发现释放和实际利用原子核能的方法是现代科学的巨大成就.自从发现天然放射性同位素和人工方法得到大量的各种放射性同位素以来,利用这些同位素作为“标记原子”可以建立很精细而准确的方法——示踪原子法.用此法来研究生命体内代谢物质的吸收排泄,循环分布,渗透转移及更新和周转,揭开了许多“自然之谜”,有力地推动了科学的发展.放射性同位素的射线,与可见光一样,能使核子乳胶感光.在暗处,把放射性样品放在核子乳胶上,一定时间的曝光产生潜象,再经显影就可把象显出来.凡是射线在核子乳胶起作用的地方,就显现出黑点.射线强,黑度大;射线弱,黑度小.这种利用核子乳胶记录,检查和测量标本(整体或组织的)或样品(细胞或亚细胞水平)中的放射性物 Discovering ways to release and actually use nuclear energy is a great achievement of modern science. Since the discovery of natural radioisotopes and artificial methods to obtain a large number of various radioactive isotopes, the use of these isotopes as “marker atoms” can create very precise and accurate methods— - Tracer atom method. Using this method to study the absorption and excretion of metabolic substances in life, circulation distribution, infiltration transfer and renewal and turnover, opened a lot of “natural mysteries”, and effectively promoted the development of science. Radioisotope Rays, like visible light, can make the nucleus latex sensitive. In the dark, the radioactive sample is placed on nuclear latex. Exposure for a certain period of time produces a latent image, which can then be visualized by developing it. All rays act in nuclear latex. The spots appear black spots. The rays are strong, the darkness is large; the rays are weak and the darkness is small. This kind of recording using nuclear latex, examination and measurement of specimens (whole or tissue) or samples (cell or subcellular level) Radioactive material