BS ISO 18315:2018,Nuclear energy — Guidance to the evaluation of measurement uncertainties of impurity in uranium solution by linear regression analysis.
Yesterday, I found this standard in a forum, and thank that selfless sharer. Let’s briefly introduce this standard.
BS ISO 18315:2018 provides a method for evaluation of the measurement uncertainty arising when an impurity content of uranium solution is determined by a regression line that has been fitted by the “method of least squares”.
It is intended to be used by chemical analyzers.
Principle
In practice, a single regression line fitting will be run for calibration. Nevertheless, supposing that the regression line fitting is repeated using a”new set of n different reference solutions”each time,the slope and intercept of the fitted regression line will be different each time; as a result, it can be observed that the predicted y value varies according to an approximately normal distribution. Such a possible variation of the predicted y value is the cause of the calibration uncertainty that arises during the regression line fitting. In this regard, there is a helpful statistical theory. With the aid of that theory,although calibration experts do not repeat the regression line fitting, they can estimate the variance of the predicted y value using only one set of n data points that have been used for a regression line fitting.
BS ISO 18315:2018 can be downloaded for free on www.freestandardsdownload.com