A novel method for active fissile mass estimation with a pulsed neutron source

C. Dubi, T. Ridnik, I. Israelashvili, B. Pedersen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Neutron interrogation facilities for mass evaluation of Special Nuclear Materials (SNM) samples are divided into two main categories: passive interrogation, where all neutron detections are due to spontaneous events, and active interrogation, where fissions are induced on the tested material by an external neutron source. While active methods are, in general, faster and more effective, their analysis is much harder to carry out. In the paper, we will introduce a new formalism for analyzing the detection signal generated by a pulsed source active interrogation facility. The analysis is aimed to distinct between fission neutrons from the main neutron source in the system, and the surrounding "neutron noise". In particular, we derive analytic expressions for the first three central moments of the number of detections in a given time interval, in terms of the different neutron sources. While the method depends on exactly the same physical assumptions as known models, the simplicity of the suggested formalism allows us to take into account the variance of the external neutron source - an effect that was so far neglected.

Original languageEnglish
Pages (from-to)62-69
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - 22 Apr 2013
Externally publishedYes


  • Active neutron interrogation
  • Fissile mass estimation
  • Neutron detection
  • Neutron multiplicity method

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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