| 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 | |||||||||||||||||||||||||||
| The measurements of the samples below take into account the background measurement. If a measurement is below the background then the upper bound shown is the 90% confidence limit. | |||||||||||||||||||||||||||||
| DRIFT Measurements: | |||||||||||||||||||||||||||||
| Sample Description | Manufacturer | Mass (g) | Live Time (days) | Counting Dates (if applicable) |
238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||
| DRIFT 1 | Astral Technology Unlimited Lot# 15-2913 |
2.1 g | 4.423 | Dec 14, 2011 | (mBq/kg) | 223.83 | +- | 319.79 | 26476.19 | +- | 19190.48 | <211.82 | <109.56 | <4056.00 | <366.29 | <168.22 | 210Po: | ||||||||||||
| Aluminized Mylar | Mylar is polyethylene terephthalate polyester | Dec 19, 2011 | (ppb or ppm) | 18.13 ppb | +- | 25.80 ppb | 2.14 ppm | +- | 1.55 ppm | <372.79 ppb | <26.95 ppb | <131.01 ppm | <507.10 Bq/kg | ||||||||||||||||
| DRIFT 2 | Astral Technology Unlimited | 3.3 g | 6.654 | Jan 4, 2012 | (mBq/kg) | 174.94 | +- | 147.38 | <3023.82 | 37.93 | +- | 148.77 | 40.93 | +- | 147.83 | <1345.70 | 212.12 | +- | 151.52 | <68.99 | 210Po: | ||||||||
| Pure Mylar | Mylar is polyethylene terephthalate polyester | Jan 11, 2012 | (ppb or ppm) | 14.17 ppb | +- | 11.94 ppb | <244.93 ppb | 66.75 ppb | +- | 261.83 ppb | 10.07 ppb | +- | 28.46 ppb | <43.47 ppm | <683.36 Bq/kg | ||||||||||||||
| In Progress and To Be Measured: | |||||||||||||||||||||||||||||
| Sample Description | Manufacturer | Mass (g) | Live Time (days) | Counting Dates (if applicable) |
238U from 226Ra | 238U from 234Th | 235U | 232Th | 40K | 137Cs | 60Co | Comments | |||||||||||||||||
| (mBq/kg) | |||||||||||||||||||||||||||||
| (ppb or ppm) | |||||||||||||||||||||||||||||