What type of dosimeter measures dose to the hand and forearm?

The correct choice is an extremity dosimeter, which is specifically designed to measure the radiation dose received by the hands and forearms of individuals working with or around radioactive materials. These dosimeters are crucial for monitoring levels of exposure in areas where workers may handle sources of radiation directly, as the hands and forearms can receive significantly higher doses compared to other parts of the body during certain tasks.

Extremity dosimeters often come in the form of rings or wristbands that are worn on the extremities, providing a direct measurement of the radiation exposure in those specific areas. This is important for maintaining safety and ensuring that exposure limits are not exceeded, helping to protect the health of individuals in environments where radiation exposure is a concern.

The other types of dosimeters are designed for different monitoring purposes. A neutron dosimeter specifically measures neutron radiation, which is a different type of exposure. Whole body dosimeters are used to assess the overall radiation dose received by the entire body, focusing on the torso and vital organs rather than specific extremities. Similarly, a collar dosimeter typically measures exposure to the head and neck area, rather than the hands and forearms. Thus, each of these dosimeters serves unique and specialized roles in radiation safety monitoring.