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For the linearity and background control, it is essential to compare measurement results between beta-ray attenuation and direct weighing method.
This test, known as equivalence evaluation, is mandatory in Korea and is conducted once every two years.
In this study, to perform the equivalence evaluation, we compared measurements with an E-SEQ-FRM manual sampler using the direct weighing method.
We conducted experiments for more than two months and the 24-hour average data measured by two methods were compared.
To calculate standard uncertainty, at first, a linear regression line(y= b1x+b0) is calculated with obtained comparison data.
And the uncertainty variance matrix of the slope and intercept of the regression line is calculated as shown in Equation.
Since the standard uncertainty of linearity factor, includes both the bias of slope and uncertainty of slope, the final standard uncertainty of linearity factor can be calculated as below Equation.
The same goes for intercept.
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IEEE/ICACT20240482 Slide.12
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