The method of active plaque is becoming dominant in the methodology of emanation.

The grading of field logging f-spectrometers is an important but poorly developed issue. Usually it is performed in f-saturated media modeling the conditions of measurements in boreholes.

Gamma-spectral logging to separately determine the concentrations of natural radioactive elements emerged and formed in the USSR as a new radiometric method in the mid-60s. Thanks to the work, s mainly of the radiometric laboratory of the LGI, this method is widely recognized and successfully applied in the prospecting and exploration of radioactive ore deposits. Its main advantages over geological sampling of borehole cores are efficiency, cost-effectiveness, and the possibility to fully investigate a borehole regardless of core recovery. ...

The effective mass attenuation coefficients for gamma radiation of radioactive ores have close values for the integral spectrum measured by a NaI(Tl) scintillator in a standard shield, and for the energy windows used in gamma-spectral logging and ore assaying. ...

Interest in the study of the behavior of K in the hypergenesis zone has become particularly important due to the widespread introduction of gamma-spectrometry into the practice of prospecting for ore deposits, which makes it possible to obtain information on the distribution of K in unconsolidated sediments over large areas and to use these data in various geological-geochemical interpretations. ...

Anomalous changes in concentrations caused by dispersion halos are often comparable in their parameters with fluctuations of the geochemical background and with its changes due to changes in rocks. In these cases, it is necessary to use a method of processing the survey results in which the geochemical background, carrying information about the geological structure or about regional geochemical patterns, is separated from the field of measured concentrations, and local anomalies of prospecting interest are identified.

The logging gamma-spectrometer developed and tested by us contains three counting and decision-making channels providing continuous recording of gamma-radiation-equivalent concentrations of U, Th and K, and an integral channel. The counting and decision-making channels can be used in the mode of continuous or discrete recording of the average pulse rate in the specified energy windows. The counting and decision-making channels can be used in the mode of continuous or discrete recording of the average pulse rate in the specified energy windows. The spectrometer represents a further development of the apparatus [3], designed only for the determination of U and Th. During its creation, the circuit and design of the prototype underwent a radical revision.

In predictive evaluation of ore-bearing areas, the researcher faces two tasks — what to look for and where to look? A fairly clear answer to this can be obtained provided that the entire set of geological, geophysical and geochemical data is used, and the nature of these data and their relative role depend on the stage of the predictive assessment.

Partial escape of radon into the borehole, subjected to prolonged flushing during drilling, leads to a decrease in the intensity of radiation along the borehole axis and an underestimation of linear uranium reserves from gamma logging data.

The most promising method of sampling of uranium-thorium ores, which allows separate determination of uranium and thorium, is the gamma-spectral method in the modification of measurements of the differential effect of radiation. The principle of such sampling was considered earlier. ...

Continuous recording of equivalent contents of radioactive elements instead of registration of count rates in differential channels during gamma-spectral measurements makes it possible to quickly obtain information on the distribution of elements in the studied object and simplify the processing and interpretation of results. This method is used in search gamma-spectral surveys while moving. In our work, continuous recording of uranium (by radium) and thorium contents was used in gamma-spectral logging on the target of two-component uranium-thorium ores.

The different spectral composition of gamma radiation of uranium and thorium ores determines the specifics of accounting for the attenuation of radiation in casing pipes and drilling fluid when interpreting gamma-spectral logs.

Head of the Department of Geochemical and Radioactive Exploration Methods, Professor, Doctor of Geological and Mineralogical Sciences Nikolai Konstantinovich Morozenko was a communist, a major scientist, one of the best experts in the geology of rock crystal deposits and natural riches of Central Asia, Pamir and Altai.

Gamma‑spectrometry is increasingly used in the testing of uranium‑thorium ores. It is based on measurements of pulse count rate in the optimal for uranium and thorium areas of the gamma‑radiation spectrum. One of the main conditions ensuring high sampling accuracy is the correct choice of the gamma‑spectrometer energy windows. This question arises most acutely when creating spectrometric equipment with a small size of scintillators due to the low pulse count rate in the narrow energy windows usually recommended in the literature.

To date, the methods for accounting for emanation in the radiometric analysis and sampling of uranium ores have been developed in sufficient detail. For thorium and uranium-thorium ores these questions are poorly studied, because it is believed that thoron has a short half-life (TTp = 54.5 sec), so it quickly comes into equilibrium with the parent substance ...

The method of accounting for thorium in three gamma ray log interpretations recommended by the existing gamma ray logging manual provides for multiple determinations of thorium in core samples. Samples are analyzed for thorium by gamma ray spectrometry or by chemical and radiochemical methods. The absence in some laboratories of stable scintillation analyzers and in field parties of logging stations that allow reliable separation of uranium and thorium in boreholes forces expensive radiochemical analyses for thorium and radium (due to the need to determine the equilibrium coefficient of uranium and radium).