Which of the following publications recommends limits of exposure to ionizing radiation?

The correct option is the publication by the National Council on Radiation Protection and Measurements (NCRP) titled NCRP Report #166. This document specifically focuses on providing recommendations regarding safe limits of exposure to ionizing radiation. It outlines guidelines based on scientific research aimed at protecting individuals and populations from potential harmful effects associated with radiation exposure.

NCRP reports are widely recognized and referenced in the field of radiation protection, serving as essential resources for healthcare professionals and regulatory bodies. Such recommendations are crucial for maintaining safety standards in various environments where ionizing radiation is present, such as healthcare, industry, and research settings.

Other publications mentioned, while relevant to healthcare and radiation safety, do not primarily focus on exposure limits. For example, the ASRT Standards primarily cover educational and professional practice standards for radiologic technologists. FDA Regulations involve the safety and effectiveness of medical devices, including those related to radiation-emitting devices but do not establish exposure limits. WHO Guidelines provide health guidance on a wide range of issues, including public health and safety, but do not specifically set exposure limits for ionizing radiation like the NCRP does.