Absorbed dose was estimated after Monte Carlo simulation of proton and ion beam irradiation on metal-oxide and metal-nonmetal memristors. A memristive device comprises two electrodes, each of a nanoscale width, and a double-layer active region disposed between and in electrical contact with electrodes. Following materials were considered for the active region: titanium dioxide, zirconium dioxide, hafnium dioxide, strontium titanium trioxide and galium nitride. Obtained results show that significant amount of oxygen ion - oxygen and nonmetal ion - nonmetal vacancy pairs is to be generated. The loss of such vacancies from the device is believed to deteriorate the device performance over time. Estimated absorbed dose values in the memristor for different constituting materials are of the same order of magnitude because of the close values of treshold displacement energies for the investigated materials

Monte Carlo simulations of proton irradiation on phase change memory cells were conducted and the proton dose, in both the whole memory cell and in its active layer, calculated. The memory cell was modeled by a multi-layer stack consisting of two TiW electrodes and ZnS-SiO2 films as insulators surrounding the active region. Materials considered for the active region were Ge2Sb2Te5, AgSbSe2, and Si2Sb2Te5. The effects of exposing phase change memory cells to proton beams were investigated for various thicknesses of phase change materials and different proton energies. Radiation-induced changes in the investigated memory cells are presented, including the accumulation of atomic displacements and the thermal heating of the active region. Possible effects of these changes on cell operation are discussed. [Projekat Ministarstva nauke Republike Srbije, br. 171007

In the Public Company Nuclear Facilities of Serbia, the measurement of the operational dosimetric quantity, ambient dose equivalent H*(10), is continuously carried out at measurement points in the surrounding of the radioactive waste storage facilities (hangars H1, H2 and H3) and old reactor buildings (RA and RB), located at Vinca site in Belgrade. For that purpose, two different types of passive dosimeters are used: thermoluminescent (TL) high sensitivity dosimeters (LiF:Mg,Cu,P) and optically stimulated luminescence (OSL) dosimeters (Al2O3). The principle of radiation interaction with both types of material is very similar, and the main difference is reflected in the method of detecting the light which is in relation to the dose in the dosimeter. The measurement of the ambient dose equivalent is performed at 34 measuring points in order to monitor the level of radiation exposure in the vicinity of the mentioned facilities. The paper shows the results of the measurements in the period from January to December of 2016. TL and OSL dosimeters were used and read once a month at the same time under the same measurement conditions. The aim of this paper is to present the comparative results of the ambient dose equivalent measurements using TL and OSL dosimeters and compare them with the measurement results of the reference instrument for measuring dose rate (Atomtex AT6101C spectrometer) at the same measuring points. It was found that the differences among the measurement results using different dosimeter types were satisfactory, with a maximum deviation of 35%. The results also show that there is no significant increase in the level of radiation exposure, which is of particular importance to the environment and the population around nuclear facilities in Serbia.

Radiation effects of ion beams in perovskite oxide memristors are analyzedand linked to absorbed dose values, calculated from simulations of ion transport. Several ion species were used in simulations, chosen to represent certain commonly encountered radiation environments. Results indicate that considerable formation of oxygen ion - oxygen vacancy pairs, as well as advent of displaced rare earth and alkaline atoms, is to be expected. Oxygen vacancies can lead to a decrease or increase of active layer resistance, depending on applied voltage polarity. The loss of vacancies from the device is bound to impair the performance of the memristor. Calculated absorbed dose values in the memristor for various incident ion beams are typically on the order of several kGy.

Public Company "Nuclear Facilities of Serbia" is the only nuclear operator in Serbia. Under the radiation safety and radiation protection measures of people and environment, Public Company conducts the environmental radiation monitoring around nuclear facilities. Monitoring also includes relevant meteorological measurements at the micro-location. This paper shows the correlation between the change of ambient gamma dose rate equivalent in the air and meteorological parameters: precipitation and the relative humidity in air. All the measurements were taken at the site of a meteorological tower on 114 meters above sea level, in the vicinity of nuclear facilities. Monthly values of relative humidity of the air and intense rainfall were obtained during 2017. The analysis of this relation clearly shows the impact of the intense rain and the relative humidity of the air on the ambient gamma dose rate equivalent. Calculated Pearson's correlation coefficient shows the degree of the above-mentioned dependence.