Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface and buildup region dose measurements with Markus parallel-plate
  ionization chamber, Gafchromic EBT3 film and MOSFET detector for high energy
  photon beams   The aim of the study was to investigate surface and buildup region doses for
6MV and 15MV photon beams using a Markus parallel-plate ionization chamber,
GafChromic EBT3 film, and MOSFET detector for different field sizes and beam
angles. The measurements were made in a water equivalent solid phantom at the
surface and in the buildup region of the 6MV and 15MV photon beams at 100 cm
source-detector distance for 5 x 5, 10 x 10, and 20 x 20 cm2 field sizes and 0,
30, 60, and 80 beam angles. The surface doses using 6MVphoton beams for 10 x 10
cm2 field size were found to be 20.3%, 18.8%, and 25.5% for Markus chamber,
EBT3 film, and MOSFET detector, respectively. The surface doses using 15MV
photon beams for 10 x 10 cm2 field size were found to be 14.9%, 13.4%, and
16.4% for Markus chamber, EBT3 film, and MOSFET detector, respectively. The
surface dose increased with field size for all dosimeters. As the angle of the
incident radiation beam became more oblique, the surface dose increased. The
effective measurement depths of dosimeters vary; thus, the results of the
measurements could be different. This issue can lead to mistakes at surface and
buildup dosimetry and must be taken into account.

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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