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The main aim of this paper was to evaluate uncertainty for low level tritium measurements in monthly precipitation collected at PC NFS site and to clarify quality control procedures which provide reasonable assurance that the analytic results obtained are valid and accurate. Determination of tritium concentration in precipitation sample was conducted using liquid scintillation counter Quantulus 1220. The most important sources of uncertainty are discussed. Four different internal quality control methods have been presented and explained in detail.
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