| 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 | ||||||||||||||||||||||||||||
| The measurements of the samples below take into account the background measurements from the background table. If a measurement is below the background then the upper bound shown is the 90% confidence limit. |
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| CUTE Measurements: | ||||||||||||||||||||||||||||||
| Sample Description | Manufacturer | Mass (g) | Live Time (days) | Run Numbers | Counting Dates (if applicable) |
238U from 226Ra | 238U from 234Th | 235U | 232Th | 228Ac | 137Cs | 210Pb | Comments | |||||||||||||||||
| CUTE CW01 | FA 412 Lead (low activity lead) 1” x 5/8” d |
56.5 g | 13.124 | 19011602 19011702 19012102 |
Jan 16, 2019 | (mBq/kg) | 52.53 | +- | 24.60 | <132.60 | 17.05 | +- | 16.33 | 17.91 | +- | 27.34 | <59.10 | <45.20 | 38748.00 | +- | 2903.00 | |||||||||
| Lead Cylinder | Fonderie de Gentilly | Efficiencies are corrected for self-absorption by the lead using ANGLE4 | Jan 30, 2019 | (ppb or ppm) | 4.25 ppb | +- | 1.99 ppb | <10.74 ppb | 30.01 ppb | +- | 28.74 ppb | 4.41 ppb | +- | 6.73 ppb | <14.54 ppb | 3.14 ppm | +- | 0.24 ppm | ||||||||||||
| CUTE CW02 | TFA 393 Lead (very low activity lead) 1” x 5/8” d |
56.6 g | 15.538 | 190213 190218 |
Feb 13, 2019 | (mBq/kg) | 12.24 | +- | 20.30 | <109.90 | 8.80 | +- | 10.88 | 33.81 | +- | 20.17 | <59.77 | <38.20 | 6294.80 | +- | 1107.00 | |||||||||
| Lead Cylinder | Fonderie de Gentilly | Efficiencies are corrected for self-absorption by the lead using ANGLE4 | Mar 1, 2019 | (ppb or ppm) | 0.99 ppb | +- | 1.64 ppb | <8.9 ppb | 15.49 ppb | +- | 19.15 ppb | 8.32 ppb | +- | 4.96 ppb | <14.7 ppb | 509.88 ppb | +- | 89.67 ppb | ||||||||||||
| In Progress and To Be Measured: | ||||||||||||||||||||||||||||||
| Sample Description | Manufacturer | Mass (g) | Live Time (days) | Run Numbers | Counting Dates (if applicable) |
238U from 226Ra | 238U from 234Th | 235U | 232Th | 228Ac | 137Cs | 210Pb | Comments | |||||||||||||||||
| Next Sample | (mBq) | |||||||||||||||||||||||||||||
| (ppb or ppm) | ||||||||||||||||||||||||||||||