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.
QBITS-CUTE Measurements:




























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






















QBITS-CUTE V01 Chalmers University of Technology 220.0 g 13.882 240510 May 10, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Sample Holder Sample #1


May 24, 2024 (mBq/kg) 21.21 +- 1.95 698.20 +- 83.83 23.10 +- 1.28 38.39 +- 2.71 61.42 +- 18.59 <1.74

<0.64








(ppb or ppm) 1.72 ppb +- 0.16 ppb 56.55 ppb +- 6.79 ppb 40.66 ppb +- 2.25 ppb 9.44 ppb +- 0.67 ppb 1.98 ppm +- 0.6 ppm









Also Counted as
PGT QBITS-CUTE 10



Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <60310.00

<9.80

1.16 +- 0.88 42.86 +- 3.81
















(ppb or ppm) <4.89 ppm







10.54 ppb +- 0.94 ppb









QBITS-CUTE V02 Chalmers University of Technology 8.164 g 9.664 240524
250528		 May 24, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Gold Plated Printed Circuit Boards Two Units


Jun 3, 2024 (mBq/kg) 1402.00 +- 65.96 4541.00 +- 888.70 55.72 +- 12.27 1707.00 +- 85.84 762.71 +- 354.10 <22.81

<21.11








(ppb or ppm) 113.56 ppb +- 5.34 ppb 367.82 ppb +- 71.98 ppb 98.07 ppb +- 21.6 ppb 419.92 ppb +- 21.12 ppb 24.64 ppm +- 11.44 ppm









Also Counted as
PGT QBITS-CUTE 08



Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <100700.00

192.58 +- 150.10 47.06 +- 19.42 1765.00 +- 111.50
















(ppb or ppm) <8.16 ppm







434.19 ppb +- 27.43 ppb









QBITS-CUTE V03 Chalmers University of Technology 7.835 g 9.983 240603 Jun 3, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
PCB ELCO Bluefors: Elco BV, Hofsttetter, EPIG Plating


Jun 13, 2024 (mBq/kg) 1364.00 +- 66.03 3541.00 +- 687.60 66.78 +- 12.65 2130.00 +- 98.61 1408.10 +- 390.10 12.08 +- 22.57 <17.10



Sample #3
2 units



(ppb or ppm) 110.48 ppb +- 5.35 ppb 286.82 ppb +- 55.7 ppb 117.53 ppb +- 22.26 ppb 523.98 ppb +- 24.26 ppb 45.48 ppm +- 12.6 ppm









Also Counted as
PGT QBITS-CUTE 11



Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 46030.00 +- 49530.00 <134.80

46.20 +- 20.03 1799.00 +- 114.10
















(ppb or ppm) 3.73 ppm +- 4.01 ppm





442.55 ppb +- 28.07 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


Queue Empty:
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)