A preliminary study on using the radiochromic film for 2D beam profile QC/QA at the THOR BNCT facility

作者：Hsiao Ming Chen; Chen Wei Lin; Tsai Pi En; Huang Chun Kai; Liu Yuan Hao^*; Liu Hong Ming; Jiang Shiang Huei

来源：Applied Radiation and Isotopes, 2011, 69(12): 1915-1917.

DOI：10.1016/j.apradiso.2011.04.007

• BNCT
• Epithermal neutron beam
• 20 dose profile
• EBT film
• Gafchromic film

The GAFCHROMIC (R) 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.

• 出版日期2011-12
• 单位清华大学