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The past decade has been characterized by the rapid development of individual XRF variants. Advances in capillary optics and micro‐XRF have been noted. A few new models of XRF spectrometers have been constructed which use polycapillary lenses and half lenses as collimating systems [32–36]. This is especially important in the case of the use of X‐ray fluorescence for detection of certain elements in vivo in bones, tissues, and individual organs. Dynamic development is typical for thermoelectrically‐cooled detectors [33, 36], TXRF [37–40] and spectrometers with polarized radiation [41–44]. Convenient portable spectrometers are widely used for analysis of various samples, including plant materials [45–50].

The publications reviewed set out versions for the use of the following models XRF spectrometers: the multichannel spectrometer of SRM‐25 (USSR), scanning X‐ray spectrometer of VRA‐30 (Germany, GDR), SPARK‐1‐2М (OAO NPP Burevestnik, S.‐Petersburg, Russia), Rigaku ZSX‐100e and 3270E (Japan), S4 Explorer (Bruker AXS, Germany), Spectro‐X‐LAB2000 (Germany, ED), X‐ray TXRF spectrometers − EXTRA II (Germany) and S2 Picofox (Bruker AXS, Germany), Shimadzu EDX 700 (Japan), Niton XL3t900s portable ED spectrometer, and the Epsilon 5 ED spectrometer with polarizer from PANanalytical, ElvaX Industrial (Elvatech Ltd., Ukraine, ED). In most works, the authors do not discuss the reasons for choosing a specific XRF version. It can be assumed that the main parameters for selecting an X‐ray spectrometer are the cost of equipment and published data on metrological characteristics of commercially available spectrometers.