Mitigating Thermal Beam Damage with Metallic Coats in Low Voltage FEG-EPMA of Geological Materials
نویسندگان
چکیده
Field emission gun electronprobe microanalysis (FEG-EPMA) provides the analyst with the opportunity to characterize very small volumes of material. Using a low voltage source the irradiated volume is submicron. It is well known that some geological phases e.g. volcanic glass, carbonates, phosphates, hydrous silicates suffer beam damage under high beam current condition [e.g.1,2] and several authors suggest mechanisms either to mitigate beam damage (e.g. cryostage cooling, reduced beam currents, metallic coats etc. [2,3,4.5]) or to use the time dependent intensity to interpolate the count rate back to the original composition at zero time [5].
منابع مشابه
Pushing the XEDS Boundaries in Materials Research: Low Voltage XED Spectrum Imaging in the FEG-SEM
Low-voltage high resolution imaging in advanced field emission gun scanning electron microscopes (FEG-SEMs) is an essential technique in the characterisation of a broad range of materials – particularly for polymers and complex multiphase/multicomponent materials, that can experience significant charging effects during conventional 10 to 20 kV imaging. In particular, the analysis of corrosion s...
متن کاملNumerical study of thermal dynamics of gold nanoparticles in laser-induced hyperthermia therapy
Damage of the normal tissue is a serious concenrn in cancer treatment. Hyperthermia by laserhas been considered as a safe cancer treatments methods with lower harmful effects on normaltissues. Using nanoparticles in cancer treatment has improved laser therapy, which is based ona selective cell targeting method to localize cell damages. Metallic nanoparticles such as gold,silver, and copper have...
متن کاملAnalysis of the theory of thermal damage in biological tissues caused by Laser beam
Introduction: In laser surgery, the laser beam can evaporate and cut the tissue like a small surgical knife when the tissue temperature is heated to 100 degrees Celsius. a complete understanding of the distribution of damage in both pathologic tissue and surrounding tissue is necessary. Although the test is the most realistic solution for treating medical problems, for this rea...
متن کاملMoving Solid Metallic Targets for Pion Production in the Muon Collider / Neutrino Factory Project
The production of large fluxes of pions and muons using high-energy, high-intensity proton pulses impinging on solid or liquid targets presents unique problems which have not yet been entirely solved. We investigate the possibilities of using solid targets by choosing a metal of either extremely low thermal expansion coefficient or exceptionally high mechanical strength. Candidates are respecti...
متن کاملMoving Solid Metallic Targets for Pion Production in the Muon Collider I Neutrino Factory Project
The production of large fluxes of pions and muons using high-energy, high-intensity proton pulses impinging on solid or liquid targets presents unique problems which have not yet been entirely solved. We investigate the possibilities of using solid targets by choosing a meral of either extremely low thermal expansion coefficient or exceptionally high mechanical strength. Candidates are respecti...
متن کامل