The Maryland Archaeological Conservation Lab (MAC Lab) has recently published a guide to x-radiography. MAC Lab is a state-of-the-art archaeological research, conservation, and curation facility located at Jefferson Patterson Park & Museum, the State Museum of Archaeology, in southern Maryland. It serves as a clearinghouse for archaeological collections recovered from land-based and underwater projects conducted by State and Federal agencies throughout Maryland.
Of particular interest to CRM practitioners is that the guide includes a section on incorporating x-radiography in the lab workflow to allow responsible documentation and sampling of corroded metals that are not a conservation priority (and will therefore turn to dust over time).
This is in the Maryland standards that took effect in 2019, and the main point of the x-ray guide is to walk people through the reasoning and logistics of the process.
The guide is available here.