中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2015年
5期
371-375
,共5页
校准装置%标准辐射质%乳腺X射线摄影剂量仪
校準裝置%標準輻射質%乳腺X射線攝影劑量儀
교준장치%표준복사질%유선X사선섭영제량의
Calibration apparatus%Standard radiation quality%X-ray mammography dosimeter
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(φ40 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.
目的 通過對二級標準劑量實驗室(SSDL)標準輻射質建立和標準程序實施,滿足校準裝置不確定度要求.方法 根據國際電工委員會(IEC) 61267-2005和國際原子能機構(IAEA)TRS No 457對用于乳腺X射線攝影所推薦繫列RQR-M和RQA-M標準輻射質,2006-2014年對校準裝置10箇響應量進行長期穩定性實驗,包括輻射場均勻性、平均比釋動能變化率、散射輻射份額等.此外,在2008年和2012年2次將參攷劑量儀器溯源到德國聯邦物理技術研究院(PTB)國傢一級標準劑量學實驗室(PSDL).結果 輻射場均勻性(φ40 mm)為±1.4％,校準裝置長期穩定性變異限值＜±2％,在測量點上散射輻射貢獻份額＜0.12％.溯源到德國PTB實驗室(PSDL)校準因子在0.999～1.000的範圍內,校準裝置擴展不確定度為±3.0％(k=2,95％置信度).結論 該校準裝置可以滿足IEC 61267-2005和IAEA TRS No 457要求,併已通過國傢計量認證,可以用于乳腺X射線攝影劑量儀的校準.
목적 통과대이급표준제량실험실(SSDL)표준복사질건립화표준정서실시,만족교준장치불학정도요구.방법 근거국제전공위원회(IEC) 61267-2005화국제원자능궤구(IAEA)TRS No 457대용우유선X사선섭영소추천계렬RQR-M화RQA-M표준복사질,2006-2014년대교준장치10개향응량진행장기은정성실험,포괄복사장균균성、평균비석동능변화솔、산사복사빈액등.차외,재2008년화2012년2차장삼고제량의기소원도덕국련방물리기술연구원(PTB)국가일급표준제량학실험실(PSDL).결과 복사장균균성(φ40 mm)위±1.4％,교준장치장기은정성변이한치＜±2％,재측량점상산사복사공헌빈액＜0.12％.소원도덕국PTB실험실(PSDL)교준인자재0.999～1.000적범위내,교준장치확전불학정도위±3.0％(k=2,95％치신도).결론 해교준장치가이만족IEC 61267-2005화IAEA TRS No 457요구,병이통과국가계량인증,가이용우유선X사선섭영제량의적교준.
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.
