LiF TLD-100 as a dosimeter in high energy proton beam therapy--can it yield accurate results?

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
John R ZulloM T Gillin

Abstract

In the region of high-dose gradients at the end of the proton range, the stopping power ratio of the protons undergoes significant changes, allowing for a broad spectrum of proton energies to be deposited within a relatively small volume. Because of the potential linear energy transfer dependence of LiF TLD-100 (thermolumescent dosimeter), dose measurements made in the distal fall-off region of a proton beam may be less accurate than those made in regions of low-dose gradients. The purpose of this study is to determine the accuracy and precision of dose measured using TLD-100 for a pristine Bragg peak, particularly in the distal fall-off region. All measurements were made along the central axis of an unmodulated 200-MeV proton beam from a Probeat passive beam-scattering proton accelerator (Hitachi, Ltd., Tokyo, Japan) at varying depths along the Bragg peak. Measurements were made using TLD-100 powder flat packs, placed in a virtual water slab phantom. The measurements were repeated using a parallel plate ionization chamber. The dose measurements using TLD-100 in a proton beam were accurate to within +/-5.0% of the expected dose, previously seen in our past photon and electron measurements. The ionization chamber and the TLD rel...Continue Reading

References

Sep 28, 2001·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·T C ChuJ P Li
Sep 9, 2004·Radiation Protection Dosimetry·S VynckierUNKNOWN International Commission on Radiation Units and Measurements

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Citations

Feb 1, 2015·International Journal of Radiation Oncology, Biology, Physics·Nicolas DepauwHsiao-Ming Lu
Aug 18, 2017·Physics in Medicine and Biology·Natalia KostiukhinaBarbara Knäusl
Dec 17, 2010·World Journal of Radiology·Matthew T Studenski, Ying Xiao
Jan 16, 2015·Physics in Medicine and Biology·Landon WoottonSam Beddar
Jan 19, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Keisuke YasuiNaoki Hayashi

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