The article considers the issues of accounting for dead time when using counting methods for measuring the activity of radionuclides. The description of the principle of operation of the digitizer on the 4pg-counting technique from the primary standard GET 6-2016 is given. The results of the study of the effect of dead time on the determination of the pulse counting rate are presented.The article considers the issues of accounting for dead time when using counting methods for measuring the activity of radionuclides.The article considers the issues of accounting for dead time when using counting methods for measuring the activity of radionuclides. The description of the principle of operation of the digitizer on the 4pg-counting technique from the primary standard GET 6-2016 is given. The results of the study of the effect of dead time on the determination of the pulse counting rate are presented. The description of the principle of operation of the digitizer on the 4pg-counting technique from the primary standard GET 6-2016 is given. The results of the study of the effect of dead time on the determination of the pulse counting rate are presented.

This report contains an overview of possible methods for controlling radioactive substances emissions into the atmosphere by facilities using nuclear energy, and also highlights all the existing problems associated with the implementation of such methods. The author provides an analysis of the applicability for these control methods, depending on the technical equipment f the facility using nuclear energy.

Methodological developments related to the determination of the content of cationic flotation reagents (collectors) based on aliphatic alkoxyamines (Flotigam EDA, Tomamine M-4213, Feiying: TG-928) in technological media and waste of iron ore enrichment processes are considered to ensure the analytical control of technological processes in view of a danger character of generated waste. A spectrophotometric method for determination of cationic amino-containing surfactants can be used for express- and screening analysis. The method of gas chromatography was used to increase the reliability of alkoxyamine measurement and in arbitration cases. The ranges of determinable content for the photometric method in aqueous media were 0.04 – 100 mg/dm3 (extended uncertainty from 20 to 25%) and 3 – 1000 (extended uncertainty from 22 to 30%) in solid media; whereas for gas chromatographic procedure the content ranged within 0.02 – 100 mg/dm3 (extended uncertainty from 20 to 25%) in aqueous media and from 1.0 to 1000 mg/kg (extended uncertainty from 20 to 30%) in solid media, respectively. The methods for determination of the main components, alkoxyamines, in commercial compositions of amine-containing flotation reagents are also presented. The methods have been tested in modeling flotation procedures (to optimize relevant conditions and regimes of real production), certified and included in the Federal State Information System (FSIS) «Arshin».

The problem of the transition of electron shells of atoms to excited states in the process of neutrinoless double-beta decay is investigated. This subject is crucial for modeling the energy spectrum of beta -electrons, which is sensitive to the mass and Majorana nature of neutrinos. The dependence of the obtained results on the atomic number indicates an important role of the Feinberg–Migdal effect in the electron shell excitations. We report the overlap amplitudes of the electron shells of the parent atom and the daughter ion for eleven atoms, the two-neutrino double-beta decay of which was observed experimentally. In around one-fourth of the cases where the structure of the electron shells is inherited from the parent atom, there is a transition to the ground state or the excited state with the lowest energy. The de-excitation of the daughter ion in the latter scenario is accompanied by the emission of photons in the ultraviolet range, which can serve as an auxiliary signature of double-beta decay. The average excitation energy of the electron shells ranges between 300 and 800 eV, with the variance ranging from (1.7 keV)2 in calcium to (14 keV)2 in uranium.

Accurate and reliable measurements of the composition of air environments (workplace air, ambient air, industrial air emissions) form a solid basis for decision making in the area of environmental quality. This article deals with the problem of developing and testing techniques for measuring air quality parameters. The disadvantages of the existing techniques are identified. A methodology for creating appropriate techniques is proposed. Procedures for developing reference materials (RMs) for internal and external quality control of measurement results are described, along with approaches to estimating the metrological characteristics of measurement techniques. The process of applying measurement techniques is specified. It is shown that techniques for measuring air quality parameters may be divided for two basic stages, i. e., the stage of analytical sampling and the stage of measuring the required indicators in this sample. This approach expands the possibilities of developing and certifying such techniques, thereby increasing the reliability of measurement results. Using the developed approach, the authors have successfully developed 12 techniques for measuring air quality parameters and four certified reference materials (CRMs). Works in this direction are continued.

The development of calibration procedures, as well as the certification of readily available reference materials (RMs) and the improvement of their metrological characteristics, are topical issues for thermal analysis methods. In the course of the work, the necessity of conducting a study in order to expand the range of CRMs for temperature and enthalpy of phase transitions is substantiated. The substantiation of the choice of the measurement procedure and starting materials is given. The conditions for conducting experiments are described in detail, and the choice of these conditions is justified. The developed CRMs passed the metrological examination and were included in the Register of approved types of reference materials FIF EUM as a set of certified reference materials for temperature and specific enthalpy of phase transitions (set SOTSF-2) GSO 11890–2022/GSO 11896–2022. The practical significance of the obtained results is as follows: certified reference materials allow expanding the possibility of establishing and monitoring the stability of the calibration characteristics of thermal analysis installations and measuring instruments; certification of measurement procedures (methods) and accuracy control of the measurement results of the phase transition temperature of metals, metal salts, metal oxides, and polymeric materials, organic and inorganic substances.

Electrical steel is a soft magnetic material used in the manufacture of various electrical equipment intended for the transmission and conversion of electricity and used mainly in alternating magnetic fields of industrial frequencies. The key properties of such a material are AC magnetic properties, which are standardized when assessing the compliance of the material with the requirements of both Russian and foreign standards. The article presents information about the aspects of the development of reference materials for AC magnetic properties of electrical cold-rolled non-oriented steel made in the form of strips for the Epstein frame. The main feature of these reference materials is that the value of one of the two certified characteristics (specific power of magnetic losses) is transmitted directly from the State primary standard, and the other (magnetic induction amplitude) is determined in accordance with a certified measurement procedure. Their use will provide the possibility of a comprehensive and reliable determination of the magnetic characteristics of samples of non-oriented electrical steel normalized in accordance with the requirements of current standards.