4-6 February 2019
Centara Grand at Central Ladprao
Asia/Bangkok timezone
Deadline for full paper revision: 21 May 2019.

Assessment of Colorimetric Reading out Methods for Radiochromic Film and Red Radiation-Sensitive Poly-Methylmethacrylate.

5 Feb 2019, 14:00
20m
Centara Grand

Centara Grand

Oral Physics Oral 5

Speaker

Mr Teesit Varapaskul (Dept. Imaging and Printing Technology, Faculty of Science, Chulalongkorn University)

Description

This research is aimed to introduce and to compare 3 methods of reading out and analysing light blue radiochromic film (BLF) dosimeter and red radiation-sensitive poly-methylmethacrylate (PMMA). BLF and red radiation-sensitive PMMA act as a colour detector which its colour changes after being irradiated. These dosimeters are usually used in food irradiation for process control during irradiation process. We used camera-based measurement in a constraint condition, scanner-based measurement with our own software (Trichromatic Colour Analyser, TCA) and spectrophotometer for obtaining colorimetric data of both dosimeters which were non-irradiated and irradiated in 5 different doses: 5, 10, 15, 20 and 25 kGy, ranged for food application. There were strong linear relationships, for all 3 methods, between doses, given to BLF, and lightness (CIE L$^*$), chroma (CIE C$^*$) and yellowness-blueness (CIE b$^*$). For red radiation-sensitive PMMA, strong linear relationships were found between doses and redness-greenness (CIE a$^*$) as well as CIE C$^*$ in both TCA and spectrophotometer methods. The doses and CIE L$^*$ gave strong relationship only in the spectrophotometric method.

Primary authors

Pichayada Katemake (Faculty of Science, Chulalongkorn University) Mr Teesit Varapaskul (Dept. Imaging and Printing Technology, Faculty of Science, Chulalongkorn University) Dr Razvan Preda (Dept. Imaging and Printing Technology, Faculty of Science, Chulalongkorn University)

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Paper