Research Article
Elemental Analysis and Natural Radioactivity Levels of Clay by Gamma Ray Spectrometer and Instrumental Neutron Activation Analysis
Table 2
Clay composition and the average concentration of the elements calculated using INAA.
| Element | Measured isotope | Half-life (T 1/2) | Energy: (keV) | Average concentration (ppm) | Statistical error (%) |
| Mg% | 27Mg | 9.5 m | 1014 | 5.3 | 6.74 | Na% | 24Na | 15 h | 1369 | 26 | 0.26 | K% | 42K | 12.36 h | 1525 | 6.9 | 6.87 | Ti% | 51Ti | 3.75 m | 320 | 3.71 | 5.68 | Mn% | 56Mn | 2.6 h | 846 | 29 | 1.31 | Fe% | 59Fe | 44.5 d | 1099 | 0.84 | 2.60 | Sc | 46Sc | 38.8 d | 889 | 842 | 0.24 | Cr | 51Cr | 27.7 d | 320 | 274 | 2.40 | Co | 60Co | 5.3 y | 1332 | 3.3 | 0.92 | Zn | 65Zn | 244 d | 115 | 0.1 | 5.80 | Ga | 72Ga | 14.1 h | 834 | 1.18 | 11.63 | As | 76As | 26.3 h | 559 | 219 | 18.66 | Rb | 86Rb | 18.7 d | 1077 | 5.9 | 5.38 | Nb | 95Nb | 34.98 d | 766 | 1 | 2.91 | Sn | 117Sn | 13.6 d | 158 | 15.11 | 20.6 | Ba | 131Ba | 11.8 d | 496 | 0.14 | 9.90 | La | 140La | 40.3 h | 1596 | 183 | 1.48 | Ce | 141Ce | 32.5 d | 145 | 18.4 | 1.76 | Eu | 152Eu | 13.3 y | 1408 | 16.5 | 4.31 | Sm | 153Sm | 46.3 h | 103 | 106 | 0.89 | Yb | 169Yb | 32 d | 198 | 31.3 | 5.34 | Lu | 177Lu | 161 d | 208.4 | 77.4 | 4.69 | Hf | 181Hf | 42.4 d | 428 | 9.8 | 2.60 | Ta | 182Ta | 114.43 d | 1221 | 7.0 | 5.51 | Th | 233Pa | 27 d | 312 | 12.6 | 3.08 | U | 239NP | 2.4 d | 106 | 2.36 | 14.4 |
|
|