Lessons from accidental exposures are an invaluable resource for revealing vulnerable aspects of the practice of radiotherapy, and for providing guidance for the prevention of future occurrences. This report provides lessons from retrospective information in Sections 2 and 4.

Describes the terms and methods used to assess the radiation exposure of astronauts, and provides data for the assessment of organ doses.

Provides advice on the application of the Commission's 2007 Recommendations.