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The corrections needed are large and not known precisely.","posed_since":"2000","precise":"Determine field-output correction factors for active and passive detectors in photon fields of equivalent square side 2 to 20 mm, where lateral charged-particle equilibrium fails and source occlusion sets in, to a standard uncertainty below 1 percent. Required: detector-specific perturbation factors from Monte Carlo with validated geometry and from independent measurement. An answer is a correction-factor set with that uncertainty.","problem_ref":null,"references":"","settled_by":"Agreement within 1 percent between independent Monte Carlo and primary-standard measurements, such as water calorimetry, in the same small fields.","status_note":"The IAEA and AAPM TRS-483 formalism of 2017 supplies factors, with residual uncertainty above 1 percent for the smallest fields and some detectors.","title":"Detector correction factors in millimetre-scale 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