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: | 234Th: 63.29 and 92.59 keV 226Ra: 186.1 keV |
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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: 277.371, 583.19, 860.557 and 2614.53 keV, | ||||||||||||||||||||||||||||||
228Ac: 209.253, 338.320, 463,004, 911.21, 964.766 and 968.971 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 runs for the Lively Detector | ||||||||||||||||||||||||||||||
If a measurement in the signal region is below the sideband regions then the 90% confidence limit is calculated. | ||||||||||||||||||||||||||||||
Sample Description | Manufacturer | Mass (g) | Live Time (days) | Run Numbers | Counting Dates (if applicable) |
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Background 1 | 171.327 | Mar 29, 2019 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||||
Completely Empty Detector | Jan 20, 2020 | (mBq) | 1.201 | +- | 0.053 | 2.58 | +- | 0.40 | 0.110 | +- | 0.015 | 1.074 | +- | 0.058 | 4.97 | +- | 0.45 | 0.024 | +- | 0.021 | 0.118 | +- | 0.018 | |||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | 210Po: | |||||||||||||||||||||||||
(mBq) | 289.25 | +- | 31.53 | <0.26 | 0.024 | +- | 0.021 | 1.305 | +- | 0.099 | <2629.00 | |||||||||||||||||||
Background 2 | 55.461 | 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) | 1.243 | +- | 0.083 | 3.02 | +- | 0.86 | 0.161 | +- | 0.029 | 1.38 | +- | 0.10 | 8.35 | +- | 0.94 | <0.043 | 0.111 | +- | 0.031 | |||||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | 210Po: | |||||||||||||||||||||||||
(mBq) | 554.52 | +- | 80.36 | 0.74 | +- | 0.30 | 0.020 | +- | 0.035 | 2.22 | +- | 0.18 | <4463.00 | |||||||||||||||||
Combined Background | Combined Backgrounds of runs CW1 | 171.327 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||||
(mBq) | 1.201 | +- | 0.053 | 2.58 | +- | 0.40 | 0.110 | +- | 0.015 | 1.074 | +- | 0.058 | 4.97 | +- | 0.45 | 0.024 | +- | 0.021 | 0.118 | +- | 0.018 | |||||||||
Completely Empty Detector | ||||||||||||||||||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | 210Po: | |||||||||||||||||||||||||
(mBq) | 289.25 | +- | 31.53 | <0.26 | 0.024 | +- | 0.021 | 1.305 | +- | 0.099 | <2629.00 | |||||||||||||||||||
Completed Sample Measurements for the Lively Detector | ||||||||||||||||||||||||||||||
DEAP Measurements: | ||||||||||||||||||||||||||||||
Sample Description | Mass (g) | Live Time (days) | Run Numbers | Counting Dates (if applicable) |
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DEAP L01 | Scientific Polymer Products Inc. | 1013.1 g | 8.791 | 210322 | Mar 22, 2021 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | ||||||||||||||||
Polystyrene Beads | Bimodal Polymer Cat #400 CAS# 9003-53-6 |
Mar 31, 2021 | (mBq/kg) | 0.36 | +- | 0.37 | 29.79 | +- | 9.50 | 0.26 | +- | 0.17 | <0.68 | 4.97 | +- | 3.33 | 0.25 | +- | 0.22 | <0.16 | ||||||||||
(ppm / ppb / ppt) | 29.11 ppt | +- | 30.09 ppt | 2.41 ppb | +- | 0.77 ppb | 0.46 ppb | +- | 0.3 ppb | <0.17 ppb | 160.41 ppb | +- | 107.53 ppb | |||||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | ||||||||||||||||||||||||||
(mBq/kg) | 689.81 | +- | 393.50 | 5.69 | +- | 2.03 | 0.02 | +- | 0.16 | 1.73 | +- | 0.74 | ||||||||||||||||||
(ppm / ppb / ppt) | 55.87 ppb | +- | 31.87 ppb | 0.43 ppb | +- | 0.18 ppb | ||||||||||||||||||||||||
DEAP L02 | Scientific Polymer Products Inc. | 1011.1 g | 25.442 | 210421 210429 |
Apr 21, 2021 | Results: | 238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | ||||||||||||||||
Polystyrene Beads | Bimodal Polymer Cat #400 CAS# 9003-53-6 |
May 17, 2021 | (mBq/kg) | 0.26 | +- | 0.23 | 8.69 | +- | 5.24 | 0.22 | +- | 0.10 | 0.36 | +- | 0.27 | <4.66 | <0.090 | <0.14 | ||||||||||||
U/S Cleaned | These are the same beads as L01, but they have been U/S cleaned | (ppm / ppb / ppt) | 20.71 ppt | +- | 18.61 ppt | 0.7 ppb | +- | 0.42 ppb | 0.38 ppb | +- | 0.17 ppb | 88.36 ppt | +- | 67.35 ppt | <150.52 ppb | |||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | ||||||||||||||||||||||||||
(mBq/kg) | <228.40 | 1.20 | +- | 0.98 | <0.095 | 0.73 | +- | 0.44 | ||||||||||||||||||||||
(ppm / ppb / ppt) | <18.5 ppb | 180.59 ppt | +- | 109.3 ppt | ||||||||||||||||||||||||||
In Progress Sample Measurements for the Lively Detector | ||||||||||||||||||||||||||||||
Runs in Progress: | ||||||||||||||||||||||||||||||
Sample Description | 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) | ||||||||||||||||||||||||||||||
(ppm / ppb / ppt) | . | |||||||||||||||||||||||||||||
Results: | 210Pb: | 7Be: | 54Mn | 228Ac: | 210Po: | |||||||||||||||||||||||||
(mBq/kg) | ||||||||||||||||||||||||||||||
(ppm / ppb / ppt) |