Final answer:
The correct ways to check for cracks in lead aprons are visual inspection, fluoroscopy once a year, and radiographing at low kilovoltage twice a year.
Step-by-step explanation:
One of the correct ways to check for cracks in lead aprons is by visual inspection. This can be done by carefully looking for any signs of damage or wear on the surface of the apron. Cracks or holes may be visible, or there may be signs such as fraying or discoloration.
Fluoroscopy is another method that can be used once a year. Fluoroscopy involves using a special imaging technique to visualize the lead apron in real-time. This can help identify any hidden cracks or weaknesses that may not be visible during a visual inspection.
Radiographing the lead aprons at low kilovoltage twice a year can also be an effective method. By using X-ray imaging at a low kilovoltage, any cracks or defects in the apron may show up on the radiograph.