Some micro-organisms produce substances which cause food to deteriorate. These substances are not readily destroyed by irradiation and some of them are very hazardous to health (e.g. the toxin which causes botulism).

• 一些微生物会产生一些使食物变质的物质,这些物质不易被辐照所杀灭,其中的一些甚至对健康非常有害(如：可引起腊肠毒素病的毒素)