无损检测 射线检测 工业射线伽马源尺寸的测定

[中文适用范围]： 本文件规定了通过 X 射线照相法确定由放射性核素铱 192、镱 169、硒 75 或钴 60 制成的 0.5 毫米或更大工业射线照相伽马源尺寸的测试程序。伽马辐射源的源尺寸是影响伽马射线图像质量的重要因素。源尺寸的确定精度为 ±10%，但通常不超过 ±0.1 毫米。源尺寸由制造商提供，为源插件的机械尺寸。如果在将源放入支架后验证或监控制造过程，则可能需要进行测量。经过验证后，本文件可用于其他放射性核素。标准测试方法 ASTM E1114 提供了有关测量 Ir-192 源尺寸、源形状特性及其正确组装和包装的更多信息。 [外文原描述]： This document specifies a test procedure for determination of the size of industrial radiographic gamma sources of 0,5 mm or greater, made from the radionuclides Iridium 192, Ytterbium 169, Selenium 75 or Cobalt 60, by a radiography method with X-rays. The source size of a gamma radiation source is an important factor which affects the image quality of gamma ray images. The source size is determined with an accuracy of ±10 % but typically not better than ±0,1 mm. The source size is provided by the manufacturer as the mechanical dimension of the source insert. A measurement can be required if the manufacturing process is validated or monitored after implementation of the source into the holder. This document can be used for other radionuclides after validation. The standard test method ASTM E1114 provides further information on the measurement of the Ir-192 source size, the characterization of the source shape, and its correct assembly and packaging.