Journal of Medical Physics
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TECHNICAL NOTE
Year : 2016  |  Volume : 41  |  Issue : 4  |  Page : 266-270

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


1 Department of Radiological Science, Faculty of Health Sciences, Junshin Gakuen University, Fukuoka, Japan
2 Department of Radiological Technology, Faculty of Health Sciences, Butsuryo College of Osaka, Osaka, Japan
3 Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
4 Department of Radiological Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
5 Department of Radiological Technology, Tokushima Red Cross Hospital, Tokushima, Japan
6 Department of Radiology, Kawasaki Medical School Kawasaki Hospital, Okayama, Japan

Correspondence Address:
Tatsuhiro Gotanda
Department of Radiological Science, Faculty of Health Sciences, Junshin Gakuen University, 1-1-1 Chikushigaoka, Minami-ku, Fukuoka 815-8510
Japan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.195192

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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.


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