• RADIATION TECHNOLOGY APPLICATION •

### Optimization of 60Co γ irradiation process for food

LAN Bifeng1,ZHANG Suping1(),TANG Zhihong2,CAI Jiejin2,LUO Pengyu1,LIANG Shumin1

1. 1.Guangzhou Furui High Energy Technology Co. , Ltd, Guangzhou 511458, China
2.School of Electric Power, South China University of Technology, Guangzhou 510641, China
• Received:2019-11-28 Revised:2020-01-16 Accepted:2020-01-16 Online:2020-06-20 Published:2020-06-18
• Contact: ZHANG Suping E-mail:2969312179@qq.com
• About author:LAN Bifeng (male) was born in September 1977, and obtained his master’s degree from South China University of Technology in 2018, engaging in the research, development and project management of food, biological drugs and irradiation products

Abstract:

This study aims at improving the irradiation processing capability of the 60Co γ-radiation source and ensuring the quality of irradiated food. Thus, different stacking thicknesses and irradiation box structures were selected as process parameters, and the absorbed dose and unevenness of irradiated foods with different densities were measured and analyzed. The results showed that the spatial dose field distribution was symmetric with the center point of the source plate, symmetrically distributed above and below the center, and that the absorbed dose at the center was the highest. With increasing distance from the center, the absorbed dose decreased, and unevenness was observed. The greater the stacking thicknesses of products with the same density, the higher was the unevenness. There was no obvious effect of stacking thickness on low-density products. Combined with the dose distribution of the empty field, when the unevenness was greater than 1.4, the main contradiction was transformed into the influence of stacking thickness, mainly because of the inhomogeneity of the outer and central surfaces. At this time, in order to increase the utilization rate of γ-rays, the minimum dose and loading amount should be determined for the product with a density of less than 0.36 g/cm3, consider thinning instead of tiling for the product with a density of more than 0.36 g/cm3. For products with a density of 0.3 g/cm3, the spatial distribution of the irradiation field at a height of 5 cm from the bottom of the irradiation box was better than that of the punch. In addition, the γ-ray utilization of the irradiation box height and punch increased by 8.26% and 8.30%, respectively, compared with those for the original irradiation box. Therefore, the loading capacity and the structure of the irradiation box can be considered to reduce the minimum absorbed dose of food, thereby improving the energy utilization rate and production efficiency of γ-rays during food irradiation.

CLC Number:

• TL99