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 concentratio n for Sr-90 concentrations greater than 20 pCi/L. Sample specific uncertainties are available for data beginning in October 1975 (two sigma).

Envirofacts Table Name(s):

ERM_RESULT

Data Source:

No data source specified.

Properties:

Type: Number
Length:
Decimal Places: System Limit
Optional

Definition Source: Office of Radiation and Indoor Air

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Column Name: CSU

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