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Wednesday, May 13, 2020 | History

2 edition of Design calculations for a 14-MeV neutron collimator found in the catalog.

Design calculations for a 14-MeV neutron collimator

R. A. Lillie

Design calculations for a 14-MeV neutron collimator

by R. A. Lillie

  • 369 Want to read
  • 37 Currently reading

Published by Dept. of Energy, [Office of Energy Technology], Oak Ridge National Laboratory, for sale by the National Technical Information Service, 1978. in Oak Ridge, Tenn, Springfield, Va .
Written in English

    Subjects:
  • Collimators (Optical instrument),
  • Neutrons -- Measurement.

  • Edition Notes

    StatementR. A. Lillie, R. G. Alsmiller, Jr., J. T. Mihalczo.
    SeriesORNL/TM ; 6487, ORNL/TM -- 6487.
    ContributionsAlsmiller, R. G., Mihalczo, J. T., Oak Ridge National Laboratory.
    The Physical Object
    Paginationv, 31 p. :
    Number of Pages31
    ID Numbers
    Open LibraryOL17648839M

      One of the most important applications of the general purpose Monte Carlo N-Particle (MCNPS and MCNPX) codes is neutron shielding design. We employed this method to simulate the shield of a MeV neutron generator used as a thermal neutron source providing an external thermal neutron beam for testing large area neutron detectors developed for diffraction studies in biology and . The application of high yield fast neutron generators involves a health physics problem because no price experimental data on shielding properties of various materials are available [1, 2]. The shielding of 14 MeV neutrons has been a problem in the design and construction of laboratories where a D-T neutron source was used.

    A 14 MeV neutron spectrometer suitable for an ITER-like fusion reactor is conceptually designed on the basis of a recoil proton counter telescope method in oblique scattering geometry. uncertainties of numerical calculations, carry out basic studies on neutron damage to materials. In this respect, the feasibility study of the intense 14 MeV source named “The New Sorgentina Fusion Source (NSFS)” is a necessary step toward its full design and realization to serve as a large scale facility for the fusion community.

    Collimator Design of 15 MeV Linear Accelerator Based Thermal Neutron Source for Radiography Conference Paper (PDF Available) March with 92 Reads How we measure 'reads'. Calculations are for parallel-hole collimators only. Performance of a collimator with the specified design may differ in practice to these calculated values. Sensitivity and resolution values depend on the isotope, detector spatial resolution, crystal thickness and the gap between the collimator and crystal.


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Design calculations for a 14-MeV neutron collimator by R. A. Lillie Download PDF EPUB FB2

Get this from a library. Design calculations for a MeV neutron collimator. [Richard Andrew Lillie; R G Alsmiller; J T Mihalczo; Oak Ridge National Laboratory.].

14 MeV Neutrons: Physics and Applications explores fast neutrons in basic science and applications to problems in medicine, the environment, and security.

Drawing on his more than 50 years of experience working with 14 MeV neutrons, the author focuses on:Cited by: 8. Despite the often difficult and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can offer special insight into nucleus and other materials because of the absence of charge.

14 MeV Neutrons: Physics and Applications explores fast neutrons in basic science and applications to problems in medicine, the environment, and security. Discrete ordinates transport calculations have been completed for several right circular cylindrical stainless steel collimators using a MeV neutron, isotropic, cm radius disc source to approximate a plasma volume source.

Whatever the often troublesome and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can provide specific notion into nucleus and totally different provides because of the absence of value.

14 MeV Neutrons: Physics and Applications explores fast neutrons in main science and functions to points in medicine, the setting, and security.

collimator are calculated with the DORT code and the FENDL/MG multi-group cross section library. It is concluded that the calculated neutron fluence above 14 MeV at the exit of the collimator is times as large as that at the10 cm offset position from the beam axis. KEYWORDS: DT neutron beam, collimator, FNS, DORT, FENDL/MG Fusion Engineering and Design 10 () North-Holland, Amsterdam A SIMPLE CALCULATION METHOD FOR 14 MeV NEUTRON GAP STREAMING Kazuo SHIN and Akira ITOH Department of Nuclear Engineering.

