This report describes the initial results attained during the development of a method to measure the three-dimensional distribution of behind armour debris. The debris is imaged on a cylindrical hologram using a short pulsed laser. The debris distribution is evaluated from the hologram using a variant of tomography, here called shadow tomography. The holographic method which is used to make an image of the debris is described, as well as the sources of error which may influence the result when recording and reconstructing the hologram. An investigation is done of the basic difficulties which arise when reconstructing a three-dimensional distribution from shadow images of opaque objects from different projections. Two tomographic reconstruction algorithms which were developed for this purpose have been tested. In one the product of the backprojections is calculated (the product method), while the other is a variant of the Hough transform (the Hough/Radon method). The product method seems to be most promising. The reconstruction algorithms were used at experiments with direct projections (i.e. without a hologram) with very satisfying results and a first hologram has been made with a less satisfying result. However, many more experiments and further developments have to be made before the method is ready for use. A number of ways to improve the method have also been identified as regards both the holographic technique as well as the reconstruction algorithms.