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Monte Carlo study of the energy response and depth dose water equivalence of the MOSkin radiation dosimeter at clinical kilovoltage photon energies

Journal Article


Abstract


  • Skin dose is often the quantity of interest for

    radiological protection, as the skin is the organ that

    receives maximum dose during kilovoltage X-ray irradiations.

    The purpose of this study was to simulate the energy

    response and the depth dose water equivalence of the

    MOSkin radiation detector (Centre for Medical Radiation

    Physics (CMRP), University of Wollongong, Australia), a

    MOSFET-based radiation sensor with a novel packaging

    design, at clinical kilovoltage photon energies typically

    used for superficial/orthovoltage therapy and X-ray CT

    imaging. Monte Carlo simulations by means of the Geant4

    toolkit were employed to investigate the energy response of

    the CMRP MOSkin dosimeter on the surface of the phantom,

    and at various depths ranging from 0 to 6 cm in a

    30 9 30 9 20 cm water phantom. By varying the thickness

    of the tissue-equivalent packaging, and by adding thin

    metallic foils to the existing design, the dose enhancement

    effect of the MOSkin dosimeter at low photon energies was

    successfully quantified. For a 5 mm diameter photon

    source, it was found that the MOSkin was water equivalent

    to within 3% at shallow depths less than 15 mm. It is

    recommended that for depths larger than 15 mm, the

    appropriate depth dose water equivalent correction factors

    be applied to the MOSkin at the relevant depths if this

    detector is to be used for depth dose assessments. This

    study has shown that the Geant4 Monte Carlo toolkit is

    useful for characterising the surface energy response and

    depth dose behaviour of the MOSkin.

Publication Date


  • 2011

Citation


  • Lian, C. P. L., Othman, M. A. R., Cutajar, D. L., Butson, M., Guatelli, S. & Rozenfeld, A. (2011). Monte Carlo study of the energy response and depth dose water equivalence of the MOSkin radiation dosimeter at clinical kilovoltage photon energies. Australasian Physical and Engineering Sciences in Medicine, 34 (2), 273-279.

Scopus Eid


  • 2-s2.0-80051705203

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1704

Number Of Pages


  • 6

Start Page


  • 273

End Page


  • 279

Volume


  • 34

Issue


  • 2

Abstract


  • Skin dose is often the quantity of interest for

    radiological protection, as the skin is the organ that

    receives maximum dose during kilovoltage X-ray irradiations.

    The purpose of this study was to simulate the energy

    response and the depth dose water equivalence of the

    MOSkin radiation detector (Centre for Medical Radiation

    Physics (CMRP), University of Wollongong, Australia), a

    MOSFET-based radiation sensor with a novel packaging

    design, at clinical kilovoltage photon energies typically

    used for superficial/orthovoltage therapy and X-ray CT

    imaging. Monte Carlo simulations by means of the Geant4

    toolkit were employed to investigate the energy response of

    the CMRP MOSkin dosimeter on the surface of the phantom,

    and at various depths ranging from 0 to 6 cm in a

    30 9 30 9 20 cm water phantom. By varying the thickness

    of the tissue-equivalent packaging, and by adding thin

    metallic foils to the existing design, the dose enhancement

    effect of the MOSkin dosimeter at low photon energies was

    successfully quantified. For a 5 mm diameter photon

    source, it was found that the MOSkin was water equivalent

    to within 3% at shallow depths less than 15 mm. It is

    recommended that for depths larger than 15 mm, the

    appropriate depth dose water equivalent correction factors

    be applied to the MOSkin at the relevant depths if this

    detector is to be used for depth dose assessments. This

    study has shown that the Geant4 Monte Carlo toolkit is

    useful for characterising the surface energy response and

    depth dose behaviour of the MOSkin.

Publication Date


  • 2011

Citation


  • Lian, C. P. L., Othman, M. A. R., Cutajar, D. L., Butson, M., Guatelli, S. & Rozenfeld, A. (2011). Monte Carlo study of the energy response and depth dose water equivalence of the MOSkin radiation dosimeter at clinical kilovoltage photon energies. Australasian Physical and Engineering Sciences in Medicine, 34 (2), 273-279.

Scopus Eid


  • 2-s2.0-80051705203

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1704

Number Of Pages


  • 6

Start Page


  • 273

End Page


  • 279

Volume


  • 34

Issue


  • 2