Abstract
Bang Goes the Theory is a popular BBC television science magazine series in the UK that has, in fact, been referred to previously in the present publication in an interview with one of its former presenters (2010 Phys. Educ. 45 298). In a recent episode, a range of modern scientific techniques for the diagnosis and treatment of cancer was examined. One segment in particular examined the technique of external beam radiotherapy, in which x-rays may be directed toward the patient from a variety of angles to maximize the irradiation of the tumour site and minimize that of healthy tissue within the body. This, in turn, leads to cell death (or at least the cessation of cell reproduction) by the ionization of DNA within the nucleus.
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