Final answer:
The minimum number of identification markings that a radiograph must contain is one. The identification marking is typically a label or sticker that includes information such as the patient's name, the date of the radiograph, and any other relevant details.
Step-by-step explanation:
The minimum number of identification markings that a radiograph must contain is one. The identification marking is typically a label or sticker that includes information such as the patient's name, the date of the radiograph, and any other relevant details. This helps to identify the radiograph and ensure it is correctly matched with the patient's medical records.