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Characterization of an "Edgeless" Dosimeter for Angular Independent Measurements in Advanced Radiotherapy Treatments

Journal Article


Abstract


  • In this paper, the performance of an “edgeless”

    device is evaluated for use as an angular independent detector for

    dosimetric quality assurance in radiotherapy. The edgeless diodes

    were tested in terms of current–voltage (IV) and capacitance–

    voltage (CV) characteristics, charge collection efficiency and

    radiation hardness. A model of the edgeless device was developed

    to simulate the distribution of the electric field for different

    geometries using technology computer aided design (TCAD). IV

    and CV characteristics of the diodes indicate the appropriate

    operational conditions and provide a means to assess the consistency/

    quality of the edgeless diode technology. TCAD model

    shows good agreement with experimental results demonstrating

    the accuracy of the model in simulating the behavior of the edgeless

    diodes. The charge collection efficiency is evaluated for two of

    the edgeless configurations PP and NP. The angular dependence

    measurements of edgeless devices before and after 2 Mrad irradiation

    shows negligible effect of radiation damage on response as

    a function of the angle. The experimental data are supported by

    the results of the TCAD simulation study, which indicates negligible

    impact of radiation damage from a clinical use perspective.

    Both the experimental and simulated results derived from the

    radiation damage study show minimal degradation (within 4%)

    of the diodes sensitivity.

Publication Date


  • 2019

Citation


  • Alhujaili, S. F., Davis, J. A., Davies, J., Lerch, M. L. F., Rosenfeld, A. B. & Petasecca, M. (2019). Characterization of an "Edgeless" Dosimeter for Angular Independent Measurements in Advanced Radiotherapy Treatments. IEEE Transactions on Radiation and Plasma Medical Sciences, 3 (5), 579-587.

Number Of Pages


  • 8

Start Page


  • 579

End Page


  • 587

Volume


  • 3

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • In this paper, the performance of an “edgeless”

    device is evaluated for use as an angular independent detector for

    dosimetric quality assurance in radiotherapy. The edgeless diodes

    were tested in terms of current–voltage (IV) and capacitance–

    voltage (CV) characteristics, charge collection efficiency and

    radiation hardness. A model of the edgeless device was developed

    to simulate the distribution of the electric field for different

    geometries using technology computer aided design (TCAD). IV

    and CV characteristics of the diodes indicate the appropriate

    operational conditions and provide a means to assess the consistency/

    quality of the edgeless diode technology. TCAD model

    shows good agreement with experimental results demonstrating

    the accuracy of the model in simulating the behavior of the edgeless

    diodes. The charge collection efficiency is evaluated for two of

    the edgeless configurations PP and NP. The angular dependence

    measurements of edgeless devices before and after 2 Mrad irradiation

    shows negligible effect of radiation damage on response as

    a function of the angle. The experimental data are supported by

    the results of the TCAD simulation study, which indicates negligible

    impact of radiation damage from a clinical use perspective.

    Both the experimental and simulated results derived from the

    radiation damage study show minimal degradation (within 4%)

    of the diodes sensitivity.

Publication Date


  • 2019

Citation


  • Alhujaili, S. F., Davis, J. A., Davies, J., Lerch, M. L. F., Rosenfeld, A. B. & Petasecca, M. (2019). Characterization of an "Edgeless" Dosimeter for Angular Independent Measurements in Advanced Radiotherapy Treatments. IEEE Transactions on Radiation and Plasma Medical Sciences, 3 (5), 579-587.

Number Of Pages


  • 8

Start Page


  • 579

End Page


  • 587

Volume


  • 3

Issue


  • 5

Place Of Publication


  • United States