Radioactivity provides an extremely sensitive method of analysis since disintegration of individual nuclei are monitored . 因此放射现象可以监视每一个核的裂变，因此放射现象提供了一个极灵敏的分析方法。
2.
Their outside individual nucleus cell is in week blood the leucocyte interferon that small amount produces only after virus is atttacked 他们的外周血单个核细胞在病毒攻击后仅产生低量的白细胞干扰素。
