title: A preliminary study on using the radiochromic film for 2D beam profile QC/QA at the THOR BNCT facility.
abstract: The GAFCHROMIC(®) EBT2 dosimetry film has been studied as a rapid QC/QA tool for 2D dose profile mapping in the BNCT beam at THOR. The pixel values of the EBT2 film image were converted to the 2D dose profile using a dose calibration curve obtained by 6-MV X-ray. The reproducibility of the 2D dose profile measured using the EBT2 film in the PMMA phantom was preliminarily found to be acceptable with uncertainties within about ±2 to ±3.5%. It is found that the EBT2 measured dose profile consisted of both gamma-ray components and neutron contributions. Therefore, the dose profile measured using the EBT2 film is significantly different from the neutron flux profile measured using the indirect neutron radiography method. Further study of the influence of neutrons to the response of the EBT2 film is indispensible for the absolute dose profile determination in a BNCT beam.
authors.affiliation: Institute of Nuclear Engineering and Science, National Tsing Hua University, HsinChu, Taiwan.
authors.forename: Ming-Chen
authors.initials: MC
authors.lastname: Hsiao
authors.forename: Wei-Lin
authors.initials: WL
authors.lastname: Chen
authors.forename: Pi-En
authors.initials: PE
authors.lastname: Tsai
authors.forename: Chun-Kai
authors.initials: CK
authors.lastname: Huang
authors.forename: Yuan-Hao
authors.initials: YH
authors.lastname: Liu
authors.forename: Hong-Ming
authors.initials: HM
authors.lastname: Liu
authors.forename: Shiang-Huei
authors.initials: SH
authors.lastname: Jiang
mesh_terms: D016754:Boron Neutron Capture Therapy; D002138:Calibration; D011786:Quality Control; D015203:Reproducibility of Results