Mapping ground-level radiation fields with DREO's airborne gamma-ray spectrometer


  1. Haslip. D.S.
  2. Cousins, T.
  3. Jones, T.A.
  4. Boutelloux,
  5. Dhermain, J.
  6. Clifford, E.T.H.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Delegation Generate pour l'Armement, Centre d'Etudes du Bouchet (France);Bubble Technology Industries, Chalk River ONT (CAN)
An algorithm is developed and tested that infers a ground contamination pattern from the dose rate patterns measured by DREO's Airborne Gamma-ray Spectrometer. This algorithm is based on a least-squares minimisation, and uses Microshield calculations of dose rates as a function of altitude over a patch of contaminated ground. The algorithm is successful in that it correctly identifies regions of high and low contamiantion, which would permit a commander to identify areas to avoid, or paths to follow through a non-uniformly contaminated region. However, the contamination pattern predicted by this algorithm is not a high-fidelity facsimile of the actual distribution. The reason for this deficiency is likely that the problem of calculating ground-level contamination patterns from airborne measurements is inherently underdetermined, and evidence is presented to this effect. These results demonstrate clearly the utility of airborne survey for military purposes, and a method of analysing the data from such a platform.
Aerial surveys;Radiation field mapping;Least Squares Minimisation;Direction Set method;Powell's method;Airborne survey;Radiation survey;Radiation reconnaissance
Report Number
DREO-TM-2000-121 — Technical Memorandum
Date of publication
01 Dec 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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