radioactivity

n.

放射（性）；辐射能；

1. Radioactivity is a special quality of radium.
   放射性是镭的一种特性。
2. The soil contains 30 times the acceptable level of radioactivity.
   这片土壤受到了高于标准30 倍的辐射。

Air chemistry and radioactivity
Air Chemistry And Radioactivity
Air chemistry and radioactivity
Atmospheric Composition. (Book Reviews: Air Chemistry and Radioactivity)
Stratospheric-tropospheric exchange based on radioactivity, ozone and potential vorticity
Fluorographic detection of radioactivity in polyacrylamide gels with the water-soluble fluor, sodium salicylate.
The Preparation of 131I-Labeled Human Growth Hormone of High Specific Radioactivity
THE PREPARATION OF 131I-LABELLED HUMAN GROWTH HORMONE OF HIGH SPECIFIC RADIOACTIVITY
THE PREPARATION OF I-131-LABELLED HUMAN GROWTH HORMONE OF HIGH SPECIFIC RADIOACTIVITY
THE PREPARATION OF ¹³¹I-LABELED HUMAN GROWTH HORMONE OF HIGH SPECIFIC RADIOACTIVITY