Gamma Ray Measurement Information Barriers for the FMTT Demonstration System Page: 3 of 9
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Gn-m. Ray Mlasuramnn I nf an Bflrr4are far thn FMTT
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Demonstration System
Fissile Material Transparency Technology Demonstration, Los Alamos
National Laboratory, August 16, 2000.
James K. Wolford, Jr., Lawrence Livermore National Laboratory
introduction and Scope
The gamma ray attribute measurement information banner dscussion directly
complements the discussion of gamma ray measurement, presented in the measurements
paper by Gosnell and the general discussion of information barriers (Is) by MacArthur.
It focuses on the information barrier features applied specifically to the gammia-ray
measurement and attribute analysis system. The rMUTTi demonstration instrument
represents the second application of an in design paradigm ucvciuped in conjun.tiU
with the Joint DUE/DoD Information Barriers Working Group (iD YG) as well as
representatiVes from the Russian Federation's delegations to the Trilateral initiative and
meetings on the agreement for transparency at the Mayak Fissile Storage Facility
(FMSF). It is also the second evolutionary step in constructing hardware to embody these
jointly developed ideas. The first step was the prototype instrument developed for the
Trilateral Initiative, the so-called Attribute Verification System with information Barriers
for Plutonium with Classified Characteristics utilizing Neutron Multiplicity Counting and
High-Resolution Qamma-ray Spectroscopy (AVNG), that was demonstrated at Los
Alamos National Laboratory in June 1999. Several improvements are evident in his
second effort, and will be discussed below. Improved, though this information barrier
may be, it is still a prototype meant only for demonstration purposes. Its evolving
specification and design are appropriately a subject for joint discussion and development.
Part of that development must include creating components that the respective
governments can trust enough to certify.
System Overview
The illustration shows an overview of the gamma-ray attribute measurement system,
including one of the two gamma-ray detectors to be used in this demonstration. Features
of the information barrier are present in each of the elements shown, and the remainder of
this commentary will them in some detail. To summarize these features, they include:
" Restricted energy windows which limit the range of gamma-ray spectrum data
present in the computers that derive the attributes.
* Reduced functionality (single board) computer and its custom software.
" Tungsten iris
* RF shielding surrounding the detector, detector pre-amp, tungsten iris, and iris
controller.
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Wolford, J. K., Jr. Gamma Ray Measurement Information Barriers for the FMTT Demonstration System, report, August 16, 2000; California. (https://digital.library.unt.edu/ark:/67531/metadc738397/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.