Get it in the refrigerator quickly. As for your lunch, use an insulated lunch box and a coldpack. Improper cooling is the number one reported cause of food-borne illness in the United States. Irradiation is the practice of exposing food products to a radiation source in order to kill bacteria, parasites, insects, etc. The FDA approved the use of irradiation to reduce the occurrence of disease-causing microorganisms in red meat, poultry, fruits and vegetables, and spices.
Irradiation is a controversial practice.
Sometimes even the obvious solutions can be misleading. You are better off cleaning kitchen and bathroom surfaces with disinfectants. It could easily harbor millions of bacteria and viruses. Use germ-resistant sponges, or allow sponges to dry between uses. You can also microwave your sponges or clean them with chlorine bleach.