0.8 MeV单能中子照射洋葱萌发种子后在根尖细胞中诱发微核的相对生物效能  

RELATIVE BIOLOGICAL EFFECTIVENESS OF INDUCED MICRONUCLEI IN ROOT-TIP CELLS OF ONION SEEDLINGS IRRADIATED WITH 0.8 MeV NEUTRONS

作　　者：张文艺[1] 焦玲[1] 星正治[2] 

机构地区：[1]中国医学科学院中国协和医科大学放射医学研究所,天津300192 [2]日本广岛大学原爆放射线医科学研究所

出　　处：《辐射防护》2006年第3期162-165,共4页Radiation Protection

摘　　要：通过由加速器产生的0.8 MeV单能中子和60Coγ射线照射洋葱萌发种子,观察在根尖细胞中微核诱发率,从而更好地了解中子相对生物效能(RBE)。洋葱萌发种子照射单位剂量0.8 MeV单能中子和60Coγ射线后,根尖细胞中的微核诱发率分别为111±6.7(10-2Gy-1)和3.59±0.19(10-2Gy-1)。因此,以60Coγ射线为参考辐射时,0.8 MeV单能中子在洋葱根尖细胞诱发微核的相对生物效能(RBE)值为31.0±2.5。与252Cf裂变中子的RBE比较,0.8 MeV单能中子照射在洋葱根尖细胞中诱发微核的RBE值要高。For a better understanding of the relative biological effectiveness （RBE） of mono-energetie neutrons, the frequencies of micronuclei induced in the root-tip cells of onion seedlings were observed after irradiation with 0.8 MeV mono-energetic neutrons from an accelerator and γ-rays from a ^60Co souwe. The frequencies of micronuclei induced by unit dose of 0.8 MeV mono-energetic neutrons mentioned above and γ- rays from a ^60Co source were 111 ± 6.7 （ 10^- 2 Gy^- 1 ） and 3.59 ± 0. 19 （ 10^- 2 Gy^- 1 ）, respectively. Accordingly, when ^60Co γ-ray radiation was used as a reference radiation, the RBE value for 0.8 MeV monoenergetic neutrons to induce micrenuclei in the root-tip cells of onion seedlings was about 31.0 ± 2.5, which is higher than that of ^252Cf fission neutrons.

关 键 词：单能中子 微核 洋葱萌发种子 相对生物效能 

分 类 号：Q947[生物学—植物学]