الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Small field sizes are considered as a big challenge for medical physicists that are concern about
researches of dosimetry systems, as new radiotherapy techniques such as Stereotactic Radiotherapy
and Radiosurgery, and IMRT associated with small field sizes implementations.
As a result of new inventions and new radiotherapy methods, numerous detectors are developed to
keep up with investigations in small field sizes dosimetry. Previous investigations for the output
factors for these developed detectors encountered difficulties because of non-equilibrium radiation
conditions in small field sizes.
According to this perspective, we are motivated to measure the output factors of new developed
various detectors, which are commonly used in small field sizes dosimetries, and calculate the
associated field factors by applying Monte Carlo (MC) correction factors.
It worth to be mentioned that all investigations are followed the standards to IAEA TRS483 2016
protocol. Collimator of CK machine is used for all OFmeasurements, for each detector under
investigations, by using 800 mm SSD, 15 mm depth, and Tandom water phantom.
We observed that the applicability of PTW60019 MicroDiamond (MD) and W1 scintillation
detectors are favorable over the others in term of comparison of the accuracy of the associated output
factors in small field sizes. The impact of our results will reflect on medical physics researches that
are used the new radiotherapy techniques for treating cancer cases. This is extremely important since
its main application impacts patient care.