Kyoto Unioersity, Yoshida-honmachi, Sakyo-ku, KyotoJapan A simple formula which describes energy-space distributions of streaming neutrons in ducts and. There are three design targets for the moderator and collimator device including improving thermal neutron fluxes at the sample position, collimating the neutron beam, and reducing the dose of scattered neutrons.

Calculations show that such devices could increase the counting rate at the detector by up to 47% per collimator for a given instrumental resolution.

A simpler design where the silicon wafers support a thin absorbing layer alone is also described and can be used to build very short, high transmission conventional neutron collimators.

A small home made neutron tomography system is operating at the thermal column. The facility is based on a neutron collimator with a measured L/D ratio of 44, a circular aperture of 4 cm as diameter, a neutron flux of 5• n cm-2 s-1 with Cd ratio of about 3.

A cooled CCD (x pixels) and an. In order to calculate the neutron and gamma fluxes, the collimator cells of the MCNP bare channel data set were filled with the above-mentioned materials. Five different Monte Carlo calculation were run: (1) bare channel filled with dry air; (2) collimator, gamma filter box with Bi 2 O 3 (4 cm of thickness), channel filled with dry air; (3).

Despite the often difficult and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can offer special insight into nucleus and other materials because of the absence of charge.

14 MeV Neutrons: Physics and Applications explores fast neutrons in basic science a. The design of neutron radiography collimators is a well-established art, but many facilities have been designed without due regard for the body of experience that already exists.

The principles and practice of neutron radiography collimator design are described, with emphasis on the importance of careful selection of materials. The neutron beam profile for the different collimators is shown in Fig.2, given by detectors at an axial dis-tance of m from the radiator (50cm after the col-limator opening), and at increasing radial distances from the beam center.

All collimators shape a neu-tron beam with a sharp edge, indicated by the inten-sity dropbetween r =1. FZJ holds a PGNAA graphite cell called MEDINA (Multi Element Detection based on Instrumental Neutron Activation), allowing the characterization of L drums.

Fast neutrons are emitted from a D-T pulsed 14 MeV neutron generator and thermalized in graphite to induced radiative captures in. A typical resolution calculation for a parallel beam of MeV neutrons is shown in Fig.

dashed line shows the distinctly non-Gaussian function that results from the geometry alone, while the continuous line includes the effect of keV rectangular smearing due to a 50 μm thick ( μg mm −2) proton radiator. Download: Download high-res image (68KB).

Despite the often difficult and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can offer special insight into nucleus and other materials because of the absence of charge.

14 MeV Neutrons: Physics and Applications explores fast neutrons in basic science and applications to problems in medicine, the envir. Measured and calculated neutron and gamma-ray energy spectra resulting from the transport of ∼14 MeV neutrons through a m-thick lithium hydride slab and through a m-thick lead slab followed by m of lithium hydride are compared.

Also reported are comparisons of the measured and calculated neutron energy spectra behind an m-thick assembly comprised of stainless steel type. Conceptual design and optimization of a back -scatter MeV neutron time-of-flight spectrometer 6. point was found for a D1(i) thickness of cm (total t(D1)=8cm) and a D1-D2 distance of cm.

This gave dE/E (FWHM) = %, with an optimal efficiency = (Note that in. The pin-hole collimator has a simple construction. An aperture is placed at a distance from neutron source in order to establish a L/D ratio of the collimator. For a pin-hole collimator it is necessary a large neutron source that to have an equal neutron flux on its surface in.

A conceptual design for a ‘‘pointing’’ neutron detector that is capable of delivering – Hz countrate of T(D,n) events from triton burnup at a deuterium.Evaluation of a continuously variable collimator for 14 MeV neutrons.

Beach JL, Kelsey CA. This paper presents an evaluation of a continuously variable collimator for 14 MeV neutrons. Beam profiles measured in air and a phantom are used to demonstrate the relative importance of patient scatter and collimator throat scatter as they limit the.calculation, using the geometry shown in Figure 1, demonstrates the difference.

A comparison can be made for a hypothetical design that allows the leaves of an MLC to reach a total of 15 cm across a field midline and retract to the outer edge of a 40 cm wide field. For the Varian geometry where the collimator is mounted in a tertiary position with.