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目的 为建立诊断水平X射线计量标准,测量获得RQR 系列标准辐射质量,以实现诊断X射线设备辐射剂量的量传与溯源,确保医学诊断的安全有效以及量值测定的准确可靠。方法 本文采用医用诊断光机作为X射线辐照装置,搭建了辐射测量系统,研究设计并加工了半值层试验器件用于空气比释动能的测量。利用计算机编程的方法,绘制空气比释动能随过滤片厚度衰减变化的曲线,最终得到与RQR标准辐射质量相一致的附加过滤厚度条件。结果 建立的9个辐射质,当辐射束中放置和不放置半值层试验器件时测得的空气比释动能比值均处于0.485~0.515,同质系数与规范推荐值之差在±0.03以内。结论 基于计算机编程,高效完成测量结果的插值拟合,成功建立与YY/T 0481—2016规范条件相一致的RQR系列辐射质,为建立诊断水平X射线计量标准奠定基础。
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田晓,工程师,研究方向为衡器化学。
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| 辐射质 | 测量结果 |
| RQR2${40}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 1.898 | 1.443 | 1.101 | 0.687 | 0.328 | 0.180 | 0.108 | 0.071 |
| RQR3${50}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 3.248 | 2.578 | 2.070 | 1.421 | 0.786 | 0.488 | 0.325 | 0.228 |
| RQR4${60}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 4.674 | 3.828 | 3.159 | 2.275 | 1.384 | 0.923 | 0.653 | 0.483 |
| RQR5${70}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 5.827 | 5.087 | 4.308 | 3.216 | 2.068 | 1.457 | 1.074 | 0.821 |
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空气比释动能测量结果(RQR2~RQR5), figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 测量结果 |
| RQR2${40}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 1.898 | 1.443 | 1.101 | 0.687 | 0.328 | 0.180 | 0.108 | 0.071 |
| RQR3${50}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 3.248 | 2.578 | 2.070 | 1.421 | 0.786 | 0.488 | 0.325 | 0.228 |
| RQR4${60}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 4.674 | 3.828 | 3.159 | 2.275 | 1.384 | 0.923 | 0.653 | 0.483 |
| RQR5${70}\mathrm{{kV}},{400}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 5.887 | 7.847 | 9.820 |
| 空气比释动能 /mGy | 5.827 | 5.087 | 4.308 | 3.216 | 2.068 | 1.457 | 1.074 | 0.821 |
), ArticleFig(id=1154354080873960134, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 测量结果 |
| RQR6${80}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 3.896 | 3.293 | 2.816 | 2.158 | 1.450 | 0.799 | 0.506 | 0.345 |
| RQR7${90}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 4.712 | 4.044 | 3.501 | 2.744 | 1.910 | 1.118 | 0.735 | 0.516 |
| RQR8${100}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 5.459 | 4.803 | 4.221 | 3.374 | 2.415 | 1.480 | 1.003 | 0.720 |
| RQR9${120}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 6.045 | 5.934 | 5.599 | 4.733 | 3.555 | 2.314 | 1.651 | 1.230 |
| RQR10${150}\mathrm{{kV}},{100}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 5.179 | 4.690 | 4.266 | 3.628 | 2.840 | 1.968 | 1.463 | 1.123 |
), ArticleFig(id=1154354080932680391, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=CN, label=表 2, caption=
空气比释动能测量结果(RQR6~RQR10), figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 测量结果 |
