Which of the following is not a type of radiographic equipment that can be sterilized?

The lead apron is considered not a type of radiographic equipment that can be sterilized because it is made from materials that do not lend themselves to the sterilization processes typically used in dental settings. Unlike items such as film holders, which can be cleaned and disinfected between uses, or exposure controls that are generally sealed and can also be disinfected, lead aprons usually consist of a lead lining encased in a protective cover. This cover is not designed to withstand the conditions of sterilization, like high heat or certain chemical agents, which could damage it or render it ineffective.

Exposure controls, too, are typically made from materials that can be cleaned. The film holder is designed to be reused and can be easily sterilized or disinfected, making it suitable for multiple uses. In contrast, the lead apron’s primary function is to protect against radiation during procedures, and while it can be cleaned with appropriate methods between patients, it cannot undergo sterilization like other equipment designed for that purpose.