Mapping Ground-Level Radiation Fields with DREO's Airborne Gamma-Ray Spectrometer
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
Pagination or Media Count:
An algorithm is developed and tested that infers a ground contamination pattern from the dose rate patterns measured by DREOs Airborne Gamma-ray Spectrometer. This algorithm is based on a least-squares minimization, and uses Micro shield 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 contamination, 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 analyzing the data from such a platform.
- Nuclear Instrumentation
- Nuclear Physics and Elementary Particle Physics