Auto-development issue in quality assurance of biological X-ray irradiator using Gafchromic EBT3 film

Abstract

Radiochromic films are convenient dosimeters for quality assurance of biological X-ray irradiators. However, their calibration curves (optical density vs. radiation dose) can have relatively short lifespans due to non-catalytic auto-development. In the present work, “corrected” calibration curves were proposed, which were constructed based on the darkness of the unexposed film before non-catalytic development. The “corrected” calibration curves enabled the use of a previous calibration curve which had expired due to non-catalytic development. Keywords: Radiochromic film, EBT3 film, Biological X-ray irradiator, Radiobiology