200,000 second background - 0 - 200 keVHome Page | Examples Page | 200 - 700 keV | 700 - 1200 keV | 1200-2000 keV
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| This spectrum was measured using a 45% n-type detector, mounted in a standard 10cm thick cylindrical graded shield, in a routine laboratory at typical altitude with no special background suppression facilities.
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| Measured Energy (keV) | True Energy (keV) | Peak Counts | Nuclide | Emission Probability (%) | Source of radiation | |
| 1 | 12.68 | 12.56 | 8407 | 212Pb | 14.5 | 232Th series |
| 12.75 | 228Ra | 0.3 | 232Th series | |||
| 12.89 | 214Pb | 12.42 | 238U series (226Ra) | |||
| 12.9 | 210Pb | 23.2 | 238U series (226Ra) | |||
| 12.94 | 212Bi | 0.0581 | 232Th series | |||
| 12.94 | 214Bi | 0.627 | 238U series (226Ra) | |||
| 2 | 15.98 | 15.75 | 13211 | 235U | 51 | Primordial |
| 15.75 | 228Ac | 32.9 | 232Th series | |||
| 16.2 | 228Ra | 0.7 | 232Th series | |||
| 3 | 19.14 | 20.02 | 2876 | 234Th | 0.009 | 238U series |
| 20.25 | 227Th | 0.23 | 235U series | |||
| 4 | 24.08 | 24.13 | 735 | 227Th | 0.086 | 235U series |
| 5 | 25.62 | 25.27 | 743 | ?? | 45.7 | Unidentified |
| 6 | 46.5 | 46.54 | 3068 | 210Pb | 4.25 | 238U series (226Ra) |
| 7 | 49.43 | 49.55 | 186 | 238U | 0.0697 | Primordial |
| 8 | 53.11 | 53.23 | 751 | 214Pb | 1.06 | 238U series (226Ra) |
| 53.44 | 73mGe | 10.34 | 72Ge(n,g), 74Ge(n,2n) | |||
| 9 | 63.32 | 63.28 | 6667 | 234Th | 4.8 | 238U series |
| 10 | 72.82 | 72.8 | 1410 | 208Tl | 2.15 | 232Th series |
| 72.87 | 212Bi | 0.095 | 232Th series | |||
| 11 | 74.92 | 74.82 | 5980 | 214Pb | 6.26 | 238U series (226Ra) |
| 74.82 | 212Pb | 10.7 | 232Th series | |||
| 74.97 | 208Tl | 3.61 | 232Th series | |||
| 12 | 77.18 | 76.86 | 6704 | 212Bi | 0.0404 | 232Th series |
| 76.86 | 214Bi | 0.426 | 238U series (226Ra) | |||
| 77.11 | 214Pb | 10.47 | 238U series (226Ra) | |||
| 77.11 | 212Pb | 17.9 | 232Th series | |||
| 77.34 | 228Ac | 0.026 | 232Th series | |||
| 13 | 79.43 | 79.29 | 372 | 214Bi | 0.709 | 238U series (226Ra) |
| 79.29 | 219Ra | 0.89 | 235U series | |||
| 79.29 | 212Bi | 0.0672 | 232Th series | |||
| 79.69 | 227Th | 1.9 | 235U series | |||
| 14 | 81.29 | 81.07 | 296 | 223Ra | 15 | 235U series |
| 81.07 | 224Ra | 0.13 | 232Th series | |||
| 81.07 | 226Ra | 0.192 | 238U series (226Ra) | |||
| 81.07 | 228Ra | 1.76 | 232Th series | |||
| 15 | 84.5 | 84.37 | 2088 | 228Th | 1.17 | 232Th series |
| 84.95 | 208Tl | 1.23 | 232Th series | |||
| 16 | 87.35 | 87.02 | 2330 | 234Th | 0.018 | 238U series |
| 87.35 | 214Pb | 3.59 | 238U series (226Ra) | |||
| 87.35 | 212Pb | 6.12 | 232Th series | |||
| 87.58 | 208Tl | 0.373 | 232Th series | |||
| 17 | 89.96 | 89.75 | 1146 | 212Bi | 0.0231 | 232Th series |
| 89.95 | 214Bi | 0.244 | 238U series (226Ra) | |||
| 89.95 | 235U | 3.56 | Primordial | |||
| 89.95 | 228Ac | 0.931 | 232Th series | |||
| 90.08 | 214Pb | 1.1 | 238U series (226Ra) | |||
| 90.14 | 212Pb | 1.87 | 232Th series | |||
| 18 | 92.59 | 92.37 | 8763 | 234Th | 2.81 | 238U series |
| 92.64 | 214Bi | 0.076 | 238U series (226Ra) | |||
| 92.68 | 212Bi | 0.0072 | 232Th series | |||
| 92.79 | 234Th | 2.77 | 238U series | |||
| 19 | 98.88 | 98.44 | 766 | 234mPa | 0.233 | 238U series |
| 20 | 105.75 | 105.55 | 235U | 2.08 | Primordial | |
| 105.55 | 228Ac | 0.536 | 232Th series | |||
| 21 | 112.87 | 112.81 | 634 | 234Th | 0.28 | 238U series |
| 22 | 129.15 | 129.06 | 653 | 228Ac | 2.42 | 232Th series |
| 23 | 143.95 | 143.76 | 785 | 235U | 10.96 | Primordial |
| 143.87 | 230Th | 0.049 | 238U series | |||
| 144.23 | 223Ra | 3.22 | 235U series | |||
| 24 | 163.6 | 163.33 | 557 | 235U | 5.08 | Primordial |
| 25 | 185.93 | 185.72 | 5163 | 235U | 57.2 | Primordial |
| 186.05 | 230Th | 0.0088 | 238U series | |||
| 186.21 | 226Ra | 3.555 | 238U series (226Ra) | |||
| 26 | 198.66 | 198.39 | 476 | 71mGe | 1 | 70Ge(n,g activation (summed) |
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