There has been need to develop alpha and beta particle detectors capable of detecting alpha and beta radiations beyond their short range in air over 1km-square area of land. This research has suggested and explored two new and indirect principles towards achieving this.The first method discussed the possibility of tracking the ultraviolet and visible fluorescence light yield from their ionization and excitation effects as alpha and beta contamination signatures. The second method through theoretical calculations explored the possibility of alphas going into nuclear reaction with oxygen and nitrogen isotopes of the air and yielding neutrons which are easily tractable from a far. This work is a suggestive ideology open to further research and contributions which is geared towards providing a solution to short range nature of alpha and beta contamination detectors.5433 Руб.
The present work focuses on a study of different mechanisms to engineer homogeneously distributed fine sized alpha precipitates in the beta matrix of beta titanium alloys. The precipitation of metastable phases (such as omega phase) upon low temperature aging and their influence on alpha precipitation is studied in detail. The precipitation sequence on direct aging above the omega solvus temperature is also assessed. The structural and compositional evolution of precipitate phase is determined using multiple characterization tools (3DAP, TEM, SEM, Synchrotron XRD). The possibility of occurrence of other non-classical precipitation mechanisms that do not require heterogeneous nucleation sites are also analyzed. Lastly, the influence of interstitial element, oxygen on alpha precipitation during the oxidation of Beta 21S has been determined. The ingress of oxygen and its influence on microstructure have also been correlated to measured mechanical properties.4850 Руб.