Noncoplanar radiation fields from a linear accelerator can be used to deliver radiation dose distributions that are superior to those delivered using coplanar radiation fields. Noncoplanar radiation field arrangements are especially valuable when delivering stereotactic body radiation therapy (SBRT). Noncoplanar radiation fields, however, are geometrically more challenging to deliver than copla...

We extend the classic results of paper [P. C. W. Davies, S. A. Fulling, and G. Unruh, Phys. Rev. D 13, 2720 (1976).] ``Energy-momentum tensor near an evaporating black hole'' by considering a massive scalar field in two dimensions presence thin shell collapse. show that outside WKB approximation is valid for any value $r$ if $m{r}_{g}\ensuremath{\gg}1$, where $m$ mass field, ${r}_{g}$ Schwarzsc...

conclusions the state of observed radiation protection principles was relatively in the weak level in the studied radiology departments especially in facilities such as ventilation system, radiography entrance, and darkroom situation. more important reason was usage changing of sections as radiology billet from related organizations. results the mean of radiation protection in the studied radio...