标准摘要
[中文适用范围]： 本部分ISO 16526规定了X射线系统的恒定性检查，主要检查X射线电压，同时也检查管电流和靶材组成（可能因管子老化而变化）。 厚滤光片方法基于使用定义的厚滤光片后测量剂量率，使用定义的X射线管、滤光片和测量设备之间的距离。 该方法对电压变化非常敏感，但不提供X射线管电压的绝对值。因此，需要参考值，并建议在系统验收测试中找到此参考值。 厚滤光片方法是一种相当简单的技术，可由X射线系统操作员定期执行系统恒定性检查。 此方法适用于所有类型的X射线系统，即管电流大于1 mA的恒定电位、半波和脉冲波发生器。 [外文原描述]： ISO 16526-2:2011 specifies a constancy check of a X-ray system where mainly the X-ray voltage is checked and also the tube current and the constitution of the target which can be changing due to ageing of the tube. The thick filter method is based on a measurement of the dose rate behind a defined thick filter using defined distances between the X-ray tube, the filter and the measuring device. This method is very sensitive to changes of the voltage, but it does not provide an absolute value for the X-ray tube voltage. Therefore, a reference value is needed and, it is recommended to find this reference, for example, within the acceptance test of the system. The thick filter method is a rather simple technique and may be applied by the operator of an X-ray system to perform regularly a constancy check of the system. The method can also be applied for consistency checks after changing components which may affect the X-ray tube voltage. This method can be applied for all types of X-ray systems, i. e. for constant potential, half wave and impulse wave generators with a tube current larger than 1 mA.
英文名称Non-destructive testing — Measurement and evaluation of the X-ray tube voltage — Part 2: Constancy check by the thick filter method