The relative biological effectiveness of 0.2MeV neutrons to induce micronuclei in the root-tip cells of onion seedlings after irradiation as dry dormant seeds

ZHANG Wenyi; JIAO Ling; HOSHI Masaharu

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The relative biological effectiveness of 0.2MeV neutrons to induce micronuclei in the root-tip cells of onion seedlings after irradiation as dry dormant seeds

更新时间：2023-03-30

- The relative biological effectiveness of 0.2MeV neutrons to induce micronuclei in the root-tip cells of onion seedlings after irradiation as dry dormant seeds
- Journal of Radiation Research and Radiation Processing Vol. 22, Issue 6, Pages: 375-377(2004)
- 作者机构：
  
  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.广岛大学原爆放射线医科学研究所　日本　广岛　734−8553
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ZHANG Wenyi, JIAO Ling, HOSHI Masaharu. The relative biological effectiveness of 0.2MeV neutrons to induce micronuclei in the root-tip cells of onion seedlings after irradiation as dry dormant seeds. [J]. Journal of Radiation Research and Radiation Processing 22(6):375-377(2004)
DOI：

ZHANG Wenyi, JIAO Ling, HOSHI Masaharu. The relative biological effectiveness of 0.2MeV neutrons to induce micronuclei in the root-tip cells of onion seedlings after irradiation as dry dormant seeds. [J]. Journal of Radiation Research and Radiation Processing 22(6):375-377(2004) DOI：

摘要

为更好地了解单能中子照射的相对生物效应（Relative biological effectiveness，RBE），用加速器产生的0.2MeV单能中子以及,60,Co γ射线照射洋葱种子，观察单位剂量的两种辐射在根尖细胞中的微核诱发率的差异。0.2MeV中子单位剂量的微核诱发率为5.36±0.30 （%Gy,−1,）；,60,Co γ射线单位剂量的微核诱发率为0.031±0.002 （%Gy,−1,）。0.2MeV单能中子照射洋葱种子后在根尖细胞诱发微核的RBE值高达173±15，其中一个十分重要的因素就是，中子照射所致的DNA损伤的修复效率可能不同于由γ射线照射所致的DNA损伤的修复效率。

Abstract

Dry dormant onion seeds were irradiated by 0.2MeV neutrons from an accelerator, or ,60,Co γ-rays, for a better understanding of relative biological effectiveness (RBE) of mono-energy neutrons, and for observing different frequencies of micronuclei in root-tip cells of the onion seedlings induced by unit dose of the neutrons and γ-rays. The frequencies of micronuclei induced by unit dose of the 0.2MeV neutrons and the ,60,Co γ-rays are 5.36±0.30 and 0.031±0.002 (%Gy,-1,), respectively. The RBE value for the 0.2MeV neutrons is about 173±15, using the ,60,Co γ-rays as reference radiation. The RBE value of the 0.2MeV neutrons to induce micronuclei in the root-tip cells of ,Allium cepa, onion seedlings irradiated as dry dormant seeds is as high as 173±15. Our findings suggested that the repair efficiency of DNA damage induced by mono-energetic neutrons might be different from those by γ-rays.

关键词

中子微核洋葱种子相对生物效应

Keywords

NeutronMicronucleusOnion seedRelative biological effectiveness (RBE)

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