Anuradha Prakash and José de Jesús Ornelas-Paz
"Radiation is any energy traveling through the space in form of waves or particles. It can be classified as ionizing and nonionizing, depending on its energy. Ionizing energy has shorter wavelengths yet higher frequency and energy as compared to nonionizing energy... The term 'food irradiation' refers to the deliberate exposure of food to ionizing radiation."