Final answer:
A scanner is used to digitize analog X-ray films for storage in a PACS system. Xerography is unrelated to this process, which has evolved from early radiation detection methods like Becquerel's photographic plate.
Step-by-step explanation:
To scan an analog X-ray film into a Picture Archiving and Communication System (PACS), you would use a device known as a scanner. This is because scanners are designed to convert analog images, such as those found on X-ray films, into digital format, which can then be uploaded and stored in a PACS system. Although xerography is an important technology used in copy machines, which work on the principle of electrostatic processes, it is not directly related to scanning X-ray films into PACS. Becquerel's fogged photographic plate illustrates the initial way ionizing radiation was directly detected, but advancements in technology have led to digital systems for storing such medical imagery.