| 摘要 |
Method and apparatus for evaluating the rare metal content of a natural geological formation, wherein neutrons are emitted into the geological formation, the gamma radiation providing from elements activated by the neutrons is collected on a detector producing output pulses representative of the energy of the received gamma radiation, an energy histogram of the gamma radiation is formed by multi-channel analysis, activation peaks characteristic of high intensity of at least one rich spectrum reference element associated with the nature of the searched rare metal or of the rare metal itself as long as it has a rich spectrum are searched for, the count output of the pulses in relation to the energy is deduced from the identification of the peaks of said reference element and from the intensity thereof, one or a plurality of lines of said rare metal are located and the contribution of said rare metal to the counting rate at said location is searched for. |
