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CONTENTS Introduction 1. Dose rate of gamma and neutron radiation in the cyclotron facility 2. Ionizing radiation in radiochemical laboratory and personnel doses 3. Radiation sources in PET department and their contribution in personnel radiation exposure 4. Doses of patients under performance of PET/CT study Summary

Introduction 1. General requirements to PET-radionuclides 2. Parameters of radionuclide ranging for application in PET 3. Positron emitters for different applications. Selection criteria - PET-studies - Joint PET- and SPECT-studies - Theranostics - Special applications 4. Availability of positron emitters - Cyclotron production of PET-radionuclides - Conventional radionuclides - Radionuclides under development - Production of PET-radionuclides on radionuclide generators 5. Future development of PET providing with radionuclides Conclusion

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Sentiment analysis is a modern task in natural language processing and linguistics. Also referred to as opinion mining, it deals with different kinds of affective states: opinion, emotions, stance and evaluations. Sentiment itself is the polarity of these affective states. Taking analytical articles as source material for the study, several problems should be considered. Firstly, these texts broaden the understanding of the subject of opinion, because it does not coincide with the author of the text in the majority of cases. Secondly, subjects and objects of opinion are entities – words or word combinations with strictly denoted referent. In the paper only Named Entities, that are normally expressed by proper nouns, are considered. This kind of sentiment analysis requires deeper research of possible sentiment relations between entities and of lexical and grammatical influence on these relations. The paper is devoted to the study of the influence of the group of lexemes on opinion structure. The research shows that mutual sentiment can be presented as stable patterns.