(b) 在低剂量和低剂量率情况下，电离辐射对免疫系统的影响既可能是抑制性的，也可能是刺激性的。有必要评估低辐射剂量对免疫功能产生的与人类健康有关的长期影响。
(b) At low doses and dose rates, the effects of ionizing radiation on the immune system may be suppressive or stimulatory. The long-term impacts of low radiation doses on the immune functions in relation to human health need to be evaluated.