卧位电子线全身照射的剂量分布

对Ｔ细胞淋巴瘤等广泛的皮肤病变患者采用仰卧和俯卧的电子线全身疗法。加速器光阑开到最大，不加限光筒。治疗时沿患者纵轴，３～４个野覆盖全长，机架对两种体位顺时针、逆时针４５°各照１次。用胶片法检测相邻野间的剂量均匀性，未见明显的剂量热点和冷点。用热释光剂量计等间隔地分布在人体模型６个不同体层上，６０个测试点结果表明全身剂量均匀性在±１０％以内。     

手表红宝石热释光剂量学某些特性的进一步研究

在改进的手表红宝石事故剂量测读装置上，对不同种类、不同型号的手表红宝石热释光剂量学特性，尤其是照射后衰退性做了进一步研究．对其热释光发光曲线有了新的认识．通过优化测量参数，选取３６０℃测量，剔除低温峰，减缓了照射后衰退速率，提高了剂量测量的准确度，使手表红宝石作为辐射事故剂量计使用更为可靠．     

心血管介入手术辐射防护设施与措施防护效果的监测与评价

目的：对心血管介入手术中操作者辐射剂量控制措施与设施防护效果进行监测与评价,获取对心血管介入手术辐射防护设计有意义的数据。方法：将热释光剂量计（TLD）元件分别放置于第一术者、第二术者和护理人员的铅衣内侧以及铅衣外侧,对铅衣屏蔽效果进行测量;通过在诊疗床上铅屏内侧以及外侧、床侧铅帘内侧以及外侧放置TLD元件,对其诊疗床铅屏、铅帘的防护效果进行测量。结果：第一术者与第二术者胸部铅衣外侧的剂量大于内侧,说明铅衣发挥了屏蔽散射X射线的作用。第一术者铅衣对射线的衰减率为91.1%,第二术者为88.6%。固定防护设施床上铅屏对射线的衰减率为96.0%,床侧铅帘对射线的衰减率为97.0%。结论：心血管介入手术现场的辐射防护措施与设施是有效的。     

Characterization of optically stimulated luminescence dosemeters to measure organ doses in diagnostic radiology

Objective

The aim of this study was to assess the characteristics of an optically stimulated luminescence dosemeter (OSLD) for use in diagnostic radiology and to apply the OSLD in measuring the organ doses by panoramic radiography.

Methods

The dose linearity, energy dependency and angular dependency of aluminium oxide-based OSLDs were examined using an X-ray generator to simulate various exposure settings in diagnostic radiology. The organ doses were then measured by inserting the dosemeters into an anthropomorphic phantom while using three panoramic machines.

Results

The dosemeters demonstrated consistent dose linearity (coefficient of variation<1.5%) and no significant energy dependency (coefficient of variation<1.5%) under the applied exposure conditions. They also exhibited negligible angular dependency (≤10%). The organ doses of the X-ray as a result of panoramic imaging by three machines were calculated using the dosemeters.

Conclusion

OSLDs can be utilized to measure the organ doses in diagnostic radiology. The availability of these dosemeters in strip form proves to be reliably advantageous.