200,000 second background - 200 - 700 keVHome Page | Examples Page | 0 - 200 keV | 700 - 1200 keV | 1200 - 200 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 | 205.37 | 205.31 | 484 | 235U | 5.01 | Primordial |
| 205.68 | 214Pb | 0.0114 | 238U series (226Ra) | |||
| 2 | 209.4 | 209.26 | 879 | 228Ac | 3.89 | 232Th series |
| 3 | 238.62 | 238.63 | 8413 | 212Pb | 43.6 | 232Th series |
| 4 | 240.76 | 240.99 | 636 | 220Ra | 4.12 | 235U series |
| 240.99 | 224Ra | 4.12 | 232Th series | |||
| 5 | 241.91 | 242 | 1648 | 214Pb | 7.268 | 238U series (226Ra) |
| 6 | 269.4 | 268.8 | 213 | 214Bi | 0.0161 | 238U series (226Ra) |
| 269.46 | 223Ra | 13.7 | 235U series | |||
| 7 | 270.27 | 270.24 | 597 | 228Ac | 3.46 | 232Th series |
| 8 | 277.61 | 277.37 | 402 | 208Tl | 6.6 | 232Th series |
| 9 | 295.35 | 295.22 | 3588 | 214Pb | 18.5 | 238U series (226Ra) |
| 10 | 300.4 | 299.98 | 545 | 227Th | 2.16 | 235U series |
| 300.09 | 212Pb | 3.18 | 232Th series | |||
| 11 | 327.99 | 327.44 | 388 | 228Ac | 0.12 | 232Th series |
| 327.94 | 212Bi | 0.121 | 232Th series | |||
| 328 | 228Ac | 2.95 | 232Th series | |||
| 12 | 338.48 | 338.28 | 1672 | 223Ra | 2.79 | 235U series |
| 338.32 | 228Ac | 11.27 | 232Th series | |||
| 13 | 352.05 | 351.93 | 5877 | 214Pb | 35.6 | 238U series (226Ra) |
| 14 | 409.59 | 409.46 | 427 | 228Ac | 1.92 | 232Th series |
| 15 | 463.14 | 463 | 793 | 228Ac | 4.4 | 232Th series |
| 16 | 511.15 | 510.7 | 7048 | 208Tl | 22.6 | 232Th series |
| 17 | 558.39 | 558.46 | 331 | 114*Cd | 1 | 113Cd(n,g) prompt g |
| 18 | 570.15 | 569.7 | 349 | 207mPb | 97.87 | 207Pb(n,n') |
| 570.82 | 228Ac | 0.182 | 232Th series | |||
| 19 | 583.45 | 583.19 | 2900 | 208Tl | 85 | 232Th series |
| 583.41 | 228Ac | 0.111 | 232Th series | |||
| 20 | 609.51 | 609.31 | 4969 | 214Bi | 45.49 | 238U series (226Ra) |
| 21 | 661.88 | 661.1 | 263 | 214Bi | 0.0537 | 238U series (226Ra) |
| 661.66 | 137Cs | 84.99 | fission |
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