Investigation of the usability of radiochromic films for determination of dose uniformity of food surface in UV-c treatment için kapak resmi
Investigation of the usability of radiochromic films for determination of dose uniformity of food surface in UV-c treatment
Başlık:
Investigation of the usability of radiochromic films for determination of dose uniformity of food surface in UV-c treatment
Yazar:
Seyfi, Yadigar, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
ix, 102 leaves: color illustraltions, charts;+ 1 computer laser optical disc.
Özet:
The microbial inactivation efficiency of UV light is dependent on product shape and surface morphology on non-planar food surfaces. Since every point of the product is not exposed to the same level of UV light, the efficiency decreases. In addition, during UV light illumination, blind spots may occur, and sufficient inactivation cannot be achieved. So, it is essential to determine UV fluence (dose) applied to surfaces. Actinometry, biodosimetry and mathematical techniques are used to evaluate UV fluence on solid surfaces and in liquid foods. In this study, use of radiochromic films (RCFs) integrated with a computer vision system (CVS) based on image analysis is proposed as an alternative method to evaluate UV fluence on food surfaces. For this purpose, the color change of RCFs on non-planar surfaces exposed to different UV intensity and exposure time was correlated with UV fluence. The results were compared with actinometric and radiometric measurement techniques. Experimental results have been tested and verified on real food surfaces such as apples. It was revealed that there is a linear correlation between the color change of RCF and UV fluence. The maximum UV fluence that could be determined using RCF at 254 nm was approximately 60 mJ/cm2. It was found that films were stable up to 15 days at room and refrigerated conditions. The shape of the apples resulted in different UV fluence distribution profiles on the surface. As a result, it has been demonstrated that RCFs can be successfully used to determine UV fluence on sample surfaces.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology:Food Engineering.

İzmir Institute of Technology: Food Engineering --Thesis (Master).
Elektronik Erişim:
Access to Electronic Versiyon.
Ayırtma: Copies: