SP6h Using Radioactivity | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP6h, covering the complete Edexcel Separate Science Physics specification for the five uses of radioactivity: smoke alarms, food irradiation, sterilisation, tracers and thickness gauging (P6.28P).

Topic Mastery Sheet covers all five applications with the type of radiation used for each and the physical reason that radiation type is appropriate - developed as cause-and-effect explanations rather than lists of facts: smoke alarms (alpha ionises air → current; smoke blocks alpha → alarm); food/equipment sterilisation (gamma penetrates completely → kills all microorganisms throughout); tracers - both medical (gamma detected outside body by gamma camera) and industrial (leak in pipe detected by above-ground detector); and thickness gauging (beta partially absorbed by material → changes in detector reading trigger roller pressure adjustments). The key principle - that the choice of radiation depends on matching ionising/penetrating properties to the application’s needs - is made explicit.

Student Exam Practice Sheet includes the tracer oil-pipe leak question (from the standard mark scheme), the smoke alarm mechanism and radiation-choice question, and the gamma sterilisation comparison question. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme with the specific two-step answer required for the pipe tracer question (source added to oil; detector finds highest activity = leak location) and three-step answer for the smoke alarm (ionisation mechanism; smoke blocks radiation; why alpha is chosen).

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