Units of irradiation
The amount of radiation energy that is absorbed by food as it moves through the radiation field during processing is known as the radiation dose.
“Low” dosages, less than 1 kGy
- Eliminate pests from grains and fruits.
- Prevent tubers from sprouting.
- Postpone the ripening of some fruits and vegetables.
- Eliminate parasites from animal products (such asTrichinella spiralisin pork).
“Medium” dosages between 1 and 10 kGy
- EliminateE. coli,Salmonella, Shigella, Campylobacter, Yersinia, Listeria, and other pathogens from meat, poultry, and seafood.
- Stop the development of mouldon strawberries and other foods.
Higher than 10 kGy “high” dosages
- Kill pests and microbes on spices.
- Commercial sterilisationof food eliminates potentially harmful bacteria. The high dose finds its application inspecial diets for those with compromised immune systems [2].
Food Irradiation Procedure
- Ionising radiation is applied to the meal through gamma rays, a high-energy electron beam, or potent X-rays.
- X-rays and gamma rays are two types of radiation that resemble microwaves in some ways but have significantly greater energy and penetration.
- Like microwaves in a microwave oven, the rays travel through the meal, but the food does not significantly heat up. Food is not radioactive unless it has been exposed to gamma rays. Electricity, which can be turned on or off, creates electron beams and x-rays; radioactive material is unnecessary.
- In both situations, it is possible to eliminate the organisms that cause food to spoil, including insects, mould, and bacteria, some of which are significant sources of food poisoning [3].
Figure 1: Food products are sent to an irradiation chamber where a beam is passed through them [4]
Benefits of food irradiation
This method of food processing has several advantages, such as:
- Increased shelf life for some products;
- Decreased food spoilage;
- Decreased risk of food-borne illnesses like Campylobacter, Salmonella, E. coli, and Listeria (especially in meat, poultry, and fish);
- Less need for pesticides;
- Less need for some additives, like preservatives and antioxidants;
- Lower risk of importing or exporting insect pests concealed inside food products;
- Reduced need for pesticides.