منابع مشابه
Absolute Current Calibration of 1μa Cw Electron Beam
The future experimental program at Jefferson Lab requires an absolute current calibration of a 1 μA CW electron beam to better than 1% accuracy. This paper presents the mechanical and electrical design of a Tungsten calorimeter that is being constructed to provide an accurate measurement of the deposited energy. The energy is determined by measuring the change in temperature after beam exposure...
متن کاملMeasurements of Photon Beam Flattening Filter Using an Anisotropic Analytical Algorithm and Electron Beam Employing Electron Monte Carlo
Introduction: This study aimed to report the measurement of photon and electron beams to configure the Analytical Anisotropic Algorithm and Electron Monte Carlo used in clinical treatment. Material and Methods: All measurements were performed in a large water phantom using a 3-dimensional scanning system (PTW, Germany). ...
متن کاملAn investigation into factors affecting electron density calibration for a megavoltage cone‐beam CT system
There is a growing interest in the use of megavoltage cone-beam computed tomography (MV CBCT) data for radiotherapy treatment planning. To calculate accurate dose distributions, knowledge of the electron density (ED) of the tissues being irradiated is required. In the case of MV CBCT, it is necessary to determine a calibration-relating CT number to ED, utilizing the photon beam produced for MV ...
متن کاملHigh Voltage Discharges as Electron Beam Source for Calibration Measurements Udc: 533.5
We have characterized two high voltage glow discharge configurations, with planar cathode and hollow cathode respectively, as electron beam sources. Electron beams having currents between several mA and tens of mA, energy values close to the applied voltage and variable pulse duration between hundreds ns and a few ms were obtained. The simplicity, compactness and unpretentious vacuum operation ...
متن کاملDetermination of absorbed dose calibration factors for therapy level electron beam ionization chambers.
Over several years the National Physical Laboratory (NPL) has been developing an absorbed dose calibration service for electron beam radiotherapy. To test this service, a number of trial calibrations of therapy level electron beam ionization chambers have been carried out during the last 3 years. These trials involved 17 UK radiotherapy centres supplying a total of 46 chambers of the NACP, Mark...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1978
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001364841