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SOURCES OF IONISING RADIATION AND THE NEGATIVE CONSEQUENCES OF RADIATION. TEACHING A PRACTICAL LESSON ON THE TOPIC OF THE EARTH’S NATURAL RADIATION BY THE «CLUSTER» METHOD OF PEDAGOGICAL TECHNOLOGIES IN MEDICAL HIGHER EDUCATION INSTITUTIONS. ReFocus 2023, 2 (5), 16-21. https://doi.org/10.66073/researchfocus.v2i5.183.