MCNP-POLIMI Evaluation of Time Dependent Coincidence Between Detectors for Fissile Metal Vs. Oxide Determination Metadata

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Title

  • Main Title MCNP-POLIMI Evaluation of Time Dependent Coincidence Between Detectors for Fissile Metal Vs. Oxide Determination

Creator

  • Author: Pozzi, S. A.
    Creator Type: Personal
  • Author: Mihalczo, J. T.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of the Assistant Secretary for Defense Programs.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Defense Programs (DP) (United States)

Publisher

  • Name: Oak Ridge Y-12 Plant
    Place of Publication: Tennessee
    Additional Info: Oak Ridge Y-12 Plant, TN (United States)

Date

  • Creation: 2002-06-03

Language

  • English

Description

  • Content Description: In the past, passive Nuclear Materials Identification System (NMIS) measurements on plutonium metal shells at VNIIEF have shown the sensitivity of the acquired covariance functions to shell mass and thickness for a variety of shell thicknesses from 6 to 30 mm and masses varying from 1829 to 4468g. The technique acquires the time-dependent coincidence distribution between plastic scintillators detecting radiation from the Pu. The measurements showed the sensitivity of the acquired signature to the different spontaneous emission, attenuation, and multiplication properties of the shells. In this work, the MCNP-POLIMI neutron and photon transport code was used to simulate passive measurements on plutonium metal and oxide. The code is a modified version of MCNP, which attempts to calculate more correctly quantities that depend on the second moment of the neutron and gamma distributions, and attempts to model detector pulses as closely as possible. MCNP-POLIMI, together with a post-processing code, can simulate all the time-dependent coincidence distributions measured by NMIS. In particular, the simulations evaluate the time-dependent coincidence distributions between detectors for plutonium samples having mass 2 and 4 kg, in metal and oxide form. This work shows that the time-dependent coincidence distributions between two scintillators measured by NMIS can be used to distinguish metal from oxide.
  • Physical Description: vp.

Subject

  • Keyword: Attenuation
  • Keyword: Neutrons
  • Keyword: Oxides
  • Keyword: Radiations
  • Keyword: Thickness
  • Keyword: Sensitivity
  • Keyword: Plutonium
  • STI Subject Categories: 11 Nuclear Fuel Cycle And Fuel Materials
  • Keyword: Plastic Scintillators
  • Keyword: Nuclear Materials Management
  • Keyword: Identification Systems
  • Keyword: Photon Transport
  • Keyword: Distribution
  • Keyword: Evaluation

Source

  • Conference: Institute of Nuclear Materials Management Annual Conference, Orlando, FL (US), 06/23/2002--06/27/2002

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: Y/LB-16,131
  • Grant Number: AC05-00OR22800
  • Office of Scientific & Technical Information Report Number: 799509
  • Archival Resource Key: ark:/67531/metadc742572
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