Prior to every ion implantation experiment a simulation of the ion range and other relevant parameters is performed using Monte-Carlo based codes. Although increasing computing power has improved the speed of these calculations, the demands on Monte-Carlo codes are also increasing, requiring evaluation of the optimal number of simulations while ensuring accuracy within threshold bounds. We evaluate the “Stopping and Range of Ions in Matter” (SRIM) code due to its widespread usage. We show how dividing simulations into multiple parallel simulations with different random seeds can lead to calculation speedup and find lower bounds for the required number of ion traces simulated based on an exemplar system of a Ga focused ion beam and a high energy C beam as used in high linear energy transfer testing. Our results indicate simulations can yield results within the underlying data accuracy of SRIM at 10X and 100X shorter simulation time than the SRIM default values.

This study proposes a method for modifying the wettability of Au thin films of thicknesses 5 nm and 10 nm on Si substrates using 8 keV Ne ion beam irradiation at different fluences, thereby enabling surface wettability adjustment at the nano-scale and its thickness dependence. This advancement would be highly beneficial for applications such as high-resolution printing and nano-biotechnology. The contact angle of the irradiated region for the 5 nm thin film changed from hydrophobic to hydrophilic with increasing ion dosage, whereas for the 10 nm thin film, it changed from hydrophilic to hydrophobic under the same conditions. Fractal analysis was performed on pristine and ion beam modified surfaces to investigate the underlying nano-structuring process, with reported values for average roughness (Ra), Hurst exponent (H), fractal dimension (Df), contact angle (CA), and wettability at different ion dosages. Atomic Force Microscopy and Rutherford Backscattering Spectroscopy were used to examine surface roughness and depth profile. The process of sputtering becomes crucial when the ion range approaches the thickness of thin films, with the sputter yield showing dependence on the thickness of thin films at different ion fluence levels. Monte Carlo simulations SRIM/TRIM and TRIDYN were used for comparison with the experimental results, with TRIDYN taking into account dynamic changes in the target's morphology and composition.

Nanostructured composite films with 0.8ZnO – 0.2BaTiO3/Al2O3 (ZB2) composition were irradiated using 200 MeV Ag+15 ions with 5 × 1010 ions/cm2 to 5 × 1012 ions/cm2 fluences to understand the variation in anti-ferroelectric (AFE) property and hysteric I-V behavior. XRD data of all the pristine and irradiated films show the presence of compressive strain and dominance of ZnO phase. AFM reveals the evolution of unevenly spaced pattern separated by brink like structure and the space between brinks increase with ion fluence. RBS measurement confirms film thickness and elemental composition of pristine and irradiated ZB2 films. Irradiation induced modifications in unconventional double hysteresis loop in ferroelectric (P-E) measurements is discussed in the light of formation of structural defect and oxygen vacancies and its role in domain wall motion. Variations in the resistive switching in I-V hysteresis behavior was understood in the context of oxygen vacancies and defect formation by ion irradiation.

The effect of Li doping on the structural and luminescence properties of MgO were investigated in the present work. Decrease in Lattice parameter and generation of vacancies, and interstitial defects were analysed by XRD and rietveld refinement. Shift in edge energy of Mg K-edge indicates unsaturated cations which affects the PL spectra on excitation wavelength of 275 nm and 405 nm. Thermoluminescence were carried out on gamma-irradiated samples to study the defects present in the host. Li+ ions creates stable radiative favourable traps at 437 K with dose increment. The constant TL peaks with dose demonstrates the stability of the glow curves, indicates performance for dosimetry applications.

We review the electronic stopping power data within the IAEA database, assessing the abundance and scarcity of available data as a function of energy and collisional systems. Our analysis includes an examination of the experimental values, their evolution in time, the dispersion among data, and trends of the more recent measurements. Additionally, we provide comparisons with SRIM-2013 calculations for select cases of interest. Notably, we identify sparsely measured systems and energy regions, emphasizing the pressing need for new, reliable data and independent theoretical predictions.

The irradiation response of yttria-stabilized zirconia, having different grain sizes, subjected to 900 keV iodine ions at room temperature and 1000 K is reported. GIXRD and Raman spectroscopy indicate superior radiation tolerance of the fine-grained samples when compared to their coarse-grained counterparts which is attributed to the abundance of grain boundaries at relatively shorter distances. A reduction in the residual strain is observed in the samples irradiated at 1000 K. This is attributed to the clustering of the irradiation induced point defects thereby resulting in a decrease in their density, but with a corresponding increase in the extended defects density.

Polymer gel dosimeters are being developed and improved to perform measurements of radiation dose distributions in 3-dimensions (3-D) for the purpose of patient specific quality assurance for cancer patients and the configuration of treatment planning systems. The effect of organic glucose sensitizer (GL) material on N-(3-methoxypropyl) acrylamide polymer gel dosimeter (NMPAGAT) was presented in this study and evaluated after irradiation using nuclear magnetic resonance (NMR) read-out technique in terms of spin–spin relaxation rate (R2) of hydrogen protons within the water molecule. The improved tissue equivalent polymers of GL-NMPAGAT were irradiated using a medical linear accelerator with photon beams with doses up to 20 Gy, energies range 6–15 MV, dose rates range 50–500 cGy/min, and irradiation temperatures range 15–25 °C. The R2 dose sensitivity of GL-NMPAGT polymer with a concentration of 25 % wt GL was improved significantly and found to be two times higher than the same gel without GL in the linear dose response of 0.07–8 Gy. The 0.07 Gy represents the minimum detectable dose in the improved dosimeters. The dosimeter was found stable within a period of up to two weeks after irradiation, which is significant. No significant dose rate, energy dependence, and irradiation temperature for the dosimeter was observed over the range studied. There is decrease in R2 values with increasing scanning temperature. The gel is water equivalent and has theoretical energy-independent response from 0.1 to 20 MeV with density of 1.023 ± 0.003 g/cm3 and Zeff of 7.53. The results of the improved dosimeter in this study (i.e., 100 %, 0.32 s−1 Gy−1, and 8 Gy linearity) are toward the upper limit compared to other polymer gel dosimeters even with sensitizer additives.

Polyimide foils were irradiated with MeV ions below charge state equilibrium and etched in sodium hypochlorite solution to measure the material depth below which ion tracks occurred. It was observed that no etchable ion tracks were formed in the first few nanometres of the foil as the electronic stopping power was below the damage threshold. The damage threshold was crossed at a certain depth in the foil and intermittent tracks began to form. The measurement of depth for crossing the damage threshold in polyimide enabled verification of the previously theoretical models for the evolution of nonequilibrium charge variation of electronic stopping power during charge state equilibration of energetic ions and explicitly demonstrated that the equilibration process plays a role in ion-induced nanostructureformation.