39. 虽然在高剂量电离辐射的抑制性影响方面有着翔实的记录，但 2006 年报告附件 D 认为，低剂量辐射对免疫系统的影响尚不确定；对刺激性影响和抑制性影响均有过报告。
39. While the suppressive effects of high doses of ionizing radiation are well documented, annex D to the 2006 report concludes that uncertainty exists regarding effects of low radiation doses on the immune system; both stimulatory and suppressive effects have been reported.