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The comparison of absorbed dose measurements for water and artificial body fluid
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T. Cakir   , A. Gur , A. Arasoglu |
| , tcakir2003@yahoo.com |
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Abstract: (8586 Views) |
| Background: Advances in radiation dosimetry
concepts and the development of primary measurement
standards based on absorbed dose to water
over the last decades offer the possibility to calibrate
ionisation chambers directly in terms of absorbed
dose to water. The aim of this study is the investigation
on utility of artificial body fluid (ABF) instead of
water by comparing dosimetric measurements for
radiotherapy between water and ABF which is more
close to human tissue. Materials and Methods: The
measurements were done using 60Co gamma source
with a radiation field sizes of 5×5, 10×10, 15×15,
20×20 and 25×25 cm2 at PTW Freiburg MP3 water
phantom front surface. The comparisons of the dose
measurements were obtained by using IAEA TRS-398
dosimetry protocols and Mephysto mc2 dose analyzer
program. Percent depth dose (PDD), dose profiles
and penumbras are compared for water and ABF.
Results: When the results of the PDD for water and
ABF were compared, the maximum difference was
observed in big field sizes. The difference in
penumbras was found 2.3 mm averagely for depth of
maximum dose (dmax). In addition same differences
were observed between water and ABF when the
dose profiles were compared. It is found that PDD
values taken for water are good agreed with PDD
values published in British Journal of Radiology (BJR)
Supplement 25. Conclusion: Since the ABF is more
equivalent to human tissue than water, it is
suggested that advanced dosimetric studies should
be performed with ABF instead of water. Iran. J.
Radiat. Res., 2012 10(3‐4): 157‐164
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| Keywords: Radiation dosimetry, absorbed dose measurement, artificial body fluid. |
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Full-Text [PDF 497 kb]
(4838 Downloads)
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Type of Study: Original Research |
Subject:
Radiation Biology
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