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

Background Measurements of the Vue des Alpes Detector

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

Background 1

Efficiency assumes no samples

36.187

171213
171218

Dec 13, 2017

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Jan 19, 2018

(mBq)

1.87

0.17

5.04

1.61

0.061

0.052

1.35

0.17

15.26

1.93

0.201

0.096

0.063

0.054

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

76.66

14.04

<0.67

<0.081

0.88

0.26

Background 2

Efficiency assumes no samples

17.497

180212

Feb 12, 2018

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Mar 2, 2018

(mBq)

1.32

0.22

3.73

2.32

0.233

0.076

0.79

0.22

18.39

2.84

0.392

0.159

0.024

0.082

Results:

210Pb:

7Be:

54Mn:

228Ac:

Background 3

Efficiency assumes no samples

51.750

180319
180417

Mar 18, 2018

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

May 12, 2018

(mBq)

2.23

0.15

4.95

1.39

0.140

0.046

1.274

0.133

17.11

1.74

0.433

0.090

<0.068

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

101.15

12.63

0.50

0.55

0.075

0.065

1.21

0.22

Background 4

Efficiency assumes no samples

82.542

180522
18053001
180801

May 22, 2018

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Aug 12, 2018

(mBq)

2.05

0.12

6.24

1.17

0.124

0.034

1.328

0.114

15.52

1.39

0.319

0.067

0.122

0.037

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

79.59

9.88

0.73

0.46

0.040

0.047

1.13

0.18

Background 5

Efficiency assumes no samples

76.532

190910
190914
190915

Sep 10, 2019

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Nov 28, 2019

(mBq)

2.04

0.12

6.37

1.19

0.133

0.035

1.164

0.116

16.22

1.45

0.385

0.076

0.097

0.039

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

82.07

10.15

0.48

0.44

<0.052

1.48

0.19

Background 6

Efficiency assumes no samples

55.304

200324
200430

Mar 24, 2020

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

May 19, 2020

(mBq)

3.40

0.18

7.80

1.57

0.154

0.043

2.40

0.17

29.09

2.38

0.25

0.09

0.032

0.050

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

191.42

21.95

0.49

0.55

0.043

0.060

2.09

0.26

Background 7

Efficiency assumes no samples

7.257

210111
210119

Jan 11, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Jan 20, 2021

(mBq)

2.06

0.38

8.57

3.77

0.22

0.11

1.14

0.37

29.32

5.23

0.36

0.23

<0.12

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

172.52

44.42

<1.55

<0.21

1.73

0.60

Background 8

N/A

67.574

210517
210524
210627
210630

May 17, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Jul 25, 2021

(mBq)

1.91

0.13

4.78

1.19

0.18

0.04

1.28

0.12

19.49

1.70

0.39

0.08

0.032

0.041

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

141.39

16.91

<1.25

<0.061

1.18

0.20

Background 11

N/A

35.762

23092101
230928
230929
23092901
230930
23093001
231001
231003
231008
231012
231014
231018
23101801
231020
231023
231024
231025
231116

Sep 21 –
Oct 26, 2023

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Nov 16- 22, 2023

(mBq)

1.78

0.18

4.95

2.40

0.066

0.054

1.52

0.19

13.04

1.74

0.35

0.12

<0.16

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

153.23

30.36

1.15

0.78

<0.16

1.05

0.32

Background 12

N/A

39.306

240613
240707
240710

Jun 13, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Jul 23, 2024

(mBq)

1.64

0.15

10.95

2.15

0.12

0.05

1.42

0.15

14.15

1.65

0.29

0.10

<0.079

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

177.62

27.67

1.18

0.69

0.059

0.068

0.93

0.25

Combined Background

Combined Backgrounds of Runs 1+2+3+4+5

238.322

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Efficiency assumes no samples

(mBq)

2.414

0.094

6.61

0.85

0.333

0.060

1.534

0.082

18.65

1.22

0.405

0.052

0.151

0.026

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

99.20

7.71

0.32

0.33

0.006

0.034

1.394

0.041

The measurements of the samples below take into account the background measurement shown above. If a measurement is below the background then the upper bound shown is the 90% confidence limit.

In Progress Sample Measurements Counted on the Vue des Alpes Detector

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

Background 13

N/A

13.961

241107
241113

Nov 7, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Completely Empty Detector

Nov 21, 2024

(mBq)

1.13

0.23

12.08

3.73

0.126

0.075

1.10

0.24

6.07

2.22

0.58

0.17

<0.14

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq)

115.11

43.71

0.83

1.12

<0.27

0.51

0.42

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)