JJG 744-2004

2 引用文献····················································································⋯⋯(1) 3 术语和计量单位··。········································································⋯⋯(1) 3.1 术语·······················································································⋯⋯(1) 3.2 计量单位·················································································⋯⋯(2) 4 概述··························································································⋯⋯(2) 5 计量性能要求··············································································⋯⋯(2) 5.1 辐射输出的空气比释动能率························································⋯⋯(2) 5.2 辐射输出的质···········································································⋯⋯(2) 5.3 辐射输出的重复性·····································································⋯⋯(2) 5.4 辐射输出的线性·............................................................................. ( 2 ) 5.5 分辨力····················································································⋯⋯(4) 5.6 辐射野与光野的一致性······························································⋯⋯(4) 5.7 X射线管的电压········································································⋯⋯(4) 5.8 X射线管的电流·................................................................:............ (4) 5.9 X射线管的焦点········································································⋯⋯(4) 5.10 加载时间···················。··························································⋯⋯(5) 6 通用技术条件··············································································⋯⋯(5) 6.1 外观和标志···········································································⋯⋯(5) 6.2 电气机械及防护性能·.......................................................................(5) 6.3 说明书····················································································⋯⋯(5) 7 计量器具控制·············································································⋯⋯(5) 7.1 检定条件··。··············································································⋯⋯(5) 7.2 检定项目·················································································⋯⋯(6) 7.3 检定方法·················································································⋯⋯(7) 7.4 检定结果的处理········································································⋯⋯(15) 7.5 检定周期·················································································⋯⋯(巧) 附录A 检定证书和检定结果通知书(内页)格式·································⋯⋯(16) A.1 检定证书(内页)格式·······························································⋯⋯(16) A.2 检定结果通知书(内页)格式······················································⋯⋯(18) 附录B 各种X射线管的型号和有关技术参数·······································⋯⋯(19) JJG 744- 2004 医用诊断X射线辐射源检定规程范围本规程适用于医用诊断X射线辐射源的首次检定、后续检定和使用中的检验。 本规程不适用于X射线(CT)辐射源、数字摄影(CR, DR)辐射源、乳腺摄影辐射源。 2 引用文献本规程引用下列文献: [I] GB 9706.12-1997《医用电气设备第一部分:安全通用要求三、并列标准诊断X射线设备辐射防护通用要求》 [21 GB 8279-2001《医用X射线诊断放射卫生防护要求》 [31 GB 9706.3-2000《医用电气设备第2部分:诊断X射线发生装置的高压发生器专用安全要求》 [4] GB 3100一3102-1993《量和单位》 [5] GB/T 11755.1一11755.2-1989《医用诊断X射线机管电压和管电流测试方法》 [6] GB/T 10149-1988《医用X射线设备术语和符号》 [7] SJ/T 11094-1996《医用X射线图像增强器电视系统性能参数测量方法》 [8] WS/T 189-1999《医用X射线诊断影像质量控制检测规范》 仁9] YY/T 0063-2000《医用诊断X射线管组件焦点特性》 [10] Federal Performance Standard for Diagnostic X一ray Systems and Their Major Compo- nents; Final Rule. Depar tment of Health and Human Services Food and Drug Administration 21 CFR Par t 1020 [Federal Register: Mayl9, 1994] Part VI 使用本规程时,应注意使用上述引用文献的现行有效版本。 3 术语和计,单位 3.1 术语 3.1.1 比释动能kerma 不带电电离粒子,在质量为dm的某种物质中释放出来的全部带电粒子的初始动能总和d药r除以dm。符号为Ko 3.1.2 比释动能率kerma rate 在dt时间内比释动能的增量dK除以dt。符号为天。 3.1.3 半价层half - value layer 将单向粒子流的辐射量减少到初始值一半时的减弱层厚度。符号为HVL o 3.1.4 X射线管电压X一ray tube voltage 加在X射线管阳极和阴极之间的电位差。 t JJG 744- 2004 通常,X射线管电压用千伏(kV)峰值表示。 3.1.5 标称X射线管电压nominal X一ray tube voltage 在规定条件下允许的最高X射线管电压。 3.1.6 焦一皮距focal spot to skin distance 在X射线诊断中,指有效焦点基准平面至基准方向垂直并包含患者表面与辐射源最近的平面距离。 3.1.7 焦点标称值nominal focal spot value 在规定的条件下测量的与X射线管有效焦点尺寸有特定比例的无量纲数值。 3.1.8 有效焦点effective focal spot 实际焦点在基准平面上的垂直投影。 3.1.9 实际焦点actual focal spot 靶面上阻拦截止加速粒子束的区域。 3.2 计量单位 3.2.1 比释动能率单位的名称:戈[瑞]每秒;符号:Gy/so 3.2.2 分辨力〔率」的名称:线对每厘米;符号:Lp/cmo 3.2.3 长度单位的名称:厘米;符号:cm. 4 概述医用诊断X射线