What is the main purpose of periodically calibrating a nuclear gauge?

The primary goal of periodically calibrating a nuclear gauge is to ensure accurate density measurements of test materials. Calibration is essential because over time, factors such as mechanical wear, environmental conditions, or changes in the radioactive source can affect the gauge's readings. By regularly calibrating the instrument, operators can confirm that it is providing reliable data, which is crucial for applications like construction, soil compaction, and other material testing processes. Accurate density measurements are vital for quality control and compliance with standards, thus making calibration a fundamental aspect of nuclear gauge operation.