The research is mainly focused on studying alpha particle detection with Solid State Nuclear Track Detectors (SSNTDs), including detector response functions, calibration coefficients, energy window and critical detection angles. The research also includes investigation of radon emanation power and radon exhalation rate as well as different methods of measuring radon and radon progeny concentrations in air and water. The research activities are also devoted to measurement of specific activities of natural and artificial radionuclides in the environment, aiming to explore the factors that affect their distribution, bioavailability, and human health risks. The research employs experimental procedures, theoretical models and computer simulation methods.