Simplified method for creating a density-absorbed dose calibration curve for the low dose range from Gafchromic EBT3 film

• DOI: 10.4103/0971-6203.195192
• Publication Date: 2016-12-21T11:57:18Z
• Authors: Tatsuhiro Gotanda; Toshizo Katsuda; Rumi Gotanda; Tadao Kuwano; Takuya Akagawa; Nobuyoshi Tanki; Akihiko Tabuchi; Tetsunori Shimono; Yasuyuki Kawaji
• Keywords: Medical physics. Medical radiology. Nuclear medicine; 03 medical and health sciences; 0302 clinical medicine; Calibration curve; diagnostic dose range; radiochromic film; step-shaped Al filter; R895-920; Technical Note

Radiochromic film dosimeters have a disadvantage in comparison with an ionization chamber in that the dosimetry process is time-consuming for creating a density-absorbed dose calibration curve. The purpose of this study was the development of a simplified method of creating a density-absorbed dose calibration curve from radiochromic film within a short time. This simplified method was performed using Gafchromic EBT3 film with a low energy dependence and step-shaped Al filter. The simplified method was compared with the standard method. The density-absorbed dose calibration curves created using the simplified and standard methods exhibited approximately similar straight lines, and the gradients of the density-absorbed dose calibration curves were −32.336 and −33.746, respectively. The simplified method can obtain calibration curves within a much shorter time compared to the standard method. It is considered that the simplified method for EBT3 film offers a more time-efficient means of determining the density-absorbed dose calibration curve within a low absorbed dose range such as the diagnostic range.