If simultaneous radon measurements are 6.7 and 9.3 pCi/L, what is their relative percent difference?

To determine the relative percent difference of the simultaneous radon measurements, you follow a specific formula. The relative percent difference (RPD) is calculated using the absolute difference between two values divided by the average of those two values, and then multiplying by 100 to express it as a percentage.

The first step involves finding the absolute difference between the two radon measurements:

Absolute difference = |9.3 - 6.7| = 2.6 pCi/L.

Next, calculate the average of the two measurements:

Average = (6.7 + 9.3) / 2 = 8.0 pCi/L.

Now, you can calculate the relative percent difference:

RPD = (Absolute difference / Average) × 100 = (2.6 / 8.0) × 100 = 32.5%.

The resulting 32.5% represents how much the two measurements differ relative to their average, which provides a meaningful context for comparing their levels. This calculation is important in radon measurements to assess the variability between readings and to ensure the reliability of the data collected during testing.