A novel evaluation technique for radiochromic films based on cosine-distance analysis: Feasibilities of wide range photon dosimetry and postal intercomparison in lieu of conventional TLD chips. (January 2022)

• Record Type: Journal Article
• Authors: Mukherjee, Bhaskar; Bhonsle, Uday
• Is Part Of: Applied radiation and isotopes. Volume 179(2022)
• Publication Date: 2022-01
• Subjects: Cosine-distance -- Photon-dosimetry -- Radiochromic-film -- RGB-colour vector; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2021.110005
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: Photon radiation induced decolourisation of radiochromic film changes its optical density. The photon dose is thereby evaluated as a function of optical density. The detection limit of common radiochromic films lies between 1 cGy and 20 Gy. This paper describes a novel evaluation method of radiochromic films using cosine-distance analysis of the RGB-colour vectors instead of conventional optical density measurements using a scanner in transmission mode. This allows extending the detection limit to excess of 40 Gy. Highlights: Gaf-EBT3 radiochromic films exposed to photons from 6 MV linac. RGB colour histogram constructed using ImageJ program. Cosine-distance (CD) calculated using RGB colour vectors. Photon doses presented as a function of CD.