用于探測(cè)能量為0.110keV光子的夾心結(jié)構(gòu)CsI光陰極
THE SANDWICH Csl PHOTOCATHODES FOR PHOTON DETECTING IN THE 0.1-10keV REGION
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摘要: 為了穩(wěn)定而有效地探測(cè)能量范圍在0.110keV之間的軟X射線,研制并優(yōu)化了一種高低密度夾心結(jié)構(gòu)的透射式CsI光陰極。它的光子探測(cè)效串大約是高密度透射式CsI光陰極的110倍。所測(cè)得的光電發(fā)射次級(jí)電子能量分布曲線與高密度CsI光陰極類似,半極限值的全寬度(FWHM)不到2eV。由于它的量子效率高而次級(jí)電子能量分布范圍相當(dāng)窄,這種夾心結(jié)構(gòu)透射式CsI光陰極廣泛地應(yīng)用于軟X射線探測(cè)器和計(jì)數(shù)器,特別是軟X射線條紋攝相管。
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關(guān)鍵詞:
Abstract: The high and low density sandwich CsI photocathodes have been developed and optimized to yield relatively stable and effecient systems for photon detecting in the 0.1-10 keV region. For sandwich CsI photocathodes, the photon detecting effeciency is 2-10 times higher than that oh-tained with the high density Csl photocathodes in the 0.1-10 keV region. The energy distributions of the photoemitted secondary electrons have been measured to be similar for the high density sandwich photocathodes and with about 2eV full-width-half-maximum. The high efficiencies and relatively narrow emitted electron energy distributions have made the CsI transmission photocathodes extensively useful in soft x-ray detectors and counters especially is x-ray streak camera applications. -
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