Proton beams are promising means for treating tumors. Such charged particles stop at a defined depth, where the ionization density is maximum. As the dose deposit beyond this distal edge is very low, proton therapy minimizes the damage to normal tissue compared to photon therapy. Nevertheless, inherent range uncertainties cast doubts on the irradiation of tumors close to organs at risk and lead...

For the first time, proton complexes of photoinduced colored form chromene have been obtained in polymer binders. It is shown that UV irradiation photochromic leads to spectral changes due structure compounds and nature binder. Keywords: photochromism, chromene, naphthopyran, matrix, spectroscopy.

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...

High-performance production targets and other critical accelerator components intercepting intense, energetic proton beams are essential as the accelerator community envisions the next generation, multi-MW accelerators. Materials that have served the nuclear sector well may not be suitable to play such a role which demands that the material comprising the beam-intercepting element must, in addi...

Aims—To assess the cellular proliferation using the monoclonal antibody Ki-67, in paraYn embedded uveal melanomas irradiated by proton beam, as well as in non-irradiated uveal melanomas. Methods—30 enucleated eyes were included for histopathological study and Ki-67 immunostaining. Patients were enucleated between 1991 and 1996 for uveal melanoma, 14 after proton beam irradiation and 16 without ...

Near-infrared color centers in silicon are emerging candidates for on-chip integrated quantum emitters, optical-access memories, and sensing. We access ensemble G-color-center formation dynamics radiation-induced atomic disorder a series of megaelectronvolt proton-flux conditions. The photoluminescence results reveal that the G formed more efficiently by pulsed-proton irradiation than continuou...