24.3.4—That, in PET scanning, positrons emitted by the decay of the tracer

explain that, in PET scanning, positrons emitted by the decay of the tracer annihilate when they interact with electrons in the tissue, producing a pair of gamma-ray photons travelling in opposite directions.

Use —that, in pet scanning, positrons emitted by the decay of the tracer to connect the rule to the data and decision in the question.

This matters because —that, in pet scanning, positrons emitted by the decay of the tracer determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —that, in pet scanning, positrons emitted by the decay of the tracer to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —That, in PET scanning, positrons emitted by the decay of the tracer is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.