Complex betwe-gamma analysis is used to determine U and Ra in powder samples of nonequilibrium uranium ores.

Serially produced radiometric and nuclear geophysical spectrometers with rare exceptions contain one or two measuring differential channels, which complicates research and does not provide high labor productivity. As experience of geophysical works shows, radiometric spectrometer should have at least three independent differential channels, nuclear geophysical spectrometer - three-four, and sometimes more channels.

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

The logging gamma-spectrometer developed and tested by us contains three counting-resolving channels providing continuous recording of gamma equivalent concentrations of U, Tb and K, and an integral channel. The counting-resolving channels can be used in the mode of continuous or discrete recording of the average pulse frequency in specified energy windows ...

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

The electronic energy scale stabilization circuit is a device that monitors the photopeak of a gamma ray repeater. The basis of the scheme are two adjacent differential channels with the same window width, tuned, respectively, to the left and right branches of the photopeak of the reference source. At the output of both differential channels is placed a comparison circuit and an actuator...

Semiconductor diodes and triodes are widely used in the practice of geophysical instrumentation, which allow to significantly increase the efficiency, reduce the size and weight of the equipment. However, semiconductor devices, having high performance qualities, at the modern level of production technology are characterized by a scatter of parameters. Therefore, when designing critical nodes of equipment it is necessary to select diodes and especially triodes according to their electrical properties. The most complete idea about amplifying properties of transistors gives the analysis of their output characteristics. Since the process of taking characteristics by points is labor-intensive, there are devices that allow visual observation of the output characteristics of transistors on the oscilloscope screen. Such devices are made in the USSR and abroad in various modifications depending on the range of solved tasks and the required accuracy of observations. Relatively universal units have a complex electronic circuit, simpler ones, as a rule, provide the possibility of only qualitative assessment of amplifying properties of transistors ...