A Dosimetry Study of Portable X-ray Fluorescence in Vivo Metal Measurements
A Dosimetry Study of Portable X-ray Fluorescence in Vivo Metal Measurements
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DOI：
10.1097/hp.0000000000000971
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发表时间：
2019-05-01
期刊：
影响因子：
2.2
通讯作者：
Nie, Linda H.
中科院分区：
文献类型：
--
作者：
Specht, Aaron J.;Zhang, Xinxin;Nie, Linda H.
便携式x射线荧光装置越来越受欢迎，可用于对骨骼和脚趾甲进行体内测量的金属暴露评估。这些测量伴随着很小的辐射剂量，通常被辐射安全委员会评估为最小。然而，对不同仪器条件下的精确剂量的了解仍然是必要的。本研究利用光激发剂量计、热释光剂量计和蒙特卡洛n粒子传输码模拟，对便携式x射线荧光装置的典型皮肤和全身有效剂量进行了全面的研究。测量时间、x射线管电流和辐射剂量与器件呈正态线性关系，与电压和辐射剂量呈二阶多项式关系。使用热释光剂量计、光刺激剂量计和模拟来量化剂量，它们给出了相似的剂量估计。模拟结果显示，在50-kV、40亩a标准测量条件下，人体骨骼和趾甲的皮肤剂量分别为48.5和28.7毫西弗。使用便携式x射线荧光仪测量成人体内骨骼和脚趾甲的总有效剂量分别为3.4和2.0 μ Sv。
Portable x-ray fluorescence devices have grown in popularity for possible metal exposure assessment using in vivo measurements of bone and toenail. These measurements are accompanied by a small radiation dose, which is typically assessed by radiation safety committees to be minimal. However, an understanding of precise dose under different instrument conditions is still needed. This study set out to do a thorough investigation of the exact dose measurements using optically stimulated dosimeters, thermoluminescent dosimeters, and simulation with a Monte Carlo N-Particle transport code to assess the skin and total-body effective dose typical of portable x-ray fluorescence devices. We showed normal linear relationships between measurement time, x-ray tube current, and radiation dose with the device, and we showed a second order polynomial relationship with increasing voltage and radiation dose. Dose was quantified using thermoluminescent dosimeters, optically stimulated dosimeters, and simulations, which gave similar dose estimations. Skin dose for a standard 50-kV, 40-mu A measurement for bone and toenail in vivo was 48.5 and 28.7 mSv, respectively, according to simulation results. Total-body effective dose was shown as 3.4 and 2.0 mu Sv for in vivo bone and toenail measurements, respectively, for adults using the portable x-ray fluorescence device.