LLWR-Uncompactable Waste Monitoring Service Scope: This project is to provide a Quality Assurance (QA) verification of consignors’ waste declarations for LLW consigned to the LLWR repository in ISO containers. A High Resolution Gamma ray Spectrometry methodology has been developed using the In-Situ Object Counting System (ISOCSTM) which is an established flexible tool for quantifying the ß /? activity content. This technique is based on computer modeling of the item under interrogation, in order to represent the counting geometry, with no requirement for radioisotope calibration sources. Measurements were performed at the Low Level Waste Repository (LLWR) in Cumbria, UK. Key Drivers: LLWR Ltd’s key requirement is to verify that ISO containers meet the consignor’s declared info

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