Rao D V, Narra V R, Howell R W, Govelitz G F, Sastry K S
Department of Radiology, University of Medicine and Dentistry of New Jersey, Newark.
Lancet. 1989 Sep 16;2(8664):650-3. doi: 10.1016/s0140-6736(89)90896-9.
When the atomic nucleus of 125I decays by orbital electron capture followed by internal conversion, numerous very-low-energy electrons (Auger electrons) are emitted, so that the energy density in the immediate vicinity of the decay site is extremely high. 125I incorporated into DNA was as effective as densely ionising 5.3 MeV alpha-particles from 210Po in reducing the sperm-head population in mice. Hence the biological risks of Auger-electron emitting radionuclides widely used in biology and medicine ought to be reassessed.
当¹²⁵I的原子核通过轨道电子俘获随后进行内转换衰变时,会发射出大量极低能量的电子(俄歇电子),从而使衰变部位紧邻区域的能量密度极高。掺入DNA中的¹²⁵I在减少小鼠精子头部数量方面,与来自²¹⁰Po的密集电离5.3 MeVα粒子一样有效。因此,广泛应用于生物学和医学的发射俄歇电子的放射性核素的生物风险应该重新评估。