Standard Test Method for Determining the Focal （标准试验方法确定焦点）.pdfVIP

Designation: E 1114 – 92 (Reapproved 1997)1 An American National Standard Standard Test Method for Determining the Focal Size of Iridium-192 Industrial Radiographic Sources1 This standard is issued under the fixed designation E 1114; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval. 1 NOTE—Section 10 was added editorially in February 1997. 1. Scope be determined. The appropriate apparatus and equipment for 1.1 This test method covers the determination of the focal the safe storage, handling, and manipulation of the subject size of an iridium-192 radiographic source. The determination source, such as a radiographic exposure device (also referred to is based upon measurement of the image of the iridium metal as a gamma ray projector or camera), remote control, source source in a projection radiograph of the source assembly and guide tube, and source stop are also required. comparison to the measurement of the image of a reference 5.2 Reference Sample (see Figs. 1-3)—The reference sample in the same radiograph. sample shall be of material which is not radioactive. The 1.2 This standa