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Book Characterization of Neutron Flux Spectra for Radiation Effects Studies

Download or read book Characterization of Neutron Flux Spectra for Radiation Effects Studies written by Joseph Turner Graham and published by . This book was released on 2011 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of neutron displacement damage on materials are sensitive to neutron energy spectra. In controlled neutron damage experiments, a well characterized neutron flux spectrum is critical in determining the equivalent dose for displacement damage. Two techniques were used to characterize the neutron flux spectra in the University of Texas at Austin TRIGA research nuclear reactor. The first technique uses a standard method of measuring the reaction rates of two identical metal foils, one of which was irradiated in a Cd cover, the other of which was irradiated bare. Assuming an analytic form of the neutron spectrum the reaction rates were used to determine an approximate spectrum. The second technique uses the reaction rates measured from a set of activated metal foils along with two spectral unfolding techniques to approximate and then refine the neutron spectrum. A Matlab code was developed which fits radiative capture reaction rates to an approximate spectrum using a least squares approach. The result was used as an initial guess in a second Matlab code which refines the epithermal and fast energy ranges of the spectrum using reaction rates from threshold reactions. Errors in the reaction rates calculated from the resulting spectrum to the measured reaction rates were used to assess the accuracy of the final neutron spectrum.

Book Measurements and calculations of the neutron spectrum in different irradiation channels of the TRIGA Mark II reactor Slovenia

Download or read book Measurements and calculations of the neutron spectrum in different irradiation channels of the TRIGA Mark II reactor Slovenia written by Radojko Jaćimović and published by . This book was released on 2007 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Measurement of Neutron Flux and Spectra for Physical and Biological Applications

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 Measurement of Neutron Flux and Spectra for Physical and Biological Applications

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 The Energy Spectrum of Leakage Neutrons from a Homogeneous Reactor

Download or read book The Energy Spectrum of Leakage Neutrons from a Homogeneous Reactor written by R. C. Rohr and published by . This book was released on 1951 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Training on Neutron Fluence Rate Measurement in Irradiation Channels in the TRIGA MARK I IPR R1 Reactor Aiming at Neutron Activation Analysis K sub 0 method

Download or read book Training on Neutron Fluence Rate Measurement in Irradiation Channels in the TRIGA MARK I IPR R1 Reactor Aiming at Neutron Activation Analysis K sub 0 method written by Radojko Jaćimović and published by . This book was released on 2016 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Flux and Spectral Measurements of Primary and Moderated Neutron Sources

Download or read book Flux and Spectral Measurements of Primary and Moderated Neutron Sources written by E. Tochilin and published by . This book was released on 1962 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radioactive (a, n) neutron sources include Ra-Be, PuF4, and four PuBe13 sources. Comparative neutron emission rates were determined by two separate methods: (1) the manganese sulfate bath with appropriate corrections made for fast neutron escape or capture and for thermal neutron capture by the source; and (2) long counter measurements corrected for energy response and so rce anisotropy. Agreement to within 1 percent was obtained by the two independent methods. A Ra-Be source calibrated against the NBS neutron standard was used as a primary reference Spectral measurements of PuBe13 and PuF4 neutron sources were made with nuclear emulsions. By the use of cylindrical plastic and lead absorbers, an effort was made to moderate the PuBe13 spectrum and thereby obtain additional calibration points for instrument response studies. Spectral changes were initially studied with the doublemoderator technique, followed by later measurements with nuclear emulsions. From flux and spectral measurements of the primary and moderated radioactive sources, the first collision tissue dose was calculated and, in turn, compared to experimental measurements of absorbed dose with proportional counters designed according to the Bragg-Gray principle. (Author).

Book An Easier Way to a Harder Spectrum

Download or read book An Easier Way to a Harder Spectrum written by Michael T. Pierce (Jr.) and published by . This book was released on 2019 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: The TRIGA Mark II research reactor has a flux spectrum with a predominance of thermal neutrons. While most research can be conducted using this thermal neutron flux, an exclusively fast neutron flux is preferred for some experiments, such as radiation damage studies. Although fast neutron flux spectrums are available using fast reactors or neutron generators, only a few fast reactors are currently in operation and neutron generators tend to have low fluxes. As a result, this report evaluated the possibility of generating a fast neutron flux spectrum in a thermal reactor through the use of an irradiator consisting of layers of uranium, boron, and cadmium. Simulations using Monte Carlo N-Particle Code (MCNP) determined that thin layers of these materials in an irradiator inserted into the 3-Element Facility of the UT-Austin TRIGA reactor will generate a fast neutron flux spectrum with negligible thermal flux and where over 91% of the total flux consists of neutrons with energy greater than 10 keV. Further research is recommended to calculate heat dissipation and to determine the reactivity worth of the irradiator

Book TOP012 Neutron Fluence Rate Measurement in Irradiation Channels in the TRIGA MARK I IPR R1 Reactor Aiming at Neutron Activation Analysis K sub 0 method

Download or read book TOP012 Neutron Fluence Rate Measurement in Irradiation Channels in the TRIGA MARK I IPR R1 Reactor Aiming at Neutron Activation Analysis K sub 0 method written by Radojko Jaćimović and published by . This book was released on 2016 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Characteristics of the LPTR Fast Neutron Irradiation Facility

Download or read book Characteristics of the LPTR Fast Neutron Irradiation Facility written by Garth E. Cummings and published by . This book was released on 1963 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Study of Fission Neutron Spectra with High energy Activation Detectors

Download or read book Study of Fission Neutron Spectra with High energy Activation Detectors written by J. A. Grundl and published by . This book was released on 1963 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: