What is an essential feature of dosimetry badges?

An essential feature of dosimetry badges is that they record accumulated dose over time. These badges are specifically designed to measure the amount of radiation exposure an individual has received over a defined period, typically worn by personnel in environments where they may be exposed to radiation, such as in medical or nuclear facilities.

The ability to track accumulated dose is crucial for ensuring safety and compliance with regulatory standards, as it allows for the monitoring of radiation exposure levels and helps prevent excessive exposure that could lead to health risks. Dosimetry badges store this data and can later be analyzed to provide insights into the radiation dose history for the wearer.

The other options highlight aspects that do not align with the primary function of dosimetry badges. For instance, the idea that they are made to be disposable contradicts their purpose; many dosimetry badges can be reused or are designed for specific intervals of wear. Additionally, the notion that they are only used in emergency situations inaccurately represents their ongoing use in routine monitoring, and the design to block radiation undermines their function as a measurement tool rather than a shielding device.