Measuring radioactivity in waste NPL has developed a mock radioactive waste drum traceable to national standards so nuclear decommissioning teams can test their procedures for characterising potentially radioactive waste, providing increased confidence in how this is measured. This work was funded by the National Measurement System (NMS). Background Accurate measurement of radioactivity in waste materials is a major challenge in site decommissioning. Waste on a typical site ranges widely, both in activity level and physical form, and it is usually impractical to prepare a range of standard sources which match all the samples. To deal with this, nuclear sites oftenuse modelling software to predict detector responses, although some sites prepare their own 'in-house standards'. The overestima

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