类别 | 核素 | 能量E(KeV) | 反应几率η | ||||
天然地层 | 钾矿层 | 钍矿层 | 铀矿层 | 混合矿层 | |||
钾 | 40K | 1460 | 0.01755 | 0.33659 | 0.01603 | 0.03816 | 0.19081 |
铀系 | 238U | 48 | 0.00004 | 0.00011 | 0.00018 | 0.00402 | 0.00133 |
234Th | 29 |
|
|
|
|
| |
64 | 0.00217 | 0.00574 | 0.00981 | 0.21318 | 0.07034 | ||
93 | 0.00126 | 0.00334 | 0.00570 | 0.12387 | 0.04087 | ||
214Pb | 242 | 0.00426 | 0.01129 | 0.01927 | 0.41886 | 0.13821 | |
|
|
|
|
|
| ||
295 | 0.01080 | 0.02858 | 0.04879 | 1.06070 | 0.35000 | ||
352 | 0.02073 | 0.05487 | 0.09365 | 2.03613 | 0.67187 | ||
214Bi | 609 | 0.02649 | 0.07012 | 0.11968 | 2.60191 | 0.85856 | |
769 | 0.00285 | 0.00753 | 0.01285 | 0.27943 | 0.09221 | ||
1120 | 0.00867 | 0.02295 | 0.03917 | 0.85155 | 0.28099 | ||
1378 | 0.00232 | 0.00613 | 0.01047 | 0.22758 | 0.07510 | ||
1408 | 0.00139 | 0.00368 | 0.00628 | 0.13655 | 0.04506 | ||
1760 | 0.00890 | 0.02355 | 0.04020 | 0.87402 | 0.28840 | ||
2204 | 0.00287 | 0.00759 | 0.01296 | 0.28174 | 0.09297 | ||
钍系 | 232Th | 64 | 0.00007 | 0.00022 | 0.00948 | 0.00027 | 0.00479 |
228Ac | 58 | 0.00012 | 0.00040 | 0.01721 | 0.00049 | 0.00870 | |
129 | 0.00066 | 0.00212 | 0.09153 | 0.00262 | 0.04625 | ||
338 | 0.00299 | 0.00967 | 0.41738 | 0.01195 | 0.21092 | ||
795 | 0.00113 | 0.00365 | 0.15780 | 0.00452 | 0.07974 | ||
|
| 911 | 0.00687 | 0.02221 | 0.95925 | 0.02746 | 0.48475 |
969 | 0.00417 | 0.01348 | 0.58214 | 0.01667 | 0.29418 | ||
212Bi | 727 | 0.00177 | 0.00571 | 0.24677 | 0.00706 | 0.12470 | |
224Ra | 241 | 0.00108 | 0.00349 | 0.15084 | 0.00432 | 0.07623 | |
208Tl | 511 | 0.00590 | 0.01908 | 0.82378 | 0.02358 | 0.41629 | |
583 | 0.02229 | 0.07207 | 3.11208 | 0.08909 | 1.57266 | ||
2615 | 0.00940 | 0.03040 | 1.31256 | 0.03758 | 0.66329 | ||
212Pb | 239 | 0.01143 | 0.03697 | 1.59631 | 0.04570 | 0.80668 | |
300 | 0.00083 | 0.00270 | 0.11643 | 0.00333 | 0.05884 |