X-ray induced Sm3+ to Sm2+ conversion in fluorophosphate and fluoroaluminate glasses for the monitoring of high-doses in microbeam radiation therapy
X-ray induced Sm3+ to Sm2+ conversion in fluorophosphate and fluoroaluminate glasses for the monitoring of high-doses in microbeam radiation therapy
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X 射线诱导氟磷酸盐和氟铝酸盐玻璃中 Sm3 到 Sm2 的转化，用于监测微束放射治疗中的高剂量
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发表时间：
2012
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影响因子：
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通讯作者：
S. Kasap
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作者：
S. Vahedi;G. Okada;B. Morrell;Edward Muzar;C. Koughia;A. Edgar;C. Varoy;G. Belev;T. Wysokinski;D. Chapman;S. Kasap
加拿大光源利用三价Sm3+到二价Sm2+的转换，评价了掺有三价Sm的氟磷酸盐和掺入三价Sm的氟铝酸盐玻璃作为微束辐射治疗的X射线传感器。这两种类型的玻璃表现出相似的转换率，可用作线性传感器，最高可达∼150 Gy.可用作非线性传感器，最高可达∼2400 Gy.用多缝准直器进行的实验表明，转换图案的空间分辨率很高；该图案是通过共聚焦荧光显微镜技术获得的。在超过玻璃化转变温度Tg的温度下进行热处理，可以消除先前X射线照射的影响，而在TA <； Tg中进行热处理可以提高Sm的转化率。这种增强是由于X射线诱导的Sm~(2+)离子周围宿主玻璃离子基质的热刺激弛豫所致。此外，一些掺Sm~(3+)的玻璃还与Eu~(2+)离子共掺，但结果表明，掺Sm~(3+)的玻璃没有明显的掺杂现象.
Fluorophosphate and fluoroaluminate glasses doped with trivalent samarium were evaluated as sensors of x-ray radiation for microbeam radiation therapy at the Canadian Light Source using the conversion of trivalent Sm3+ to the divalent form Sm2+. Both types of glasses show similar conversion rates and may be used as a linear sensor up to ∼150 Gy and as a nonlinear sensor up to ∼2400 Gy, where saturation is reached. Experiments with a multi-slit collimator show high spatial resolution of the conversion pattern; the pattern was acquired by a confocal fluorescence microscopy technique. The effects of previous x-ray exposure may be erased by annealing at temperatures exceeding the glass transition temperature Tg while annealing at TA < Tg enhances the Sm conversion. This enhancement is explained by a thermally stimulated relaxation of host glass ionic matrix surrounding x-ray induced Sm2+ ions. In addition, some of the Sm3+-doped glasses were codoped with Eu2+-ions but the results show that there is no marked ...