萃取反萃取
Extraction and back extraction
extraction-anti-extraction
反符合运算
anticoincidence operation
反符合选择单元
anticoincidence selector unit
反符合屏蔽锗γ射线能谱仪
anti-coincidence-shielded Ge gamma-ray spectrometer
反符合屏蔽γ谱仪
Anticoincidence shielded gamma ray spectrometer