What characteristic of a control booth helps reduce radiation exposure?

The characteristic of a control booth that helps reduce radiation exposure is its construction, particularly when it is made of lead. Lead is a dense material that effectively blocks various forms of radiation, including x-rays. By incorporating lead into the walls or other structures of the control booth, radiation levels inside the booth can be significantly minimized, providing a safer environment for the operators or technicians who need to work nearby while the x-ray equipment is in operation.

While the other options mention important considerations for safety and operational efficiency, they do not specifically address the direct shielding from radiation. The location being away from the examination room and the allowance for remote operation do contribute to reducing exposure risks, but these methods are indirect. The use of special glass in windows can also play a role in radiation protection, though it would not be as effective as a lead-lined booth. Thus, the primary benefit stems directly from the lead construction, making it a definitive solution for reducing radiation exposure.