不是。用射線照過，有助於長期保存

https://baike.baidu.com/item/輻射保鮮

https://www.fda.gov/food/buy-store-serve-safe-food/food-irradiation-what-you-need-know

“The FDA has evaluated the safety of irradiated food for more than 30 years and has found the process to be safe. The World Health Organization (WHO), the Centers for Disease Control and Prevention (CDC) and the U.S. Department of Agriculture (USDA) have also endorsed the safety of irradiated food.”