T-REX Design Considerations for Detection of Concealed 238U

Pruet, J ; McNabb, D P

Lawrence Livermore National Laboratory

关键词: Energy Resolution;    Light Sources;    Photons;    Excitation;    42 Engineering;   

DOI  :  10.2172/893990
RP-ID  :  UCRL-TR-219071
RP-ID  :  W-7405-ENG-48
RP-ID  :  893990

美国|英语

来源: UNT Digital Library

【 摘 要 】

Here they outline considerations that might inform choices for the design of a laser/linac-based light source used to detect {sup 238}U via excitation of the resonance at 680.11 keV in this isotope. They assume that the principal concern is speed of interrogation and not, e.g., how much radiological dose is imparted during a scan. It is found that if the photon detectors used in the system have an energy resolution better than or comparable to that of the interrogation beam, then to a first approximation the light source should be designed to have the highest possible specific fluence (photons per unit energy per unit time). there is also a weak dependence of scan time on the number of photons emitted per pulse of the light source. A simple formula describing the tradeoff between specific fluence and number of photons per pulse is presented.