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A light-weight multichannel analyser (MCA)-based $$\gamma $$ γ -ray spectrometer, developed earlier at the Inter University Accelerator Centre, New Delhi, has been used as part of the PG curriculum, to determine the effective atomic numbers for $$\gamma $$ γ attenuation of $$^{137}$$ 137 Cs $$\gamma $$ γ -ray in different types of samples. The samples used are mixtures of graphite, aluminum and selenium...