Download or read book Neutron Contamination from Medical Electron Accelerators written by National Council on Radiation Protection and Measurements and published by Ncrp. This book was released on 1984 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Contamination from Medical Electron Accelerators written by National Council on Radiation Protection and Measurements NCRP. and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Contamination From Medical Electron Accelerators written by NCRP. and published by . This book was released on 1983 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of a Conference on Neutrons from Electron Medical Accelerators written by H. T. Heaton II and published by Forgotten Books. This book was released on 2017-10-27 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Proceedings of a Conference on Neutrons From Electron Medical Accelerators: Proceedings of a Conference Held at the National Bureau of Standards, Gaithersburg, Maryland, April 9-10, 1979 I appreciate very much the privilege of speaking at the initiation of this important con ference on neutrons from medical accelerators. This conference has attracted participation by most, if not all, of the experts in this field and it is likely that the work to be reported here will lead to a resolution of this problem. We are all concerned with the problem which con fronts those employing high-energy x-rays and electrons for treatment: that of the proper evaluation of the role of the associated neutron contamination. Before adding my comments on the inherent neutron additive to megavoltage therapy, I should like to review something of the frame of reference of this problem. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Neutron Production and Leakage from Medical Electron Accelerators written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For medical accelerators operating above about 10 MeV, there is an unavoidable production of photoneutrons which add to the head leakage. The yield of photoneutrons produced by electron beams incident on thick targets has been calculated and found to increase rapidly with primary electron energy up to approximately 25 MeV, and more slowly thereafter. Dividing the neutron fluence for W (or Pb) by the photon absorbed dose for the same conditions gives the ratio plotted. This ratio, representing the maximum achievable with practical materials, becomes nearly constant above about 25 MeV incident electron energy where its value is about 2.1 x 105 neutrons cm−2 rad−1. Measurements that fall significantly below the curve are likely due to photon absorption in components that are not high-Z materials, or measurements made with the moveable jaws open. Points that fall significantly above probably mean there is substantial loss of electron beam elsewhere than the intended target.

Download or read book Neutrons from Medical Electron Accelerators written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The significant sources of photoneutrons within a linear-accelerator treatment head are identified and absolute estimates of neutron production per treatment dose are given for typical components. Measured data obtained at a variety of accelerator installations are presented and compared with these calculations. It is found that the high-Z materials within the treatment head do not significantly alter the neutron fluence, but do substantially reduce the average energy of the transmitted spectrum. Reflected neutrons from the concrete treatment room contribute to the neutron fluence, but not substantially to the patient integral dose, because of a further reduction in average energy. Absolute depth-dose distributions for realistic neutron spectra are calculated, and a rapid falloff with depth is found.

Download or read book Exposures from the Uranium Series with Emphasis on Radon and Its Daughters Evaluation of Occupational and Environmental Exposures to Radon and Radon Daughters in the United States Neutron Contamination from Medical Electron Accelerators Induction of Thyroid Cancer by Ionizing Radiation written by National Council on Radiation Protection and Measurements and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of the Neutron Environment Around Varian Medical Electron Accelerators written by Mashal M. Elsalim and published by . This book was released on 1994 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Investigations of the Neutron Contamination in High energy Photon Fields at Medical Linear Accelerators written by Elin Brunckhorst and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Radiation from Medical Electron Accelerators written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is described using simple gold foils and relatively inexpensive moderators to measure neutron fluences, both fast nd thermal, which then can be converted to dose equivalent using a few simple formulas. The method is sensitive, easy to calibrate, and should work at most accelerators regardless of energy or room geometry.

Download or read book Protection Against Neutron Radiation Up to 30 Million Electron Volts written by National Committee on Radiation Protection and Measurements (U.S.) and published by . This book was released on 1957 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of the Neutron Absorbed Dose from Medical Electron Accelerators written by Irena Gudowska and published by . This book was released on 1984 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shielding Techniques for Radiation Oncology Facilities written by Patton H. McGinley and published by Medical Physics Publishing Corporation. This book was released on 2002-01-01 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: A textbook for a senior or graduate course in medical or health physics. Students are assumed to be familiar with the radiation- producing devices used in radiation oncology. The second volume corrects some errors detected in the 1998 first, and adds discussions of intensity modulated radiation therapy, CT room design, the design of direct shielded doors, and other topics. Annotation copyrighted by Book News Inc., Portland, OR.

Download or read book Neutron Fluence and Dose Equivalent Measurements Around Medical Electron Accelerators Using Foil Activation and 235U Fission Chamber written by Irena Gudowska and published by . This book was released on 1985 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoneutron Sources written by B. W. Sargent and published by . This book was released on 1946 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Yield of Medical Electron Accelerators written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shielding calculations for medical electron accelerators above about 10 MeV require some knowledge of the neutron emission from the machine. This knowledge might come from the manufacturer's specifications or from published measurements of the neutron leakage of that particular model and energy of accelerator. In principle, the yield can be calculated if details of the accelerator design are known. These details are often not available because the manufacturer considers them proprietary. A broader knowledge of neutron emission would be useful and it is the purpose of this paper to present such information. 5 refs., 1 tab.

Download or read book Radiological Safety Aspects of the Operation of Electron Linear Accelerators written by William P. Swanson and published by Bernan Press(PA). This book was released on 1979 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron linear accelerators are being used throughout the world in increasing numbers in a variety of important applications. Foremost among these is their role in the treatment of cancer. Commercial uses include non-destructive testing by radiography, food preservation, product sterilization and radiation processing of materials such as plastics and adhesives. Scientific applications include investigations in radiation biology, radiation chemistry, nuclear and elementary particle physics and radiation research. This manual provides authoritative guidance in radiation protection for this important category of radiation sources.