What type of radiation requires all radiation workers to wear personnel monitoring devices?

Ionizing radiation is the correct answer because it refers to radiation with enough energy to remove tightly bound electrons from atoms, which can lead to cellular damage and other health risks. In environments where ionizing radiation is present, there is a potential for exposure that could have detrimental health effects.

Therefore, personnel monitoring devices are essential for radiation workers to track their exposure levels and ensure their safety. These devices help detect and quantify the amount of ionizing radiation a worker is exposed to over time, enabling the implementation of safety protocols and compliance with regulatory standards.

In contrast, medical dosimetrists, patients, and patient monitoring systems do not pertain to the same need for continuous exposure monitoring in the same way. Medical dosimetrists may be involved in the calculation of radiation doses but may not require monitoring in every context as they are not always directly exposed. Patients are the recipients of radiation for diagnostic or therapeutic purposes, and while they may be monitored for dose limits during procedures, they are not classified as radiation workers. Patient monitoring systems also relate to the assessment of patient conditions rather than the monitoring of radiation exposure for personnel.