注:这不是参考射线照片；要购买参考射线照片，请选择左侧的关键附件/参考射线照片链接。 1.1这些参考射线照片 是原始射线照片的复制品，作为确定钢铸件中可能通过射线照相检查发现的不连续的类别和严重程度的手段提供。可根据合同规范使用。 1.2用于评估的射线照片应与这些参考射线照片进行比较，以便根据不连续的类别和严重程度进行分类。 这些参考射线照片适用于2至4 1/2英寸的标称截面厚度。（51至114毫米）。 1.3这些参考射线照片由以下三组单独组成: 1.3.1 1毫伏X射线和铱-192辐射（在以前的版本中称为“1至2兆电子伏X射线”）。 1.3.2 2毫伏X射线和钴-60（在以前的版本中称为“伽马射线”）——这包括钴-60或等效同位素辐射以及从2毫伏到4毫伏的X射线。 1.3.3 4-MV至30-MV X射线（在以前的版本中称为“10至24 MeV X射线”）。 1.4每套仅用于与等效辐射产生的射线照片进行比较，包括三类严重程度越来越高的分级不连续，以及三类仅作为示例提供的未分级不连续，如下所示: 1.4.1 A类-气体孔隙度；严重性级别1至5。 1.4.2 B类-砂和夹渣；严重性级别1至5。 1.4.3 C类——收缩；3种类型: 1.4.3.1类型1-严重程度1至5级。 1.4.3.2类型2-严重程度1至5级。 1.4.3.3类型3-严重程度1至5级。 1.4.4 D类-裂纹；一个插图 D3 1972年以前的文件中。 1.4.5 E类-热撕裂；一个插图 D3 1972年以前的文件中。 1.4.6 F类-插入；1972年以前的文件中有一个插图EB3。 1.5本文件的使用不限于文件标题中包含的特定能级或绝对厚度限制。标题旨在描述而非限制性。在没有其他适用文件的情况下，本文件可用于其他能级或厚度，或两者兼有，且买方和制造商已就此达成协议。 注:一组参考射线照片包括以下内容:Vol1:1-MV X射线和铱-192参考射线照片-一组28块板（5×8英寸（127×203毫米））英寸 a 15 17英寸。（381×432 mm）环形活页夹。第2卷:2-MV X射线和钴-60参考射线照片-一套28块板（5×8英寸）在里面 a 15 17英寸。环形活页夹。第3卷:4-MV至30-MV X射线参考射线照片-一套28块板（5×8英寸）在里面 a 15 17英寸。环形活页夹。 1.6以英寸-磅为单位的数值应视为标准值。

Note—This is not a reference radiograph; to purchase the reference radiograph, choose the Critical Adjuncts/Reference Radiographs link at left. 1.1 These reference radiographs are reproductions of original radiographs and are supplied as a means for establishing the categories and severity levels of discontinuities in steel castings that may be revealed by radiographic examination. They may be used in accordance with contractual specifications. 1.2 Radiographs for evaluation are to be compared with these reference radiographs for classification on the basis of the category and severity level of the discontinuity. These reference radiographs are applicable to nominal section thicknesses of 2 to 4 1/2 in. (51 to 114 mm). 1.3 These reference radiographs consist of three separate sets as follows: 1.3.1 1-MV X rays and Iridium-192 radiation (called "1 to 2-MeV X rays" in previous editions). 1.3.2 2-MV X rays and Cobalt-60 (called "gamma rays" in previous editions)-This includes cobalt-60 or equivalent isotope radiation and from 2-MV up to 4-MV X rays. 1.3.3 4-MV to 30-MV X rays (called "10 to 24-MeV X rays" in previous editions). 1.4 Each set is for comparison only with the radiographs produced with equivalent radiation and consists of three categories of graded discontinuities in increasing severity levels, and three categories of ungraded discontinuities furnished as examples only, as follows: 1.4.1 Category A -Gas porosity; severity levels 1 through 5. 1.4.2 Category B -Sand and slag inclusion; severity levels 1 through 5. 1.4.3 Category C -Shrinkage; 3 types: 1.4.3.1 Type 1 -Severity levels 1 through 5. 1.4.3.2 Type 2 -Severity levels 1 through 5. 1.4.3.3 Type 3 -Severity levels 1 through 5. 1.4.4 Category D -Crack; one illustration D3 in pre-1972 documents. 1.4.5 Category E -Hot tear; one illustration D3 in pre-1972 documents. 1.4.6 Category F -Insert; one illustration EB3 in pre-1972 documents. 1.5 The use of this document is not intended to be restricted to the specific energy level or to the absolute thickness limits that are contained in the document title. The title is intended to be descriptive and not restrictive. The document may be used, where there is no other applicable document, for other energy levels or thicknesses, or both, for which it is found to be applicable and for which agreement has been reached between purchaser and manufacturer. Note-The set of reference radiographs consists of the following: Vol1: 1-MV X Rays and Iridium-192 Reference Radiographs -Set of 28 plates (5 by 8 in. (127 by 203 mm)) in a 15 by 17-in. (381 by 432-mm) ring binder. Vol2: 2-MV X Rays and Cobalt-60 Reference Radiographs -Set of 28 plates (5 by 8 in.) in a 15 by 17-in. ring binder. Vol3: 4-MV to 30-MV X Ray Reference Radiographs -Set of 28 plates (5 by 8 in.) in a 15 by 17-in. ring binder. 1.6 The values stated in inch-pound units are to be regarded as the standard.