Muography with Symmetric Background Subtraction

Radiographic analysis of the cosmic muon flux measured by the underground or surface detectors is usually based on the subtraction of the uninteresting background flux obtained by the Monte-Carlo simulation or by direct free-sky muon flux measurement. In this contribution we promote a new method based on exploring the intrinsic acceptance symmetry of the muon detector and using the symmetric features of the object (or overburden) being studied. We show, that discrete reflection or rotational sym- metries of the muon detector (acceptance) can be utilized for directly obtaining the inhomogeneity maps of the objects studied, provided the overburden (background) or the geometry of objects (e.g. pyramids) being studied exhibit internal symmetries. We suggest, that design of the muon detector (its acceptance and location) can be optimized in such a way, that a simple data-based angular muon flux subtraction may directly reveal the presence of the explored object inhomogeneities.