What characteristic feature must a radiographer's dosimeter have?

A radiographer's dosimeter is a critical tool for measuring an individual's exposure to ionizing radiation. It is essential that this device has an alarm function as it serves as a safety mechanism for the wearer. When a dosimeter is equipped with an alarm, it can alert the wearer when radiation exposure reaches a predetermined threshold. This feature is crucial in protecting radiographers from potential overexposure to radiation, allowing them to take immediate action in response to unsafe conditions.

The alarm function aids in maintaining cumulative dose limits, ensuring that radiographers can perform their duties without exceeding health regulations and thus reducing the risk of long-term health effects associated with radiation exposure. This proactive measure is vital for promoting workplace safety in environments where radiation is present.

Other characteristics, while potentially beneficial, do not address the immediate need for safety alerts in radiological practices, making the alarm feature particularly important.