By Ognyan Ivanov
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If performance is outside the action level, it may demand an action to fix the situation. A quality control test should use appropriate measuring equipment, which must itself have been subjected to maintenance and quality control. Irradiation conditions and measuring procedures should be designed to be suitable to each task, and they are expected to give the best estimate of the particular measured parameter. Because each measurement has an associated uncertainty that depends on several factors, the tolerances established must take that into account.
7 • The consistency between quantities and units A main source of error in dose distribution calculations is the incorrect use of quantities and units required by the dose calculation software. It is essential to verify the correct labeling of the input and output quantities and units. The strength of the sources (activity) may be specified in one of several alternative units, and the user should pay particular attention to this important parameter. Inconsistent use of units could lead to severe errors in the treatment and possibly compromise the expected treatment outcome.
Design of a phantom for the quality control of high dose rate 192Ir source in brachytherapy. Radiotherapy and Oncology, (2007). (82), p. 222-228.  N. A. Ellerbroek, M. Brenner, P. , Practice accreditation for radiation oncology: quality is reality. J Am Coll Radiol, (2006). 3(10): p. 787-92.  G. W. R. , Radiation oncology practice accreditation: the American College of Radiation Oncology, Practice Accreditation Program, guidelines and standards. Crit Rev Oncol Hematol, (2005). 55(2): p.
Applications and Experiences of Quality Control by Ognyan Ivanov