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Quality indexes based on water measurements for low and medium energy x-ray beams: a theoretical study with PENELOPE
U Chica1, M Anguiano2, M Vilches3
1Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-18071 Granada, Spain and FISRAD S.A.S Carrera 64 a No 22-41, Bogotá D.C., Colombia.
Purpose:
To study the use of quality indexes based on ratios of absorbed doses in water at two different depths to characterize x-ray beams of low and medium energies.
Methods:
A total of 55 x-ray beam spectra were generated with the codes XCOMP5R and SPEKCALC and used as input of a series of Monte Carlo simulations performed with PENELOPE, in which the percentage depth doses in water and the kQ,Q0 factors, defined in the TRS-398 protocol, were determined for each beam. Some of these calculations were performed by simulating the ionization chamber PTW 30010.
Results:
The authors found that the relation between kQ,Q0 and the ratios of absorbed doses at two depths is almost linear. A set of ratios statistically compatible with that showing the best fit has been determined.
Conclusions:
The results of this study point out which of these ratios of absorbed doses in water could be used to better characterize x-ray beams of low and medium energies.
