Gamma/neutron analysis for SNM signatures at high-data rates (greater than 10^7 cps) for single-pulse active interrogation
2011
We are developing a high data gamma/neutron spectrometer suitable for active interrogation of special nuclear materials
(SNM) activated by a single burst from an intense source. We have tested the system at Naval Research Laboratory's
(NRL) Mercury pulsed-power facility at distances approaching 10 meters from a depleted uranium (DU) target. We
have found that the gamma-ray field in the target room "disappears" 10 milliseconds after the x-ray flash, and that
gamma ray spectroscopy will then be dominated by isomeric states/beta decay of fission products. When a polyethylene
moderator is added to the DU target, a time-dependent signature of the DU is produced by thermalized neutrons. We
observe this signature in gamma-spectra measured consecutively in the 0.1-1.0 ms time range. These spectra contain the
Compton edge line (2.2 MeV) from capture in hydrogen, and a continuous high energy gamma-spectrum from capture or
fission in minority constituents of the DU.
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