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:


















(mBq) 101.72 +- 20.73 <0.98

<0.12

1.03 +- 0.37











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










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











Completed Sample Measurements Counted on the Vue des Alpes Detector
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.
SBC Measurements:




























Sample Description Manufacturer Mass (g) Live Time (days) Run Numbers Counting Dates
(if applicable)






















SBC V01 Stainless Steel 364.72 g 8.777 210127
210202		 Jan 27, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Pressure Vessel Body


Feb 5, 2021 (mBq/kg) 1.91 +- 1.13 <61.70

0.47 +- 0.43 <2.64

<23.78

0.71 +- 0.68 5.06 +- 0.82

PV Drawing Item #3



(ppb or ppm) 154.63 ppt +- 91.29 ppt <5 ppb

0.83 ppb +- 0.76 ppb <0.65 ppb

<0.77 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 148260.00 +- 118900.00 <7.53

2.84 +- 0.70 <1.76

4.73 +- 1.90 <0.86











(ppb or ppm) 12.01 ppm +- 9.63 ppm





<0.43 ppb











SBC V02 Stainless Steel 254.35 g 6.791 210205
200207		 Feb 5, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Feedthrough Tube for the Pressure Vessel


Feb 12, 2021 (mBq/kg) 3.86 +- 2.03 <67.98

0.34 +- 0.72 4.66 +- 2.15 <34.73

1.09 +- 1.45 1.02 +- 0.82

PV Drawing Item #8



(ppb or ppm) 312.66 ppt +- 164.27 ppt <5.51 ppb

0.6 ppb +- 1.27 ppb 1.15 ppb +- 0.53 ppb <1.12 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 141470.00 +- 129400.00 7.42 +- 8.76 2.40 +- 1.24 <7.34

<2.44

<1.17











(ppb or ppm) 11.46 ppm +- 10.48 ppm





<1.81 ppb












SBC V03 Stainless Steel 189.45 g 11.541 210212
210216		 Feb 12, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Pressure Vessel Spool


Feb 24, 2021 (mBq/kg) 0.94 +- 1.76 126.80 +- 71.45 2.38 +- 0.75 <3.89

<32.52

1.57 +- 1.16 75.03 +- 4.17

PV Drawing Item #6



(ppb or ppm) 0.08 ppb +- 0.14 ppb 10.27 ppb +- 5.79 ppb 4.18 ppb +- 1.31 ppb <0.96 ppb

<1.05 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 122400.00 +- 106900.00 <12.46

6.46 +- 1.47 2.61 +- 3.37 <3.72
<2.38











(ppb or ppm) 9.91 ppm +- 8.66 ppm





0.64 ppb +- 0.83 ppb









SBC V04 Stainless Steel 134.65 g 8.639 210224
210301		 Feb 24, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Pressure Vessel Dome


Mar 5, 2021 (mBq/kg) <3.93

<108.50

<0.74

4.87 +- 2.87 <42.76

<1.27

<1.33



PV Drawing Item #1



(ppb or ppm) <0.32 ppb

<8.79 ppb

<1.3 ppb

1.2 ppb +- 0.71 ppb <1.38 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 74615.00 +- 120200.00 3.12 +- 8.98 4.13 +- 1.37 12.30 +- 4.23 3.75 +- 2.12 <1.59











(ppb or ppm) 6.04 ppm +- 9.74 ppm





3.03 ppb +- 1.04 ppb









SBC V05 Stainless Steel 372.40 g 14.722 210305 Mar 5, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Pressure Relief Pipe


Mar 22, 2021 (mBq/kg) 3.97 +- 1.47 82.29 +- 53.49 0.82 +- 0.62 6.32 +- 1.59 <5.66

<0.80

3.23 +- 0.81






(ppb or ppm) 0.32 ppb +- 0.12 ppb 6.67 ppb +- 4.33 ppb 1.44 ppb +- 1.09 ppb 1.56 ppb +- 0.39 ppb <0.18 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 130530.00 +- 136300.00 <6.77

1.64 +- 0.77 <2.38

<2.28
0.55 +- 0.62









(ppb or ppm) 10.57 ppm +- 11.04 ppm





<0.59 ppb











SBC V06 Silver Plated Bolts 744.9 g 7.182 231228 Dec 28, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Silter Plated Bolts Label: S30400 THE


Jan 5, 2024 (mBq/kg) <1.40

26.97 +- 36.14 0.40 +- 0.39 3.42 +- 1.10 <9.62

<0.50

23.25 +- 1.56

Units: 6



(ppb or ppm) <0.11 ppb

2.18 ppb +- 2.93 ppb 0.71 ppb +- 0.69 ppb 0.84 ppb +- 0.27 ppb <0.31 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 18039.00 +- 20200.00 10.84 +- 5.09 0.83 +- 0.63 2.58 +- 1.83















(ppb or ppm) 1.46 ppm +- 1.64 ppm





0.63 ppb +- 0.45 ppb









SBC V07 PTFE 48.5 g 11.708 240105 Jan 5, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
IA PTFE inner Tower



Jan 17, 2024 (mBq/kg) <4.70

181.10 +- 111.80 <4.56

<5.05

<63.58

<11.23

<2.16








(ppb or ppm) <0.38 ppb

14.67 ppb +- 9.06 ppb <8.03 ppb

<1.24 ppb

<2.05 ppm
















Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 23168.00 +- 13680.00 <40.04

<8.61

<9.43
















(ppb or ppm) 1.88 ppm +- 1.11 ppm





<2.32 ppb











SBC V08
1695.2 g 7.854 240117 Jan 17, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Bellows Flange 8 Pieces


Jan 25, 2024 (mBq/kg) 4.94 +- 0.86 15.12 +- 27.78 0.19 +- 0.38 12.42 +- 1.20 <7.91

<0.59

10.29 +- 0.80






(ppb or ppm) 0.4 ppb +- 0.07 ppb 1.22 ppb +- 2.25 ppb 0.33 ppb +- 0.67 ppb 3.06 ppb +- 0.3 ppb <0.26 ppm















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 14818.00 +- 21610.00 5.07 +- 3.81 0.84 +- 0.48 15.84 +- 1.97 <1.30

0.97 +- 0.45









(ppb or ppm) 1.2 ppm +- 1.75 ppm





3.9 ppb +- 0.48 ppb









SBC V09 Standard Stainles Steel Tubes which are welded together 150.8 g 6.730 240209
240210
24021001		 Feb 9, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Stainless Steel Welded Tubes



Feb 16, 2024 (mBq/kg) <1.61

<73.78

<0.93

4.50 +- 2.51 <21.85

<1.57

6.46 +- 1.51






(ppb or ppm) <0.13 ppb

<5.98 ppb

<1.64 ppb

1.11 ppb +- 0.62 ppb <705.76 ppb
















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) <14390.00

<12.37

2.85 +- 1.39 2.07 +- 3.81 <1.65
<2.51











(ppb or ppm) <1.17 ppm







0.51 ppb +- 0.94 ppb









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)






















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)