Abstract. Muon radiography is a method of study the internal structure of large natural and industrial objects based on sensing an object with a flux of cosmic muons with their subsequent registration and analysis of the pattern of their dispersion, or conplete (or partial) absorption.The Lebedev Physical Institute of the Russian Academy of Sciences and the Skobeltsyn Institute of Nuclear Physics of Moscow State University have started a series of muon radiography experiments with nuclear emulsion detectors. As a result, the optimal conditions for experiment arrangement have been determined, algorithms of data processing have been worked out, and peculiarities of the method have been ultimately investigated.
We present a very brief overview of some recent γ-ray observations of selected blazars to reveal an indication for a considerable or even dominant contribution of secondary γ-rays from electromagnetic cascades to the observable spectra in the 1-500 GeV energy range.
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