SP6d Background Radiation | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP6d, covering the complete Edexcel Separate Science Physics specification for background radiation, its origins and methods of detection (P6.12, P6.13, P6.14).

Topic Mastery Sheet covers the definition of background radiation (low-level ionising radiation always present from natural and artificial sources) with a table of UK sources and approximate percentages (radon ~50%, medical ~15%, ground ~13%, food ~12%, cosmic ~10%); how photographic film and Geiger–Müller tubes work as detectors; and the requirement to subtract the background count rate from measured count rates to obtain the corrected count - including the worked example from the beta-absorption experiment that appears in the standard and higher mark schemes (background = 120 counts/min; 680 − 120 = 560 corrected for 39 cards; change = 163).

Student Exam Practice Sheet includes the complete beta-absorption table from the exam, requiring students to calculate corrected count rates and changes for 39 and 52 cards; a two-mark background count definition question; a two-mark trend description (decreases; non-regularly; 39-card result is anomalous); and a two-mark improvement question. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme with specific numerical answers for the table completion (560, 163, 456, 104), and notes that the background count definition must reference “natural sources” for the second mark - the count rate alone scores only one mark.

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