“photon activation analysis”的概念、定义、翻译、参考文献-科学参考

单词	photon activation analysis
释义	photon activation analysis Encyclopedia 理学核分析技术释 photon activation analysis光子活化分析高能γ光子轰击靶核引起光核反应生成放射性核素，通过测量生成核放出的特征γ射线或X射线的能谱，以实现元素定性和定量分析的活化分析方法。 Chemistry ＞放射化学与辐射化学＞放射分析化学＞释义 photon activation analysis (PAA)光子活化分析
随便看	positive definite Hermitian matrix positive definite inner product axiom positive definite kernel positive definite matrix positive definiteness positive definite operator positive definite potential positive definite product positive definite quadratic form positive definite scalar product positive definite sequence positive definite solution positive definite space positive definite tensor positive definte rational fanction positive deviation positive diffeomorphism positive diffeomorphisms positive differential positive direction positive displacement compressor positive displacement flowmeter positive displacement motor drill positive displacement pump positive displacement sensor

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