This work presents a synthesis of results obtained for nuclear dose rates measuredin indoor spaces and outdoor environmentsusing the DIGILERT and INSPECTOR ALERT dosimeters, during trips in various target areas of the project MIS ETC 1676 and BSB27 MONITOX (Romania, Moldova, Greece), in Galati, Tulcea, Constanta (RO), Cahul, Dubasari (MD), Kavala-Thassos (GR) regions involving project members, students and volunteers. The calculated average for each location was compared with limits stipulated by United NationsScientific Committee on the Effects of Atomic Radiation (UNSCEAR) and national legislation. The paper also presents some laboratory applications of gamma-ray spectrometry technique using a NaI(Tl) detectors coupled to NUMECINT and PHYWE spectrometric chains such as identification of radionuclides and determination of the activity of natural radioactive isotopes in environmental samples (soils, rocks, industrial wastes). The measurements were carried out at radioactivity- and environmental-related courses designed for the students at undergraduate and master programs at Dunarea de Jos University of Galati, Romania. The ambient gamma dose rate varied with site, day and hour, due to the temporal fluctuations of natural/cosmogenic radioactivity, meteorological conditions, geological substrate and presence of radiation emitted by building materials. The obtained average value of outdoor gamma radiation dose rate had a minimum of 71 nGy/h at Vama veche beach of Black Sea, Romania, and a maximum of 394 nGy/h in the coastal beach areas of Aegean Sea (Nea Peramos-Amolofi, Greece). The results were compared with the official reports for external gamma dose and with the respective annual average values in Romania and Moldova, our results being lower than the attention limit of 250 nGy/h. Also, it can be noted that the dose rates were in the most cases in the normal range of variation given by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2008 Report from the total outdoor range gamma dose rate, which is 52–163nGy/h. The obtained results are an important statistical element for periodic evaluation of radioactivity in the target regions for national reports and will serve as a base in further investigations and preparation of maps of terrestrial gamma dose rates and calculation of the health risk for population. On-going work is carried out in the frame of Romanian-Moldavian-Greek cross-border cooperation project (code BSB27 MONITOX) for the complex investigation of aquatic ecosystems in the Black Sea basin (Lower Danube, Prut, Dniester and Nestos rivers, Black Sea and Northern Aegean Sea coasts). Acknowledgements: The work was carried out in the frame of the Projects MIS ETC 1676, JOP Romania-Ukraine-Republic of Moldova 2007-2013, and BSB27-MONITOX, JOP Black Sea Basin 2014-2020.