在放射生物学中,关于DNA辐射损伤以及化学物质对这种损伤的防护作用机制的研究,历来是引人注目的课题。自从1959年有三位作者首次用ESR方法观察到γ射线或电子脉冲辐照的固态DNA中的自由基以来,至今绝大多数关于DNA辐射损伤及其化学防护作用的ESR研究,都是用固态或冷冻水溶液状态的样品进行的。这是因为所产生的自由基在 In radiobiology, studies on the protective effects of DNA radiation damage and chemicals on such damage have traditionally been a subject of considerable attention. Since the first time in 1959, three authors observed by ESR the free radical in solid-state DNA irradiated by gamma rays or electron pulses, most of the ESR studies on DNA radiation damage and its chemopreventive effect have so far been performed in solid state or Chilled aqueous solution of the sample. This is because of the free radicals that are generated