Close-out report for the Cosmic Ray Inspection and Passive Tomography (CRIPT) project – CRTI 08-0214RD


  1. Waller, D.
  2. Drouin, P.L.
  3. Noel, S.
  4. Cousins, T.
  5. Armitage, J.
  6. Botte, J.
  7. Boudjemline, K.
  8. Erlandson, A.
  9. Oakham, G.
  10. Stocki, T.J.
  11. Charles, E.
  12. Gallant, G.
Corporate Authors
Defence Research and Development Canada, Ottawa Research Centre, Ottawa ON (CAN);Carleton Univ, Ottawa ONT (CAN)
The smuggling of illicit Radiological and/or Nuclear (RN) material into or through Canada is a major national security concern. The Canadian Border Services Agency (CBSA) has excellent systems in place to detect low-level gamma radiation and neutrons, but detecting shielded Special Nuclear Materials (SNM) or highly-shielded radiological sources is very difficult. This difficulty is troublesome, as the consequences of a terrorist attack with an Improvised Nuclear Device (IND) would be catastrophic. The CRIPT project team built and tested a proof-of-concept, fixed-point detection system that employs naturally-occurring radiation (muons from cosmic rays) for detecting SNM and other high-density, high-atomic-number (high-Z) materials. Muons are deflected (or “scattered”) by the SNM or dense shielding material much more than by low-density, low-Z materials (e.g., compared to aluminum, uranium will typically scatter muons at an angle five times greater). Measuring muon scattering through cargo containers allows the imaging of objects inside. To date, the muon momentum, a critical variable in the scattering process, has not been measured by other muon tomography groups around the world. Its measurement should reduce the time required to image a volume by a factor of two. The CRIPT system has a unique momentum spectrometer to address this gap. As well as addressing the issue of smuggled SNM, the system can be used to monitor spent fuel repositories, as part of Canada’s obligati

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radiation detection;muon;tomography;special nuclear material;cosmic ray
Report Number
DRDC-RDDC-2014-R177 — Scientific Report
Date of publication
01 Dec 2014
Number of Pages
Electronic Document(PDF)

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