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Measurement Of Neutron Fluence Spectra Using A Passive Nested Neutron Spectrometer With Gold Foils
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Book Synopsis Measurement of Neutron Fluence Spectra Using a Passive Nested Neutron Spectrometer with Gold Foils by : Felix Mathew
Download or read book Measurement of Neutron Fluence Spectra Using a Passive Nested Neutron Spectrometer with Gold Foils written by Felix Mathew and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "During high-energy radiotherapy, secondary neutrons are generated as an unwanted byproduct. It is imperative to accurately determine the neutron spectrum in order to assess the secondary cancer risks posed to the patients by these neutrons. Instruments like the Nested Neutron Spectrometer (NNS) can be used to measure the neutron fluence spectra but the active neutron detector in the spectrometer may be inaccurate when the neutron fluence rate is high due to pulse pileup. Wedeveloped a passive NNS with gold foils that may be operated in high fluence rate environments without suffering from pulse pileup.The passive NNS was used to measure the neutron fluence spectrum at 100 cm from isocentre, along the treatment couch, that was generated by a Varian TrueBeam linac operated at 15 MV. The specific saturation activities of the irradiated gold foils were determined post-irradiation using a high purity germanium detector.To process the measured activities, the response functions of the passive NNS were required. The response functions were generated by first modelling the passive NNS, including moderator shells and gold foils, within the Geant4 v10.4 simulation environment. Simulated irradiations of monoenergetic neutrons were then performed to determine the number of (n,g) neutron capture reactions per unit neutron fluence as a function of neutron energy (i.e. detector response). Theresponse functions generated showed that the detector response shifts to higher energies as the neutron moderator thickness increases, as expected.Using the response functions, the data were iteratively unfolded (i.e. deconvoluted) using the Maximum-Likelihood Expectation-Maximization (MLEM) algorithm to obtain the neutron fluence-rate spectrum at the location of the measurement. The spectrum had two prominent peaks: (i) a dominant peak at the fast neutron energy and (ii) a small peak at the thermal energies. This spectrum was also compared with the spectrum generated with a conventional NNS"--
Author :National Committee on Radiation Protection and Measurements (U.S.) Publisher : ISBN 13 : Total Pages :104 pages Book Rating :4.:/5 (37 download)
Book Synopsis Measurement of Neutron Flux and Spectra for Physical and Biological Applications by : National Committee on Radiation Protection and Measurements (U.S.)
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:
Book Synopsis Measurement of Neutron Flux and Spectra for Physical and Biological Applications by : National Committee on Radiation Protection and Measurements (U.S.)
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:
Author :United States. National Committee on Radiation Protection and Measurements Publisher : ISBN 13 : Total Pages :102 pages Book Rating :4.:/5 (31 download)
Book Synopsis Measurement of Neutron Flux and Spectra for Physical and Biological Applications by : United States. National Committee on Radiation Protection and Measurements
Download or read book Measurement of Neutron Flux and Spectra for Physical and Biological Applications written by United States. National Committee on Radiation Protection and Measurements and published by . This book was released on 1960 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Determination of Corrections to the Neutron Activation of Gold Foils Exposed in Water by : W. Zobel
Download or read book Experimental Determination of Corrections to the Neutron Activation of Gold Foils Exposed in Water written by W. Zobel and published by . This book was released on 1963 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Spectra Evaluation Obtained from the Track-size Distribution on Electrochemically Etched CR-39 Foils by :
Download or read book Neutron Spectra Evaluation Obtained from the Track-size Distribution on Electrochemically Etched CR-39 Foils written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We are studying the relationship between neutron energy and track-size distribution on electrochemically etched CR-39 foils using a two-stage etching procedure. Although the electrochemical etching process alters the track size, we now find that the track diameter is related to the neutron energy even after the second stage (blowup) is completed. This relationship is complex, being effected by the etching parameters, including oven temperature, etching high voltage, and etching time. Current studies are directed at establishing the effect of each of these parameters on the track-size distribution and at determining an optimal etching procedure for neutron spectra evaluation. If neutron spectral information can be determined from the track-size distribution, dose can be calculated directly from the neutron fluence and spectrum.
Book Synopsis Measurement of Neutron Flux and Spectra for Physical and Biological Applications by : National Committee on Radiation Protection and Measurements (U.S.)
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:
Book Synopsis NEUTRON SPECTRA MEASUREMENT IN FAST REACTORS USING FOILS DETECTORS. Part I - Theoretical Considerations by :
Download or read book NEUTRON SPECTRA MEASUREMENT IN FAST REACTORS USING FOILS DETECTORS. Part I - Theoretical Considerations written by and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Technique for Measuring Neutron Spectra in the Range 2.5 to 30 MeV Using Threshold Detectors by : John Clayton Ringle
Download or read book A Technique for Measuring Neutron Spectra in the Range 2.5 to 30 MeV Using Threshold Detectors written by John Clayton Ringle and published by . This book was released on 1963 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Two-plate Method of Measuring Fast Neutron Energy Spectra when the Direction of the Incident Neutrons Cannot be Determined by : John E. Evans
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:
Book Synopsis Neutron spectra measurement in fast reactors using foils detectors by : R. Dierckx
Download or read book Neutron spectra measurement in fast reactors using foils detectors written by R. Dierckx and published by . This book was released on 1956 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Computer-automated Iterative Method for Neutron Flux Spectra Determination by Foil Activation. Volume 1. a Study of the Iterative Method by : W. N. McElroy
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.
Book Synopsis Neutron Spectra Measurement in Fast Reactors Using Foils Detectors by : R. Dierckx
Download or read book Neutron Spectra Measurement in Fast Reactors Using Foils Detectors written by R. Dierckx and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Neutron Spectrum in an AGN-201 Reactor Using a Semiconductor Neutron Spectrometer by : Stanley Elbert Stephenson
Download or read book Measurement of Neutron Spectrum in an AGN-201 Reactor Using a Semiconductor Neutron Spectrometer written by Stanley Elbert Stephenson and published by . This book was released on 1961 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A High-energy Neutron Flux Spectra Measurement Method for the Spallation Neutron Source by : Nicholas Patrick Luciano
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.
Book Synopsis Measurement of Neutron Flux Spectra in a Tungsten Benchmark by Neutron Foil Activation Method by :
Download or read book Measurement of Neutron Flux Spectra in a Tungsten Benchmark by Neutron Foil Activation Method written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Development of a Neutron Spectrometer Using Multi-wire Spark Chambers for the Measurements of the Spectra of Stray Neutrons in the Vicinity of High Energy Accelerators by : Chun Bin Lim
Download or read book The Development of a Neutron Spectrometer Using Multi-wire Spark Chambers for the Measurements of the Spectra of Stray Neutrons in the Vicinity of High Energy Accelerators written by Chun Bin Lim and published by . This book was released on 1973 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
