Tutorial: a beginner's guide to fast neutron detection with an EJ-309 detector.

A beginner-focused tutorial shows how to detect and quantify fast neutrons with a single EJ-309 liquid organic scintillation detector using a benchtop deuterium-deuterium fusion reactor.

• Why it matters: Neutron diagnostics is important for nuclear fusion research, but tool complexity has restricted use mainly to specialized communities.
• What they did: The tutorial describes detector setup, calibration, characterization, and data processing for mixed neutron/gamma-ray fields, with fast neutrons produced via a bespoke deuterium-deuterium nuclear fusion benchtop reactor.
• The result: It provides a practical, step-by-step pathway that makes fast-neutron diagnostics more accessible beyond specialized research groups.

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