ABSTRACT
In many national and international publications, recommendations are given on frequencies and tolerances of quality control procedures for brachytherapy. Some books and reports present an extensive description of the required procedures, but the simple repetition of their contents would be out of the scope of this chapter. Comprehensive overviews can, for example, be found in the books and book chapters by omadsen (2000) and Williamson et al. (1994). In this chapter, in general, concise descriptions of these procedures are given in combination with frequency tables that provide medical physicists with useful material to assist with their quality assurance (QA) tasks. e frequencies presented here are essentially taken from previously published AAPM and ESTRO documents, with a short discussion on the dierences in the approaches expressed in their reports. At the end of the chapter, some developments in the paradigms of QA in radiation oncology are discussed. It should be further noted, however, that whenever any national set of (legal) requirements exists, these should be followed. One should be aware that in clinical practice, an increase in test frequency is also required when the stability of a system is suspect or when a specic patient treatment method demands a special accuracy.
