After completing a one-minute density test, what should you do first upon re-approaching the gauge?

After completing a density test, the first action upon re-approaching the gauge should be to pull the handle to retract the rod back into the safe position. This step is critical for ensuring safety, as the rod used during the density test may be radioactive and could pose a radiation hazard if left extended. Retracting the rod minimizes exposure to radiation for both the operator and anyone nearby.

Additionally, retracting the rod is essential in preventing accidental damage to the gauge and the testing environment. By prioritizing this action, you are following proper safety protocols that prevent potential accidents and ensure the gauge is safely stored before moving on to the next steps, such as examining readings or securing the gauge. Proper sequence and safety measures are crucial when handling nuclear gauges to maintain a safe working environment.