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Column Name: CSU


Description: The Combined Standard Uncertainty (CSU) is the estimated standard deviation of the result. The CSU can be used to estimate the "confidence interval" around the amount. Thus, if y is the "best estimate" of measured radioactivity, the 95% confidence interval around y ranges from about y-(2xCSU) to y+(2xCSU). For Strontium-90 in milk during the period of 1960 through July 1978, the uncertainties were +/- 2 pCi/L (two sigma) for Sr-90 concentrations less than 20 pCi/L, and 10% of the concentration for Sr-90 concentrations greater than 20 pCi/L. Sample specific uncertainties are available for data beginning in October 1975 (two sigma).


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    Definition Source:National Air and Radiation Environmental Laboratory (NAREL)