Maisto radiologinio monitoringo, nustatant 90Sr ir 137Cs savituosius ir tūrinius aktyvumus, optimizavimo būdai nėra nagrinėti. Nenustatyta kaip maisto mėginių radiologinių tyrimų rezultatai atspindi radionuklidų kiekį visame suvartotame maiste. Šiuo metu negalima atsakyti į klausimą, ar šalies gyventojų apšvita dėl 90Sr ir 137Cs maiste jonizuojančiosios spinduliuotės, įvertinta pagal atliktų maisto radiologinių tyrimų rezultatus, buvo ir yra tikrai tokia, kokia buvo nustatyta ar nustatoma, t. y. trūksta duomenų apie tyrimų rezultatų reprezentatyvumą. Aplinkosauginiu ir ekonominiu požiūriu įvertinti maisto radiologinio monitoringo optimalumą bei parengti jo keitimui rekomendacijas dėl taršos aplinkoje lygių ir maisto produktų importo kaitos tendencijų yra aktualu, vengiant nepagrįstai didelių radiologinių tyrimų apimčių. Optimalus mėginių kiekis ir tinkamos mėginių rūšys įgalintų išvengti nepagrįstai didelės apšvitos gyventojams, tinkamai įvertinus vidutines dozes dėl maiste esančių 90Sr ir 137Cs jonizuojančiosios spinduliuotės. Maisto radiologinio monitoringo optimizavimas svarbus ir dėl pastarųjų metų tendencijų atskirose valstybėse, taip pat ir Lietuvoje, planuojant plėtoti branduolinę energetiką. Įvertinus naujų technologijų su jonizuojančiosios spinduliuotės šaltiniais plėtrą atskirose socialinėse ekonominėse srityse yra būtina optimali radiologinio monitoringo programa, garantuojanti gyventojų apsaugą nuo jonizuojančiosios spinduliuotės. / Optimization methods of radiological monitoring of food for the measurements of 90Sr and 137Cs activity concentrations are not estimated. No determination is made in which extent the results of measurements of activity concentration in the samples reflect the amount of radionuclides in all food consumed. The estimation of the ways for the optimization of radiological monitoring of food and preparation of recommendations for the changes in the monitoring program according the levels of radioactivity in the environment and amount of food imported is relevant for the optimization of measurement program not to extend the program and to save allocations. Optimization of food radiological monitoring program should help for the protection of the public to avoid exposure due to 90Sr and 137Cs in food when the average annual dose estimation is made correctly. Optimization of food radiological monitoring is important in nowadays when the planning of development of nuclear energy is going on in different countries including Lithuania. To take into account the development of new technologies using sources of ionizing radiation the optimization of food radiological monitoring program should assure the radiation protection of public.

It was being exploratored radiation pollution of fish living in water-cooling basin of Ignalina Nuclear Power Plant (NPP) in master's work. The objectives of work. NPP water-cooling basin's fish. The purpose of work was to estimate fish (Rutilus rutilus ( L.), Abramis brama ( L.), Esox lucius ( L.) and Perca fluviatilis ( L.)) contamination degree with macrobiotic radioisotopes cesium ( 137Cs) and strontium ( 90Sr) of Ignalina Nuclear Power Plant ( NPP) water cooling basin, to point up estimated radio-pollution concentrations dependence from fish capturing period of year, their (fish) varietal particularity, nutritional mode of fish life and compare with fish contamination by macrobiotic radioisotopes in other Lithuanian waters. Methods of work. Gama spectral analysis to estimate 137Cs levels in foodstaffs; 90Sr method estimation in foodstaffs and environmental samples by method of Tcherenkov radiation. The experiment was accomplished in the Laboratory of Environmental Protection – the subdivision of Ignalina NPP in 2004-2005. Samples of fish were delivered for the investigations by three times a year ( by 20 kg for every time (month); by 5 kg of different kind; totally 60 kg). It was being applied that method for statistical evaluation of secured data - calculable marks evaluation of secured results. All findings are on 95 % reliability level. The results of investigations showed, that larger specific activity of ( 137Cs) has been found in Esox lucius ( L.) and Perca... [to full text]

This research deals with equivalent dose rate (EDR) in the ground level air caused by gamma radiation. Weighting factor for gamma radiation is equal one, so EDR in the ground air is identical absorbed ionic radiation dose. Highways A6 Kaunas-Zarasai and A11 Panevėžys-Šiauliai-Palanga were investigated. In this research the main parameters determining the level of equivalent dose rate in the ground air by the Lithuanian highways have been defined and analyzed. The objective of this research is to measure EDR in the ground air by the Lithuanian highways and compare to adequate average regional and with reference to modulation values evaluate variation reasons. In the expeditions EDR in the ground air was measured in winter and in summer. Samples of soil and asphalt were examined with gamma spectrometer and analyze presented. There was determined the dependence of EDR in the ground air from soil composition, floral or snow cover and distance to the asphalt cover. Cosmic radiation impact on EDR formation is equal to all locations. Natural origin radionuclides in soil gamma radiation have the main influence to EDR formation in the ground air. Modeling program VISIPLAN was used to define impact of radionuclides radiation in asphalt cover to EDR formation in the roadside zone. Modeling program InterRAS was used to define EDR in the ground air formation from gamma radiation of radionuclide in soil.