideo.com )

42.2 g

2.812

Aug 25, 2020

(mBq/kg)

5053.00

224.30

3622.00

4125.00

213.30

54.27

736.20

102.50

147700.00

8409.00

<190.60

<101.10

Wide Angle Lenses

Part number: COE1628KRY

4 Lenses/ 10.8 g per lens

Aug 28, 2020

(ppb or ppm)

409.29 ppb

18.17 ppb

293.38 ppb

334.13 ppb

375.41 ppb

95.52 ppb

181.11 ppb

25.22 ppb

4770.71 ppm

271.61 ppm

Additional Activities:

(mBq/kg)

138La:

111800.00

4135.00

227Ac:

8139.00

428.60

(ppb or ppm)

(Not in Equilibrium with upper part of the U-235 chain)

14324.64 ppb

754.34 ppb

SBC P05

UCTRONICS (http://uctronics.com )

8.1 g

12.826

Aug 28, 2020

(mBq/kg)

1407.00

69.40

9469.00

1520.00

179.30

20.53

711.50

51.34

271.36

315.50

29.35

25.96

<19.19

Normal Lenses used on U6072 Camera

M12 Mount Low Distortion Lens
Model No: M27280M07S

2 Lenses/ 4.05 g / lens

Sep 10, 2020

(ppb or ppm)

113.97 ppb

5.62 ppb

766.99 ppb

123.12 ppb

315.57 ppb

36.13 ppb

175.03 ppb

12.63 ppb

8.76 ppm

10.19 ppm

SBC P06

Dimensions: 1"x0.8"x1.3"
Type: NOPC155–25

20.35 g

13.555

Aug 11, 2020

(mBq/kg)

0.04

9.81

127.00

257.80

1.78

5.27

<10.47

<159.40

<10.48

<1.71

Nanoguide

Incom, Charlton, MA 01507

Aug 25, 2020

(ppb or ppm)

3.18 ppt

794.37 ppt

10.29 ppb

20.88 ppb

3.14 ppb

9.28 ppb

<2.58 ppb

<5.15 ppm

SBC P07

Black polyimide (Kapton) film

29.0 g

11.632

Feb 12, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Black Kapton Tape

Type: PIT1N-Black 25.4
Lot#: LN-CA2013003S1/F1

Feb 24, 2021

(mBq/kg)

373.60

21.87

<547.90

14.65

6.02

177.20

18.85

415.94

134.20

<13.97

<1.81

Caplinq Corporation
Ottawa, On

Runs:
210212
210216

(ppm / ppb / ppt)

30.26 ppb

1.77 ppb

<44.38 ppb

25.78 ppb

10.6 ppb

43.59 ppb

4.64 ppb

13.43 ppm

4.33 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

<55.03

<6.55

144.10

26.28

(ppm / ppb / ppt)

35.45 ppb

6.46 ppb

SBC P08

Tungsten Electrodes EWG ANSI/AWS A5.12

45.43 g

8.632

Feb 24, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Blue Demon Welding Electrodes

P/N: TEMM-116-10T
Type: Multi-Mix
Lot # WG0016175-140423-8803B

Mar 5, 2021

(mBq/kg)

174.60

37.26

<2287.00

<46.49

5227.00

175.00

579.68

180.90

15.40

26.84

<16.13

7 rods, each rod is 1/16” diameter x 7” long

Runs:
210224
210225
210301

(ppm / ppb / ppt)

14.14 ppb

3.02 ppb

<185.25 ppb

<81.82 ppb

1.29 ppm

0.04 ppm

18.72 ppm

5.84 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

207.01

213.20

102.91

24.42

6442.00

243.90

(ppm / ppb / ppt)

1.58 ppm

0.06 ppm

SBC P09

Kester Lead-Free Solder

110.0 g

16.736

Mar 5, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Tin-Silver Solder

Solder: Sn 96.5%
Sg: 3.0%
Cu: 05%

Mar 22, 2021

(mBq/kg)

<3.42

146.70

112.10

<9.51

3.41

4.59

87.11

31.48

<3.50

<0.43

Lot: W201038
PN: 2470686403
Solder diameter: 0.8 mm

Runs: 210305

(ppm / ppb / ppt)

<0.28 ppb

11.88 ppb

9.08 ppb

<16.74 ppb

0.84 ppb

1.13 ppb

3 ppm

1.02 ppm

Results:

7Be:

54Mn

228Ac:

57Co

58Co

Kester
Itaska, IL, USA

(mBq/kg)

10.99

23.24

<1.57

5.22

3.86

<60.37

<0.81

(ppm / ppb / ppt)

1.28 ppb

0.95 ppb

SBC P10

8 RTDs

38.4 g

6.798

Sep 3, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

RTD Mounting Sets

Each RTD is epoxied onto a small copper mounting bar

Sep 10, 2021

(mBq/kg)

310.40

21.60

1089.00

543.30

12.66

6.75

557.00

33.16

728.31

147.80

<11.55

0.28

4.41

Runs:
210903

(ppm / ppb / ppt)

25.14 ppb

1.75 ppb

88.21 ppb

44.01 ppb

22.28 ppb

11.88 ppb

137.02 ppb

8.16 ppb

23.52 ppm

4.77 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

145.66

71.94

17.91

7.854

610.80

48.38

(ppm / ppb / ppt)

150.26 ppb

11.9 ppb

SBC P11

Garnet Cutting Media

688.5 g

7.622

Dec 28, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Garnet Cutting Media

Jan 5, 2024

(mBq/kg)

38330.00

725.10

43710.00

2735.00

1805.00

49.97

31100.00

753.90

8570.60

491.60

N/A

<24.36

Runs:
231228

(ppm / ppb / ppt)

3.1 ppm

0.06 ppm

3.54 ppm

0.22 ppm

3.18 ppm

0.09 ppm

7.65 ppm

0.19 ppm

277 ppm

15.88 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

707.19

221.50

344.30

28.97

27120.00

694.70

(ppm / ppb / ppt)

6.67 ppm

0.17 ppm

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Counting Dates
(if applicable)

Next Sample

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

(mBq/kg)

(ppm / ppb / ppt)

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

(ppm / ppb / ppt)