Radioactivity

1.

(1. Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction. 2. The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance) វិទ្យុសកម្មភាព

2.

(វេជ្ជសាស្ត្រ) កាំរស្មីសកម្មភាព, ការបញ្ចេញកាំរស្មី, ថាមពលកាំរស្មី