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الثلاثاء، 5 أغسطس، 2014

Conceptual Design of Cobalt-60 Food Irradiation

Author        : Adama Yoro Sidibe
Degree        : M.Sc Nuclear
Title            : Conceptual Design of Cobalt-60 Food Irradiation
 :Abstract
This thesis deals with irradiation technologies and their various applications in food processing for better benefits in terms of food preservation, trade and safety. Design parameters and calculations of Co-60 irradiation facility are described for potential utilization in Mali to reduce post-agricultural losses in some products.
The irradiation technologies presented are gamma radiation, electron beam and X-rays irradiators, their categorization and some of their advantages and design features.
The applications described comprise high-dose applications such sterilization of food (meat, seafood), treatment of dry spices; and low-dose applications such radurization (use of radiation to extend product life by reducing the microbial population, delay ripening, etc.), radicidation (use of radiation to eliminate some pathogenic bacteria in non-sterilized food), insect disinfestation, etc.). Indeed to accomplish a specific treatment a required dose values must be applied and adequate dosimeters and dosimetry systems are to be selected.
The design part of the thesis focuses on the determination of the source intensity of a category IV type of Co-60 facility to be potentially used to treat agricultural products in Mali such mango, potato, tomato, etc. Much of this part deals with shielding calculations of the radiatin source (water storage) and concrete shielding of radiation room (biological shield) using Monte Carlo Neutral Particle code (MCNP). The results of these calculations are discussed in detail.
Finally, some additional information is provided with regard to measures of radiation protection safety and security of radiation sources to meet the requirements of international/national standards and regulations.





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