sentences:  Food irradiation is currently permitted by over 40 countries and volumes are estimated to exceed annually worldwide.Food irradiation is essentially a non-nuclear technology; it relies on the use of ionizing radiation which may be generated by accelerators for electrons and conversion into bremsstrahlung, but which may use also gamma-rays from nuclear decay.There is a worldwide industry for processing by ionizing radiation, the majority by number and by processing power using accelerators.