Neutron response of GafChromic® EBT2 film.

Phys Med Biol

Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu, 30013 Taiwan.

Published: March 2013

AI Article Synopsis

  • Neutron and gamma-ray mixed field dosimetry is a complex area of study, particularly with the rise of high-energy radiotherapy technologies.
  • The research focused on evaluating the GafChromic® EBT2 film in different medical beam setups, revealing its effectiveness in measuring mixed radiation fields due to its favorable characteristics like linearity and reproducibility.
  • The study found that while the relative effectiveness of fast neutrons varies, thermal neutrons have a consistent response value, indicating the EBT2 film is suitable for applications in mixed field dosimetry.

Article Abstract

Neutron and gamma-ray mixed field dosimetry remains one of the most challenging topics in radiation dosimetry studies. However, the requirement for accurate mixed field dosimetry is increasing because of the considerable interest in high-energy radiotherapy machines, medical ion beams and BNCT epithermal neutron beams. Therefore, this study investigated the GafChromic® EBT2 film. The linearity, reproducibility, energy dependence and homogeneity of the film were tested in a (60)Co medical beam, 6-MV LINAC and 10-MV LINAC. The linearity and self-developing effect of the film irradiated in an epithermal neutron beam were also examined. These basic detector characteristics showed that EBT2 film can be effectively applied in mixed field dosimetry. A general detector response model was developed to determine the neutron relative effectiveness (RE) values. The RE value of fast neutrons varies with neutron spectra. By contrast, the RE value of thermal neutrons was determined as a constant; it is only 32.5% in relation to gamma rays. No synergy effect was observed in this study. The lithium-6 capture reaction dominates the neutron response in the thermal neutron energy range, and the recoil hydrogen dose becomes the dominant component in the fast neutron energy region. Based on this study, the application of the EBT2 film in the neutron and gamma-ray mixed field is feasible.

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Source
http://dx.doi.org/10.1088/0031-9155/58/5/1391DOI Listing

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