| 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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| DAMIC 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 | |||||||||||||||||
| DAMIC CW01 | Epotek 301-2FL two-part epoxy | 4.5 g | 9.042 | 140318 | Mar 18, 2014 | (mBq/kg) | 1.50 | +- | 50.24 | 11.11 | +- | 31.43 | 13.29 | +- | 9.25 | 24.47 | +- | 43.98 | <63.49 | <496.84 | <269.47 | |||||||||
| Epoxy | Epoxy Technology, Billerica, Mass, USA | Also DAMIC 7 | Mar 27, 2014 | (ppb or ppm) | 0.12 ppb | +- | 4.07 ppb | 0.90 ppb | +- | 2.45 ppb | 23.39 ppb | +- | 16.28 ppb | 6.02 ppb | +- | 10.82 ppb | <15.62 ppb | |||||||||||||
| DAMIC CW02 | Ametek Engineered Materials SDN BHD | 11.6 g | 13.575 | 190513 190523 19052301 19052 |
May 13, 2019 | (mBq/kg) | 5.24 | +- | 19.83 | 240.90 | +- | 31.40 | 24.70 | +- | 5.17 | 205.90 | +- | 30.81 | 55.94 | +- | 38.67 | <161.40 | 92.46 | +- | 50.45 | 40K: | <9865.00 | |||
| Aluminum Rod (with 1% Silicon) | May 27, 2019 | (ppb or ppm) | 0.42 ppb | +- | 1.61 ppb | 19.51 ppb | +- | 2.54 ppb | 43.47 ppb | +- | 9.1 ppb | 50.65 ppb | +- | 7.58 ppb | 13.76 ppb | +- | 9.51 ppb | 7.49 ppb | +- | 4.09 ppb | <318.64 ppm | |||||||||
| 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/kg) | |||||||||||||||||||||||||||||
| (ppb or ppm) | ||||||||||||||||||||||||||||||