It is a frequent clinical, and less frequent labora tory, observation that a tumor subjected to a number of sublethal irradiations will gradually acquire radioresistance (5, 11). The usual manifes tation of acquired radioresistance by a tumor is the diminished amount of regression for the same dose, or the increased dose required for an equal amount of regression or for sterilization, as the ra...

Polymer used in satellite manufacturing are exposed to surface charging phenomenon due electronic irradiations. This can induce electrostatic discharges (ESD) which lead failures. In order limit this phenomenon, we propose develop PEEK composite reinforced with Short Carbon Fibres (SCF). We studied the behaviour of these composites pristine state and after irradiations compared PEEK. state, fib...

We determined the kinetic polarities of chromosomal spindle fibre microtubules in vivo: either the kinetochore or pole ends of chromosomal spindle fibres were irradiated with near-ultraviolet light to prevent depolymerization by colcemid. Irradiations began either just before or just after colcemid addition; cells were continually irradiated and continuously immersed in colcemid. Irradiations o...

The radiation hardness of diamonds makes them a strong candidate to replace the inner most part of the CMS tracking detector. Polycrystalline diamond has been shown to regain some its CCD under sub-bandgap irradiations due to the depolarization of the diamond sensor. Monocrystalline diamonds that have suffered proton radiation damage exhibit a similar CCD reduction due to polarization. This stu...

Biopolymers, including extracellular matrix proteins and polysaccharides, are used as substrates for cell culture scaffolds in tissue engineering. Ionizing radiation, example with gamma rays or electron beams, is to sterilize materials modify the physical chemical properties of materials. The principles effect ionizing radiation on biopolymers discussed this review article. Among types beams wi...

Abstract The tribological performances of perfluoroalkylpolyethers (PFPE) with graphene (Gr), WS 2 , and the mixture Gr (Gr + ) before after ultraviolet (UV), atomic oxygen (AO), proton (Pr) irradiations were investigated. composition structure PFPE, Gr, also analyzed to understand effects irradiation on behaviors PFPE additives. results indicated that serious deterioration degradation took pla...

The aim of this work was to track and verify the delivery of respiratorygated irradiations, performed with three versions of TrueBeam linac, using a novel phantom arrangement that combined the OCTAVIUS® SRS 1000 array with a moving platform. The platform was programmed to generate sinusoidal motion of the array. This motion was tracked using the real-time position management (RPM) system and fo...