positron electron annihilation 中文意思是什麼
positron electron annihilation
解釋
偶湮沒- positron : n. 【物理學】正子，陽電子，正電子。
- electron : n. 【物理學】電子。 the electron beam 電子束。 the electron theory 電子（學）說。
- annihilation : n. 1. 絕滅，消滅，殲滅。2. 【物理學】湮滅。3. 【神學】靈魂與肉體的毀滅。n. -ism 【宗教】靈魂寂滅論〈認為作惡者死後靈魂必歸毀滅〉。
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The basic idea of positron imaging is injected chemical compounds labeled with positron - emitting nuclides into a body, then the distribution of the nuclides from the annihilation of positron and electron can be measured
可見，正電子成像系統的相關研究可由兩部分組成：成像裝置的研究、圖像重建的研究。本論文正是針對這兩個方面。 -
In czochralski silicon crystals ( czsi ) through fast neutron irradiation, formation and conversion of defects were investigated using fourier transform infrared spectroscopy ( ftir ), positron annihilation technology ( pat ) and scanning electron microscope ( sem ). the results showed that fast neutron irradiation induced large quantity of metastable defects which can be the capture centers of positron, positron annihilation average lifetime of samples increased with increasing of irradiation dosage. positron annihilation average lifetime of irradiation samples through dosage up to 1 1018 n. cm - 2 tended to constant
本文對直拉硅樣品進行了不同劑量的快中子輻照，在硅中引入大量的亞穩態缺陷，研究這些亞穩態缺陷的形成，並在較寬的溫度范圍內對輻照樣品進行了退火處理，研究退火后亞穩態缺陷的轉化及同硅中氧的相互作用，應用傅立葉變換紅外光譜技術（ ftir ） 、正電子湮沒技術（ pat ）和掃描電鏡（ sem ）進行了測試。
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