Laboratories of The Rockefeller Institute for Medical Research.
J Exp Med. 1930 Oct 31;52(5):769-80. doi: 10.1084/jem.52.5.769.
X-ray beams of wave lengths lying in the range between 4 A and 0.5 A all kill B. coli in a semilogarithmically linear fashion. Interpreted in terms of the known quantized absorption of X-rays, this means that one absorption of any of these radiations is sufficient to kill. Though death results from a single absorption, only about one hit in four with Ag K and one in sixty with Ag L radiation is deadly. The course of curves constructed from these experimental results suggests that the portion of this bacterium which is essential to its continued life has a total of approximately 0.01 of the cell volume. For copper and harder radiations the biological action of the rays is proportional to their measured air ionization. The same biological change with the softer chromium K. and silver L X-rays seems to require a somewhat more intensely ionizing beam.
波长在 4A 至 0.5A 之间的 X 射线以半对数线性方式杀死 B. coli。根据已知的 X 射线量子吸收解释，这意味着这些辐射中的任何一种的单次吸收就足以杀死。尽管死亡是由单次吸收引起的，但只有大约四分之一的 Ag K 和六十分之一的 Ag L 辐射的命中是致命的。从这些实验结果构建的曲线表明，对细菌的持续生命至关重要的部分约占细胞体积的 0.01。对于铜和更硬的辐射，射线的生物作用与它们在空气中的电离成正比。对于较软的铬 K 和银 L X 射线，同样的生物变化似乎需要一个更强烈的电离束。
