نتایج جستجو برای: rk ionization chamber
تعداد نتایج: 81022 فیلتر نتایج به سال:
Acquisition of quasi-monoenergetic ("pristine") depth-dose curves is an essential task in the frame of commissioning and quality assurance of a proton therapy treatment head. For pencil beam scanning delivery modes this is often accomplished by measuring the integral ionization in a plane perpendicular to the axis of an unscanned beam. We focus on the evaluation of three integral detectors: two...
Recently, Quick-Scanning Extended X-ray Absorption Fine Structure Spectroscopy (QEXAFS) has become an important tool for in-situ characterization of materials and measurement of associated electronic structure for where samples have a short life due to X-ray damage. In this case, the time response of the ionization chamber affects the measurement resolution and therefore overall performance of ...
A pixel-segmented ionization chamber has been designed and built by Torino University and INFN. The detector features a 24 x 24 cm2 active area divided in 1024 independent cylindrical ionization chambers and can be read out in 500 micros without introducing dead time; the digital charge quantum can be adjusted between 100 fC and 800 fC. The sensitive volume of each single ionization chamber is ...
PURPOSE Assessment of the fundamental dosimetric characteristics of a novel gated fiber-optic-coupled dosimetry system for clinical electron beam irradiation. METHODS The response of fiber-optic-coupled dosimetry system to clinical electron beam, with nominal energy range of 6-20 MeV, was evaluated for reproducibility, linearity, and output dependence on dose rate, dose per pulse, energy, and...
NIMROD is a nearly 4pi detector system that consists of a 4pi neutron ball, 96 Ionization Chamber-Si-CsI modules in the forward 8 rings from 3.6 degree to 47 four rings with 46 CsI, Ionization Chamber and several Si detectors covering backward angles theta from 47 degrees to 170 degrees, four rings with 46 CsI, Ionization Chamber and several Si detectors covering backward angles theta from 47 d...
The double 1s ionization of Si induced in collisions with protons and heavier ions (C, Ne) was studied by measuring the K X-ray emission of a solid Si target. In order to resolve the hypersatellite contributions in the spectra, high-resolution crystal diffractometry was employed yielding subelectronvolt energy resolution. Experimentally obtained hypersatellite yields were used to determine the ...
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