2009
DOI: 10.1007/s10967-009-0244-y
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Degradation of 81 keV 133Xe gamma-rays into the 31 keV X-ray peak in CsI scintillators

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Cited by 7 publications
(7 citation statements)
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“…From Figure 8 , it is observed that the calculated band width of the CsI(Na) is 2.7 eV, which is consistent with the calculated results in Zhao Qiang’s work [ 6 ], and the band width of the CsI(Na) (010) surface is 2.99 eV, which decreased to 2.118 eV after the CsI(Na) (010) surface adsorbed H 2 O molecules. In other words, H 2 O molecular adsorption influences the band width and the electron density of state distribution, and that in turn affects the electron excitation process.…”
Section: Discussionsupporting
confidence: 86%
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“…From Figure 8 , it is observed that the calculated band width of the CsI(Na) is 2.7 eV, which is consistent with the calculated results in Zhao Qiang’s work [ 6 ], and the band width of the CsI(Na) (010) surface is 2.99 eV, which decreased to 2.118 eV after the CsI(Na) (010) surface adsorbed H 2 O molecules. In other words, H 2 O molecular adsorption influences the band width and the electron density of state distribution, and that in turn affects the electron excitation process.…”
Section: Discussionsupporting
confidence: 86%
“…In order to investigate the CsI(Na) crystal scintillation degradation caused by the crystal surface adsorbing H 2 O molecules, we exposed CsI(Na) crystal to 25% relative humidity air at 15 °C temperature and 85% relative humidity air with different exposure time. Figure 3 and Figure 4 show the CsI(Na) crystal samples that were exposed for different times; we can see that the CsI(Na) crystal surface becomes more blurred with a longer exposure period; these blurred layers on the crystal surface, called “dead ” or “inactive” layers [ 6 , 13 ] on the surface of deteriorated detectors, were indirectly illustrated by the decrease in the scintillation performance. We measured the γ ray-excited emission spectra of crystals using the experimental setup in Figure 2 to study the effect caused by the “dead” layer under 137 Cs-662 keV γ ray excitation.…”
Section: Discussionmentioning
confidence: 99%
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“…The energy deposition processes in the CsI(Na) detector, including a "dead" layer, have been experimentally demonstrated by direct observation of an additional X-ray decay peak isolated from the main photopeak that is supported by Monte Carlo simulation. [9] Readers who are interested in simulation results should refer to the original paper and references therein. These studies emphasize on the radioluminescence responses, but do not elucidate what is the "dead" layer, how the "dead" layer is developed, to what extend the "dead" layer can grow into the bulk crystal, and why the "dead" layer affects scintillation performance.…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, the nanoparticles of NaI are more hygroscopic in the air than other alkali halides. An anti-moisture process after the deposition process of CsI:Na film is necessary because the hygroscopic nanoparticles remarkably decrease the luminescence scintillation and generate cracks in the cylindrical structure [9,12,[22][23][24][25]. In previous studies, the protective SiO 2 , Al, and parylene-N layers subsequently deposited on the CsI or CsI:Na film in the same vacuum chamber was investigated, respectively [14][15][16][17]19].…”
Section: Introductionmentioning
confidence: 99%