Red-emission phosphor’s brightness deterioration by x-ray and brightness recovery phenomenon by heating
Red-emission phosphor’s brightness deterioration by x-ray and brightness recovery phenomenon by heating
复制标题
红光荧光粉因X射线导致的亮度劣化和因加热而导致的亮度恢复现象
DOI：
10.1088/1361-6498/aa6272
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Zuguchi Masayuki
中科院分区：
文献类型：
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作者：
Nakamura Masaaki;Chida Koichi;Inaba Yohei;Kobayashi Ryota;Zuguchi Masayuki
介入放射学没有可行的实时和直接的皮肤剂量计。如果有X射线荧光粉没有由X射线照射引起的亮度变化，则可以使用X射线荧光粉，但是在我们先前的研究中研究的Y2 O3：Eu、（Y，Gd，Eu）BO 3和YVO 4：Eu荧光粉的发射被X射线照射降低。我们发现这些磷光体的亮度恢复，本研究的目的是研究它们的恢复现象。如果能阐明和防止X射线引起的亮度变化，则可以预期更多种类的磷光体可以用于X射线剂量计。用2戈伊X射线辐照Y2 O3：Eu、（Y，Gd，Eu）BO 3和YVO 4：Eu三种荧光粉，使其亮度降低。辐照后，研究了在室温和80 ℃下发生的亮度变化。辐照使所有磷光体的亮度降低5%-10%，但在室温和80 ℃下每种磷光体的亮度都立即恢复。在80 ℃下的恢复比在室温下快，并且在两个温度下恢复的亮度保持在X射线照射前亮度的95%-98%。Y2 O3：Eu、（Y，Gd，Eu）BO 3和YVO 4：Eu荧光粉在80 ℃下比室温下有更明显的亮度恢复现象。如果能阐明X射线引起荧光粉亮度变化的原因，将有更多种类的荧光粉可用于X射线闪烁剂量计。
There are no feasible real-time and direct skin dosimeters for interventional radiology. One would be available if there were x-ray phosphors that had no brightness change caused by x-ray irradiation, but the emission of the Y 2 O 3: Eu,(Y, Gd, Eu) BO 3, and YVO 4: Eu phosphors investigated in our previous study was reduced by x-ray irradiation. We found that the brightness of those phosphors recovered, and the purpose of this study is to investigate their recovery phenomena. It is expected that more kinds of phosphors could be used in x-ray dosimeters if the brightness changes caused by x-rays are elucidated and prevented. Three kinds of phosphors—Y 2 O 3: Eu,(Y, Gd, Eu) BO 3, and YVO 4: Eu—were irradiated by x-rays (2 Gy) to reduce their brightness. After the irradiation, brightness changes occurring at room temperature and at 80 C were investigated. The irradiation reduced the brightness of all the phosphors by 5%–10%, but the brightness of each recovered immediately both at room temperature and at 80 C. The recovery at 80 C was faster than that at room temperature, and at both temperatures the recovered brightness remained at 95%–98% of the brightness before the x-ray irradiation. The brightness recovery phenomena of Y 2 O 3: Eu,(Y, Gd, Eu) BO 3, and YVO 4: Eu phosphors occurring after brightness deterioration due to x-ray irradiation were found to be more significant at 80 C than at room temperature. More kinds of phosphors could be used in x-ray scintillation dosimeters if the reasons for the brightness changes caused by x-rays were elucidated.