ISOCS TM In-Situ Gamma Spectroscopy Analysis, for Quality Checking Harwell 200 litre LLW drums Scope: This project is to provide Quality Assurance (QA) verification for 200 litre LLW waste drums at Harwell. High Resolution Gamma ray Spectrometry is used, based on the In-Situ Object Counting System (ISOCS) 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 Harwell site in Oxfordshire, UK. Key Drivers: RSRL ’s key requirement is to check the validity of the consignor’s declarations for waste contained in 200 litre drums. This is necessa

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