| RQR6${80}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 3.896 | 3.293 | 2.816 | 2.158 | 1.450 | 0.799 | 0.506 | 0.345 |
| RQR7${90}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 4.712 | 4.044 | 3.501 | 2.744 | 1.910 | 1.118 | 0.735 | 0.516 |
| RQR8${100}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 5.459 | 4.803 | 4.221 | 3.374 | 2.415 | 1.480 | 1.003 | 0.720 |
| RQR9${120}\mathrm{{kV}},{200}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 6.045 | 5.934 | 5.599 | 4.733 | 3.555 | 2.314 | 1.651 | 1.230 |
| RQR10${150}\mathrm{{kV}},{100}\mathrm{\;{mA}},{200}\mathrm{\;{ms}}$ | Al 衰减片厚度 /mm | 0.000 | 0.458 | 0.946 | 1.958 | 3.919 | 7.847 | 11.785 | 15.726 |
| 空气比释动能 /mGy | 5.179 | 4.690 | 4.266 | 3.628 | 2.840 | 1.968 | 1.463 | 1.123 |
), ArticleFig(id=1154354080999789256, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 附加过滤厚度 /mm | 第一半值层 /mm | 同质系数 实测值 | 同质系数 推荐值 |
| RQR2 | 0.37 | 1.42 | 0.81 | 0.81 |
| RQR3 | 0.24 | 1.78 | 0.76 | 0.76 |
| RQR4 | 0.45 | 2.19 | 0.72 | 0.74 |
| RQR5 | 0.49 | 2.58 | 0.69 | 0.71 |
| RQR6 | 0.77 | 3.01 | 0.68 | 0.69 |
| RQR7 | 0.90 | 3.48 | 0.66 | 0.68 |
| RQR8 | 1.02 | 3.97 | 0.65 | 0.68 |
| RQR9 | 0.31 | 5.00 | 0.65 | 0.68 |
| RQR10 | 1.20 | 6.57 | 0.69 | 0.72 |
), ArticleFig(id=1154354081079481033, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=CN, label=表 3, caption=
附加过滤拟合计算结果, figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 附加过滤厚度 /mm | 第一半值层 /mm | 同质系数 实测值 | 同质系数 推荐值 |
| RQR2 | 0.37 | 1.42 | 0.81 | 0.81 |
| RQR3 | 0.24 | 1.78 | 0.76 | 0.76 |
| RQR4 | 0.45 | 2.19 | 0.72 | 0.74 |
| RQR5 | 0.49 | 2.58 | 0.69 | 0.71 |
| RQR6 | 0.77 | 3.01 | 0.68 | 0.69 |
| RQR7 | 0.90 | 3.48 | 0.66 | 0.68 |
| RQR8 | 1.02 | 3.97 | 0.65 | 0.68 |
| RQR9 | 0.31 | 5.00 | 0.65 | 0.68 |
| RQR10 | 1.20 | 6.57 | 0.69 | 0.72 |
), ArticleFig(id=1154354081154978506, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 附加过滤厚度 /mm | 比值 | 同质系数 |
| RQR2 | 0.37 | 0.491 | 0.81 |
| RQR3 | 0.24 | 0.490 | 0.76 |
| RQR4 | 0.45 | 0.491 | 0.72 |
| RQR5 | 0.49 | 0.494 | 0.69 |
| RQR6 | 0.77 | 0.503 | 0.68 |
| RQR7 | 0.90 | 0.502 | 0.66 |
| RQR8 | 1.02 | 0.503 | 0.65 |
| RQR9 | 0.31 | 0.496 | 0.65 |
| RQR10 | 1.20 | 0.495 | 0.69 |
), ArticleFig(id=1154354081268224715, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790699928907996, language=CN, label=表 4, caption=
附加过滤的结果验证, figureFileSmall=null, figureFileBig=null, tableContent=
| 辐射质 | 附加过滤厚度 /mm | 比值 | 同质系数 |
| RQR2 | 0.37 | 0.491 | 0.81 |
| RQR3 | 0.24 | 0.490 | 0.76 |
| RQR4 | 0.45 | 0.491 | 0.72 |
| RQR5 | 0.49 | 0.494 | 0.69 |
| RQR6 | 0.77 | 0.503 | 0.68 |
| RQR7 | 0.90 | 0.502 | 0.66 |
| RQR8 | 1.02 | 0.503 | 0.65 |
| RQR9 | 0.31 | 0.496 | 0.65 |
| RQR10 | 1.20 | 0.495 | 0.69 |
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