Download or read book A Method for Determining Neutron Flux Spectra from Activation Measurements written by Sven R. Hartmann (1/Lt. USAF.) and published by . This book was released on 1957 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Flux Spectra Determination by Foil Activation Volume I n Advanced Foil Activation Method of Determining Neutron Flux Spectra Or Radiation Effects Studies written by W. N. McElroy and published by . This book was released on 1965 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The qualitative aspects of the activation technique of neutron flux spectral determination are well known. The quantitative aspects are not so well known. In part, the failure of correlation and subsequent understanding of neutron radiation effect studies is attributed to a lack of adequate knowledge about the form of neutron environments. An Advanced Activation Method of Neutron Flux Spectral Determination based on the use of updated and more accurate cross section data and activation measurements is presented. This method will permit the definition of neutron flux spectral forms with increased accuracy for radiation effect studies. The results of error analysis studies on methods of foil activity data reduction and requirements on the accuracy of activation detector cross section data and activity measurements are presented and discussed. The appendixes of this volume contain tabulated data that are necessary for the performance of Step I of the advanced method of foil activation data reduction. Volume II of this report presents and discusses the updated evaluated cross section data. Volume III discusses the computer code required for the performance of Step II of the advanced method. Volume IV presents the results of Tory II-C flux spectral measurements using the advanced method of data reduction. (Author).
Download or read book Measurement of Neutron Flux and Spectra for Physical and Biological Applications written by National Committee on Radiation Protection and Measurements (U.S.) and published by . This book was released on 1960 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Neutron Flux and Spectra for Physical and Biological Applications written by National Committee on Radiation Protection and Measurements (U.S.) and published by . This book was released on 1960 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Neutron Flux Spectra in a Tungsten Benchmark by Neutron Foil Activation Method written by Cezar Ciprian Negoita and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Fluence Measurements written by International Atomic Energy Agency and published by . This book was released on 1970 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Computer automated Iterative Method for Neutron Flux Spectra Determination by Foil Activation Volume 1 a Study of the Iterative Method written by W. N. McElroy and published by . This book was released on 1967 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multiple foil activation iterative method has been developed to determine neutron flux spectra. A computer code (SAND II) has been written which provides a 'best fit' neutron differential flux spectrum for a given input set of infinitely dilute foil activities. The results of experimental and analytical studies for a wide variety of neutron environments strongly suggest that, in addition to determining neutron flux spectra, the multiple foil activation iterative method can be helpful in (1) the validation and improvement of calculational techniques used to predict flux spectra; (2) upgrading of confidence in neutron spectrometer measurements; (3) determining the reliability of foil activity measurements methods; (4) assessing material scattering/ absorption effects; and (5) examining current foil detector cross section evaluations to provide guidance for re-evaluation for these data, and eventual 'unfolding' of the absolute differential form of cross sections for any foil reactions producing a detectable product.
Download or read book Status of the Dosimetry for the Radiation Effects Research Foundation DS86 written by National Research Council and published by National Academies Press. This book was released on 2001-10-04 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Committee on Dosimetry for the Radiation Effects Research Foundation (RERF) was set up more than a decade ago at the request of the U.S. Department of Energy. It was charged with monitoring work and experimental results related to the Dosimetry System 1986 (DS86) used by RERF to reconstruct the radiation doses to the survivors in Hiroshima and Nagasaki. At the time it was established, DS86 was believed to be the best available dosimetric system for RERF, but questions have persisted about some features, especially the estimates of neutrons resulting from the Hiroshima bomb. This book describes the current situation, the gamma-ray dosimetry, and such dosimetry issues as thermal-neutron discrepancies between measurement and calculation at various distances in Hiroshima and Nagasaki. It recommends approaches to bring those issues to closure and sets the stage for the recently convened U.S. and Japan Working Groups that will develop a new dosimetry for RERF. The book outlines the changes relating to DS86 in the past 15 years, such as improved numbers that go into, and are part of, more sophisticated calculations for determining the radiations from bombs that reach certain distances in air, and encourages incorporation of the changes into a revised dosimetry system.
Download or read book The Two plate Method of Measuring Fast Neutron Energy Spectra when the Direction of the Incident Neutrons Cannot be Determined written by John E. Evans and published by . This book was released on 1952 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Physics written by Karl-Heinrich Beckurts and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based upon a series of lectures I have occasionally given at the University of Gottingen since 1951. They were meant to introduce the students of experimental physics to the work in a neutron physics laboratory dealing with the problem of measuring neutron flux, diffusion length, Fermi age, effective neutron temperature, absorption cross sections and similar problems. Moreover, these lectures were intended to prepare the students for a subsequent lecture covering the physics of nuclear reactors. The original character of this series of lectures has been retained in the book. It is intended for use by students as well as anyone desiring to work on neutron physics measurements. The first half mainly covers the theory of neutron fields, i. e. essentially diffusion and slowing down theory. The second half is largely concerned with measurements in neutron fields. The appendix contains information and data which, in our experience, are frequently required in a neutron laboratory. The field of nuclear physics proper is briefly touched upon in the first two chapters, but only to the extent necessary for the understanding of the following chapters. The multitude of applications of neutron radiation has not been covered. The conclusion of this manuscript coincided with the end of my long period of activity with the Max-Planck-Institut fur Physik at Gottingen. To Professor HEISENBERG lowe thanks for his advice and suggestions for many of the subjects treated here.
