Which term refers to the agreement between two duplicate tests in radon measurement?

The term that refers to the agreement between two duplicate tests in radon measurement is precision. Precision specifically denotes the extent to which repeated measurements under unchanged conditions yield the same results. In the context of radon testing, having high precision means that if two separate tests are conducted using the same method and conditions, the results will be very similar or close to each other, indicating a reliable measurement process.

In contrast, accuracy refers to how close a measurement is to the true value or the actual level of radon present. Reliability often encompasses both precision and accuracy but is more focused on the overall dependability of a method over time and across different conditions. Consistency, while related, generally refers to the uniformity of results rather than the numerical agreement of duplicate tests. Thus, precision is the most fitting term when discussing the agreement of repeated measurements in radon testing.