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) |
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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. | ||||||||||||||||||||||||||||||
CUTE Measurements: | ||||||||||||||||||||||||||||||
Sample Description | Manufacturer | Mass (g) | Live Time (days) | Run Numbers | Counting Dates (if applicable) |
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CUTE V01 | CUTE Source SRS-19-003 | 194.0 g | 6.791 | 210120 | Jan 20, 2021 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | ||||||||||||||||
CUTE Fe-55 Calibration Sample | 55-Fe source inside a copper holder | Jan 27, 2021 | (mBq/kg) | <1.44 | <247.60 | 6.19 | +- | 3.94 | 7.23 | +- | 2.44 | 7.67 | +- | 20.01 | <1.56 | 175.30 | +- | 8.40 | ||||||||||||
The source strength is 222 kBq | (ppb or ppm) | <0.12 ppb | <20.06 ppb | 10.9 ppb | +- | 6.94 ppb | 1.78 ppb | +- | 0.6 ppb | 247.71 ppb | +- | 646.32 ppb | ||||||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn: | 228Ac: | 57Co | 58Co | ||||||||||||||||||||||||
(mBq/kg) | <639400.00 | High limit due to large number of 55-Fe X-rays | 5.86 | +- | 9.09 | <2.18 | 4.19 | +- | 4.47 | <53.66 | <1.79 | + large number of X-Rays from 55-Fe | ||||||||||||||||||
(ppb or ppm) | <51.79 ppm | 1.03 ppb | +- | 1.1 ppb | ||||||||||||||||||||||||||
CUTE V02 | Loctite Epoxy by Henkel | 52.3 g | 5.861 | 210415 | Apr 15, 2021 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | ||||||||||||||||
Loctite EA-0151 Epoxy | PN: 398454 | Apr 21, 2021 | (mBq/kg) | <8.65 | <64.10 | <3.01 | <9.01 | <78.76 | <4.56 | <6.37 | ||||||||||||||||||||
Batch No: LB0KAA3587 21/043 | (ppb or ppm) | <0.7 ppb | <5.19 ppb | <5.3 ppb | <2.22 ppb | <2.54 ppm | ||||||||||||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn: | 228Ac: | ||||||||||||||||||||||||||
(mBq/kg) | 897.72 | +- | 981.50 | <74.36 | <6.39 | <27.55 | ||||||||||||||||||||||||
(ppb or ppm) | 72.72 ppb | +- | 79.5 ppb | <6.78 ppb | ||||||||||||||||||||||||||
CUTE V03 | 51.6 g | 7.883 | 240411 | Apr 11, 2024 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||
G10 Plastic Tubes & Inserts | Apr 19, 2024 | (mBq/kg) | 8100.00 | +- | 184.20 | 25000.00 | +- | 1808.00 | 397.20 | +- | 19.02 | 20790.00 | +- | 512.10 | 16364.00 | +- | 950.00 | <26.87 | <14.42 | |||||||||||
(ppb or ppm) | 656.1 ppb | +- | 14.92 ppb | 2.03 ppm | +- | 0.15 ppm | 699.07 ppb | +- | 33.48 ppb | 5.11 ppm | +- | 0.13 ppm | 528.56 ppm | +- | 30.69 ppm | |||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn: | 228Ac: | ||||||||||||||||||||||||||
(mBq/kg) | 30602.00 | +- | 83100.00 | 354.71 | +- | 202.00 | 236.28 | +- | 30.01 | 18730.00 | +- | 476.90 | ||||||||||||||||||
(ppb or ppm) | 2.48 ppm | +- | 6.73 ppm | 4.61 ppm | +- | 0.12 ppm | ||||||||||||||||||||||||
CUTE V04 | 16.9 g | 5.778 | 240419 240425 |
Apr 19, 2024 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||
G10 Plastic Tubes | Apr 25, 2024 | (mBq/kg) | 10710.00 | +- | 323.50 | 39930.00 | +- | 3861.00 | 527.30 | +- | 51.78 | 27360.00 | +- | 793.20 | 22372.00 | +- | 1778.00 | <86.57 | <78.20 | |||||||||||
(ppb or ppm) | 867.51 ppb | +- | 26.2 ppb | 3.23 ppm | +- | 0.31 ppm | 928.05 ppb | +- | 91.13 ppb | 6.73 ppm | +- | 0.2 ppm | 722.62 ppm | +- | 57.43 ppm | |||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn: | 228Ac: | ||||||||||||||||||||||||||
(mBq/kg) | 100830.00 | +- | 253700.00 | <1163.00 | 415.95 | +- | 80.19 | 25420.00 | +- | 812.20 | ||||||||||||||||||||
(ppb or ppm) | 8.17 ppm | +- | 20.55 ppm | 6.25 ppm | +- | 0.2 ppm | ||||||||||||||||||||||||
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) |
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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) |