Evaluation of a Fluorochlorozirconate Glass‐Ceramic Storage Phosphor Plate for Gamma‐Ray Computed Radiography
Evaluation of a Fluorochlorozirconate Glass‐Ceramic Storage Phosphor Plate for Gamma‐Ray Computed Radiography
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DOI：
10.1111/jace.13664
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发表时间：
2015-08
影响因子：
3.9
通讯作者：
R. Leonard;S. Gray;Carlos Alvarez;A. Moses;L. Arrowood;A. Lubinsky;A. Petford-Long;J. Johnson
中科院分区：
文献类型：
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作者：
R. Leonard;S. Gray;Carlos Alvarez;A. Moses;L. Arrowood;A. Lubinsky;A. Petford-Long;J. Johnson
一种含有掺杂二价铕的正交氯化钡晶体的氟氯锆酸盐（FCZ）玻璃陶瓷被评价为在伽马射线成像中用作存储荧光粉。玻璃陶瓷样品的x射线衍射和磷光测定表明，在玻璃基体中存在大量的正交氯化钡晶体。利用透射电镜和扫描电镜对晶体的大小、结构和形貌进行鉴定。在FCZ玻璃基体中，正交氯化钡晶体的尺寸非常大，约为0.5 ~ 0.7 μm，这限制了图像的分辨率。将FCZ玻璃陶瓷样品暴露在1 MeV伽马射线下，以确定其在高能量下的光激发射特性，发现其适合成像应用。测试图像是在2 MeV的能量下使用间隙和阶跃楔形模。利用样品成像板对440不锈钢模体小至101.6 μm的间隙进行成像。利用贫铀阶跃楔形模体产生的图像分析表明，发射与入射能量和估计吸收剂量成正比。结果表明，样品成像板具有应用于伽马射线计算机成像和剂量学的潜力。
A fluorochlorozirconate (FCZ) glass-ceramic containing orthorhombic barium chloride crystals doped with divalent europium was evaluated for use as a storage phosphor in gamma-ray imaging. X-ray diffraction and phosphorimetry of the glass-ceramic sample showed the presence of a significant amount of orthorhombic barium chloride crystals in the glass matrix. Transmission electron microscopy and scanning electron microscopy were used to identify crystal size, structure, and morphology. The size of the orthorhombic barium chloride crystals in the FCZ glass matrix was very large, ~0.5–0.7 μm, which can limit image resolution. The FCZ glass-ceramic sample was exposed to 1 MeV gamma rays to determine its photostimulated emission characteristics at high energies, which were found to be suitable for imaging applications. Test images were made at 2 MeV energies using gap and step wedge phantoms. Gaps as small as 101.6 μm in a 440 stainless steel phantom were imaged using the sample imaging plate. Analysis of an image created using a depleted uranium step wedge phantom showed that emission is proportional to incident energy at the sample and the estimated absorbed dose. The results showed that the sample imaging plate has potential for gamma-ray-computed radiography and dosimetry applications.