Download or read book Modern Trends in Activation Analysis written by James R. DeVoe and published by . This book was released on 1969 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A High energy Neutron Flux Spectra Measurement Method for the Spallation Neutron Source written by Nicholas Patrick Luciano and published by . This book was released on 2012 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work was to develop a foil activation method to measure high-energy (1--120 MeV) neutron flux spectra at the Spallation Neutron Source by researching the scientific literature, assembling an experimental apparatus, performing experiments, analyzing the results, and refining the technique based on experience. The primary motivation for this work is to provide a benchmark for the neutron source term used in target station and shielding simulations Two sets of foil irradiations were performed, one at the ARCS beamline and one at the POWGEN beamline. The gamma radiation of the foil activation products was measured with a high purity germanium gamma-ray spectrometer, and the product reaction rates during irradiation were quantified. Corrections, such as self-shielding factors, were applied to the measurements to account for particular effects. The corrected measurement data, along with calculated response functions and an initial guess spectrum, were input to the MAXED neutron spectrum unfolding computer code. MAXED uses the maximum entropy method to unfold an output spectrum that is the minimally modied guess spectrum consistent with the measurement data. The foil irradiation and subsequent analysis from the ARCS spectrum produced a reasonable neutron spectrum, which noticeably differed from the initial guess spectrum. This measurement is regarded as consistent, but yet unverified. The gamma-ray spectrum of the foil irradiation at the POWGEN beamline showed no high-energy activation. This is regarded as an experimental error, and no conclusions can be drawn about the high-energy neutron spectrum. Future foil irradiations are planned to verify and expand the neutron spectrum measurements.
Download or read book Measurement of Neutron Flux and Spectra for Physical and Biological Applications written by National Committee on Radiation Protection and Measurements (U.S.) and published by . This book was released on 1960 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal and Fission Neutron Flux Measurements in Process Tubing and in Neutron Activation Test Locations written by and published by . This book was released on 1961 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron activation analysis provides the extremely high sensitivity necessary for the measurement of many trace elements. Activation techniques are presently being used to measure the concentrations of various undesirable parent isotopes in reactor process tubing, slug jackets and their corrosion film, and in process vater and vater treatment chemicals. The interpretation of results from activation analysis are sometimes complicated by the fact that a given radioisotope may be produced by fission neutrons (threshold reactions) from other elements as well as by the more common thermal neutron (n, [gamma]) reactions. Shielding the sample with cadmium prior to irradiation or irradiating in the graphite reflector will minimize the contributions from thermal or fission neutrons, respectively. The purpose of this study has been to measure the ratios and magnitudes of the thermal and fission fluxes in process tubing and to compare these with values at locations where neutron activations can be performed. Also, it was of interest to measure the ratios and magnitudes of the thermal and fission fluxes from a point in the lattice to a point well into the graphite reflector, and to determine if the fission neutron spectrum as measured by two threshold reactions, changes appreciably over this region. These data will aid in selecting the most favorable available positions for activations with thermal neutron reactions or with threshold reactions.
Download or read book Neutron Flux Spectra Determination by Foil Activation Volume Ii Experiental and Evaluated Cross Section Library of Selected Reactions written by R. C. Barrall and published by . This book was released on 1965 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey was made of nuclear reactions which may be used in measuring neutron flux spectra and fluence. An important application of these data is the determination of neutron flux spectra and fluence for application to radiation effects studies (including dose to tissue). Published microscopic cross section data for 28 reactions have been compiled and are shown graphically. The evaluation of the microscopic data is shown by a line through the data. A tabulation of the evaluated cross section library is provided. Measured values of the resonance integral for selected reactions are reviewed and compared with resonance integrals calculated using the evaluated cross section library. The effects of 0.508, 1.016, and 2.032 mm thick cadmium are discussed. Average cross sections for boron-10 covered foils are calculated. The average cross sections of the 28 reactions in a fission spectrum is calculated. (Author).
Download or read book DETERMINATION OF THE ABSOLUTE NEUTRON FLUX SPECTRUM IN THE PCTR FAST NEUTRON CAVITY FROM MULTIPLE FOIL ACTIVATION MEASUREMENTS written by and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Fluence Neutron Spectra and Kerma written by International Commission on Radiation Units and Measurements and published by . This book was released on 1969 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
