壊かい変へん毎まい分ふん

noun

disintegration per minute; dpm

Technical term in physics for the number of radioactive decays occurring in one minute.

• この試し料りょうの放ほう射しゃ能のうは約やく500壊かい変へん毎まい分ふんです。

  The radioactivity of this sample is about 500 disintegrations per minute.