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Detailed technical basement of the measurements
| Detector | |
| Type | ORTECGMX 40–76 type HPGe |
| Measuring time | 60,000 s |
| Efficiency | 40% |
| Energy resolution | 1.95 keV at 1332.5 keV |
| Spectrum and data recorder | |
| Type | Tennelec PCA-MR 8196 MCA |
| The measurement of the radionuclides | |
| 40K | By 1461 keV of 40 K |
| 226Ra | By 295 keV of 214Pb and 609 keV of 214Bi |
| 232Th | 911 ke V of 228Ac and 2614 keV of 208Tl |
