by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English
X-ray fluorescence from thin foils inserted into the NPS linac have been used to measure the the integrated electron beam current only. The measured x-ray flux and the known inner shell ionization cross sections are used to obtain measurements of dark currents of the order of ten to the minus fourteenth amperes. The same arrangement allows continuous, in-situ energy calibration of our Si(Li) detector in the electromagnetic noise environment of the linac. This technique was originally developed to perform absolute production efficiency measurements of parametric x-ray generation in the 5-60 KeV range.
|Statement||by Thomas J. Fasanello Jr|
|The Physical Object|
|Pagination||52 p. ;|
|Number of Pages||52|
Solid State X-ray Detector Calibration Techniques and LINAC Beam Intensity Measurements by Thomas J. Fasanello Jr. Lieutenant, United States Navy B.S., U.S. Naval Academy, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PHYSICS from the NAVAL POSTGRADUATE SCHOOL December ABSTRACT X-ray. Unclassified SECURITYCLASSIFICATIONOFTHISPAGE REPORTDOCUMENTATIONPAGE SECURITYCLASSIFICATION Unclassified CTIVEMARKINGS 2a. Approved for public release; distribution is unlimitedX-ray fluorescence from thin foils inserted into the NPS linac have been used to measure the the integrated electron beam current only. The measured x-ray flux and the known inner shell ionization cross sections are used to obtain measurements of dark currents of the order of ten to the minus fourteenth : Thomas J. Fasanello. X-ray fluorescence from thin foils inserted into the Naval Postgraduate School linac has been used to measure the integrated electron beam intensity when the accelerator is operating with dark.
Types of X-ray Detectors Gas detectors Ionization chamber Proportional counter Geiger-Muller tube Scintillation counters Solid state detectors Intrinsic semiconductor P-I-N junction Silicon drift Charge coupled device detectors Indirect Direct coupled C. Segre (IIT) PHYS - File Size: KB. IAEA Radiation Oncology Physics: A Handbook for Teachers and Students - Slide 2 INTRODUCTION Accurate dose delivery to the target with external photon or electron beams is governed by a chain consisting of the following main links: • Basic output calibration of the beam • Procedures for measuring the relative dose data. • Equipment commissioning and quality assurance. Solid-state detector, also called Semiconductor Radiation Detector, radiation detector in which a semiconductor material such as a silicon or germanium crystal constitutes the detecting medium. One such device consists of a p-n junction across which a pulse of current develops when a particle of ionizing radiation traverses it. Start studying Radiation measurement and calibration. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Solid state detectors (TLD's, flim, diodes, MOSFETs, polymer gel, scintillation) ~commonly used to calibrate a Linac photon beam ~when measurements are made in air, a build-up cap is used to ensure CPE.
Solid state radiation detectors are often used for dose profiles and percent depth dose measurements. The output factor of a 6 MV Varian EX medical linac beam . In a typical Si detector volume one obtains x free carriers compared to x 10 4 e-h pairs for MIP For a detection of such an event, the number of freeFile Size: KB. Characterization of the mammography X-ray beam is based on measurements of exposure and half value layer (HVL), usually performed with ionization chambers (Wagner et al., ). To ensure the accuracy of these measurements, the calibration and the energy response of these chambers must be determined (see Diagnostic Detectors or Detectors Section).Cited by: Calibration of X-ray detection efficiency would be simple, if X-ray beam with known X-ray energy and intensity is available. We only have to irradiate it to the target detector to get its detection efficiency at that X-ray energy. However, in most cases, it is difficult to prepare such an X-ray beam. We usually have to calibrate the X-ray beam.