| Autor: |
Dioszegi, Istvan, Salwen, Cynthia, Forman, Leon |
| Zdroj: |
Proceedings of SPIE; May 2011, Vol. 8018 Issue: 1 p80180D-80180D-8, 721629p |
| Abstrakt: |
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. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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