Simulation of bomb residue deposition following the Oslo bombing July 22, 2011

The objective of the present study is to simulate the dispersion and make an assessment on the shape and concentration of the deposition of particle residues originating from the improvised explosive device used on July 22, 2011, in Oslo. The results indicate that the bomb residue deposition concentration can be expected to be significantly higher on building surfaces than on the ground. Relatively large particle concentration levels are to be expected on the leeward side of buildings over which the particle cloud has passed. These findings provide valuable insight that can be used when determining the best positions to collect samples in e.g., forensic work. The method used in this study also provides information of the size and shape of the contaminated area, in addition to the variation of local concentration levels. This could be valuable information in conjunction with the aftermath of the use of e.g., dirty bombs.