Which method is NOT typically used to evaluate the performance of well counters?

The method of visual inspection is not typically used to evaluate the performance of well counters. While visual assessment may help in identifying obvious physical issues or cleanliness, it does not provide a quantitative measure of performance that is essential for quality control in well counting.

In contrast, using standards with known activity allows for a precise comparison of the well counter's measurements against expected results. This method is crucial for ensuring accuracy and reliability in counting radioactive samples. Cross-checking results against control samples further ensures that the well counter is functioning correctly by validating its readings against established benchmarks. Statistical analysis of detection efficiency provides a quantitative assessment of the counter's performance, allowing for the evaluation of its detection capabilities under varying conditions.

These methods contribute to a robust quality control process, ensuring that the well counters meet the necessary standards for reliable operation in clinical or research settings.