| 王建超,岳保荣,尉可道.乳腺X射线摄影剂量仪校准装置的性能评价[J].中华放射医学与防护杂志,2015,35(5):371-375.Wang Jianchao,Yue Baorong,Wei Kedao.Evaluation performance of calibration apparatus for dosimeters used in X-ray mammography[J].Chin J Radiol Med Prot,2015,35(5):371-375 |
| 乳腺X射线摄影剂量仪校准装置的性能评价 |
| Evaluation performance of calibration apparatus for dosimeters used in X-ray mammography |
| 投稿时间：2014-08-12 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.05.014 |
| 中文关键词: 校准装置 标准辐射质 乳腺X射线摄影剂量仪 |
| 英文关键词:Calibration apparatus Standard radiation quality X-ray mammography dosimeter |
| 基金项目:公益性行业科研专项(201002009) |
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| 中文摘要: |
| 目的 通过对二级标准剂量实验室(SSDL)标准辐射质建立和标准程序实施,满足校准装置不确定度要求. 方法 根据国际电工委员会(IEC)61267-2005和国际原子能机构(IAEA)TRS No 457对用于乳腺X射线摄影所推荐系列RQR-M和RQA-M标准辐射质,2006—2014年对校准装置10个响应量进行长期稳定性实验,包括辐射场均匀性、平均比释动能变化率、散射辐射份额等.此外,在2008年和2012年2次将参考剂量仪器溯源到德国联邦物理技术研究院(PTB)国家一级标准剂量学实验室(PSDL).结果 辐射场均匀性(φ 40 mm)为±1.4%,校准装置长期稳定性变异限值<±2%,在测量点上散射辐射贡献份额<0.12%.溯源到德国PTB实验室(PSDL)校准因子在0.999~1.000的范围内,校准装置扩展不确定度为±3.0%(k=2,95%置信度).结论 该校准装置可以满足IEC 61267-2005和IAEA TRS No 457要求,并已通过国家计量认证,可以用于乳腺X射线摄影剂量仪的校准. |
| 英文摘要: |
| Objective To fulfill the requirements for uncertainty of the calibration apparatus for dosimeters used in X-ray mammography through setting standard radiation quality at the SSDL and developing calibration procedures. Methods According to IEC 61267-2005 and IAEA TRS No 457 to recommend RQR-M and RQA-M series standard radiation quality, the calibration apparatus was evaluated for long term stability of the radiation field over 8 years from 2006 to 2014, including 10 response quantities, such as field homogeneity, change rate of mean air kerma and scatter radiation contributions and so on. In addition, the reference dose instrument was traced back to the PSDL of PTB in Germany by post during 2008 and 2012. Results The field homogeneity (φ 40 mm) relative error was ±1.4%. The long term stability of the calibration apparatus was less than ±2%(limits of variation). The scatter radiation contributions at their points of test were below 0.12%. The calibration factors traced to PTB were 0.999-1.000. As a result of the calibration apparatus, the expanded uncertainty was ±3% (k=2, 95% confidence interval). Conclusions The calibration apparatus may meet the requirements of IEC 61267-2005 and IAEA TRS No 457 and has obtained the license of metrology from national regulatory authority. The laboratory now performs very well to calibrate dosimeters used in X-ray mammography. |
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