Plutonium Test Plan ORNL-VNIIEF Collaboration Page: 3 of 11
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Plutonium Test Plan
1 Test Objective
The goal of this test is to collect the cross correlation and HOS signatures from four detectors,
arranged in a tetrahedron about different plutonium objects during the ORNL/VNIIEF collab-
orative measurements in Sarov, Russia. The four detectors will be arranged in a tetrahedron as
shown in Figure 1. (The plutonium object is not shown for clarity but would be in the center of
the tetrahedron.) The following constraints about the detector geometry should be adhered to
#1 r12=60 cm #
Figure 1: Top View of 4 Detectors in a Tetrahedron
" the base of the tetrahedron (detectors #1, #2, and #3) should have 3 identical detectors
(preferably 4 in. x 4 in., plastic scintillators) placed in an equilateral triangle,
" the length of one side of the base should 60 cm (R12 = R23 = R13 = 60 cm)
" the ideal height of the fourth detector above the base is 2/3 of the side of the equilateral
triangle (height = 2/3 (60 cm) = 49 cm), and finally,
" any mismatched detector should be placed at the apex of the tetrahedron (i.e. top position).
The collected signatures will be processed later. In order to perform the post processing,
the peak efficiencies and neutron thresholds for each detector must be obtained by performing a
standard Time-of-Flight measurement. Secondly, the response matrix data must be benchmarked
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Chiang, L.G. & Mihalczo, J.T. Plutonium Test Plan ORNL-VNIIEF Collaboration, report, June 6, 2000; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc711153/m1/3/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.