1、Designation: E2023 10Standard Practice forFabrication of Neutron Radiographic Sensitivity Indicators1This standard is issued under the fixed designation E2023; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the fabrication of Sensitivity Indi-cators (SI), which can be used to determine the relative qualityof radio
3、graphic images produced by direct, thermal neutronradiographic examination.1.2 The values stated in inch-pound units are regarded to bestandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standa
4、rd to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E543 Specification for Agencies Performing Nondestruc-tive TestingE545 Test Method for Determining Image Quality in DirectTherma
5、l Neutron Radiographic ExaminationE748 Practices for Thermal Neutron Radiography of Mate-rialsE1316 Terminology for Nondestructive Examinations3. Terminology3.1 DefinitionsFor definitions of terms used in this prac-tice, see Terminology E1316, Section H.4. Summary of Practice4.1 The Sensitivity Indi
6、cator (SI) is used for qualitativedetermination of the sensitivity of detail visible on the neutronradiograph. It consists of a step wedge containing gaps andholes of known dimensions. Visual inspection of the image ofthis device provides subjective information regarding totalradiographic sensitivit
7、y with respect to the step-block material,as well as optional subjective data, regarding detrimental levelsof gamma exposure.4.2 Neutron radiography practices are discussed in PracticesE748. The neutron radiograph used to determine image qualityusing the SI shall meet the requirements of Method E545
8、.5. Significance and Use5.1 The only truly valid image quality indicator is a materialor component, equivalent to the part being neutron radio-graphed, with a known standard discontinuity, inclusion, omis-sion or flaw (reference standard comparison part). The SI isdesigned to substitute for the refe
9、rence standard, providingqualitative information on hole and gap sensitivity in a singleunit. Fabrication in accordance with this practice is vital foraccurate and consistent measurements.5.2 This practice shall be followed for the fabrication of allSIs to be used with Method E545 to determine image
10、 quality indirect thermal neutron radiography.6. Basis of Application6.1 Qualification of Nondestructive AgenciesIf specifiedin the contractual agreement, NDT agencies shall be qualifiedand evaluated as described in Practice E543. The applicableedition of Practice E543 shall be specified in the cont
11、ractualagreement.6.2 Procedures and TechniquesThe procedures and tech-niques to be utilized shall be as described in this practice unlessotherwise specified. Specific techniques may be specified in thecontractual agreement.6.3 Reporting Criteria/Acceptance CriteriaReporting cri-teria for the examina
12、tion results shall be in accordance withSections 9 and 10 unless otherwise specified. Acceptancecriteria, for example, reference radiographs, shall be specifiedin the contractual agreement.6.4 Reexamination of repaired/reworked items is not ad-dressed in this practice and, if required, shall be spec
13、ified in thecontractual document.1This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.05 onRadiology (Neutron) Method.Current edition approved Jan. 1, 2010. Published February 2010. Originallyapproved in 1999.
14、Last previous edition approved in 2004 as E2023 - 99(2004).DOI: 10.1520/E2023-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page
15、 onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Sensitivity Indicator (SI)7.1 The Sensitivity Indicator (SI) shall be constructed ofcast acrylic resin, lead (optional), and aluminum. The construc-tion and dimen
16、sions are shown in Fig. 1.7.2 The optional lead step in the SI may be replaced with ablank, cast acrylic resin step. The lead provides a visualindication of beam gamma content; however, the lead image isnot used for any of the SI calculations of Method E545.7.3 The acrylic resin shall be methylmetha
17、crylate.7.4 All dimensional tolerances are as noted on the figures.7.5 Aluminum shims and strips shall be 99.9 % pure el-emental material.7.6 The SI may be encased in a 6061 aluminum dust cover,0.012-in. thick.7.7 When used, the optional lead shim shall be at least99.9 % pure elemental material.8. F
18、abrication38.1 Components:8.1.1 Mill a Channel, 0.850-in. wide by 6.5-in. long from analuminum block, 1-in. wide by at least 0.303-in. high by 6.5-in.long. The channel should begin 0.075-in. from edge A andleave 0.103-in. aluminum in the bottom of the channel (see Fig.2).8.1.2 Mill the A Channel (se
19、e Fig. 1), within this channel,0.125-in. wide by 0.005-in. deep by 6.5-in. long. The near edgeof channel A should be 0.450-in. from edge A (see Fig. 3).8.1.3 Mill the B Channel, adjacent to the A channel,0.125-in. wide by 0.010-in. deep by 6.5-in. long. The near edgeof channel B should be 0.325-in.
20、from edge A (see Fig. 3).8.1.4 Mill the C Channel, adjacent to the B channel,0.125-in. wide by 0.020-in. deep by 6.5-in. long. The near edgeof channel C should be 0.200 in. from edge A (see Fig. 3).8.1.5 OptionalMill the D channel adjacent to the Cchannel, 0.125-in. wide by 0.010-in. deep by 6.5-in.
21、 long. Thenear edge of channel D should be 0.075-in. from edge A.NOTE 1The D channel is not required and shall not be milled if thelead shim is not to be used.8.1.6 Prepare five methylmethacrylate strips, 0.060-in. thickby at least 0.200-in. wide by 6.5-in. long. These strips will beused in 8.2.11.3
22、The instructions in Section 8 assume the simultaneous fabrication of five unitsfor practical reasons. Units may be fabricated singly, if desired.Material MethylmethacrylateShim Thickness Hole DiameterA 0.005 0.005B 0.010 0.010C 0.020 0.020D 0.010 0.010NOTE 1All dimensions are in inches.NOTE 2The lea
23、d step may be replaced with a methylmethacrylate strip with the D shim eliminated.FIG. 1 Sensitivity IndicatorE2023 102NOTE 1Unless otherwise specified, use the following:Dimensions are in inches.Tolerances on machined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 2 Main Channel in Aluminum BlockNOTE 1
24、Unless otherwise specified, use the following:Dimensions are in inches.Tolerances on machined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 3 Channels A Through D in Main ChannelE2023 1038.1.7 Prepare four methylmethacrylate strips, 0.125-in.thick by at least 0.200-in. wide by 6.5-in. long. One of them
25、ethylmethacrylate strips may be replaced with an optionallead strip of the same dimensions. These strips will be used in8.2.5.8.1.8 Prepare one strip each from aluminum shim stock, atleast 0.200-in. wide by 6.5-in. long, with the followingthicknesses:0.0005 in.0.0010 in.0.0020 in.0.0030 in.0.0040 in
26、.0.0050 in.0.0100 in.8.1.9 Prepare one methylmethacrylate strip each to fitsnugly in the 0.125-in. wide by 6.5-in. long with the followingthicknesses:0.0050 in. (Shim A)0.0100 in. (Shim B)0.0200 in. (Shim C)0.0100 in. (Shim D) (If used, this strip is to be fabricated fromlead stock (see Fig. 4). The
27、se strips will become Shim Athrough Shim D in 8.1.10.)8.1.10 Drill four holes in the shims from 8.1.9, starting0.218 in. from one end and centering the other three holes0.215 in. from the first hole. Repeat the process along the restof the 6.5-in. length (see Fig. 4). The diameter of the holes areas
28、 follows:Shim A 0.005-in. diameterShim B 0.010-in. diameterShim C 0.020-in. diameterShim D 0.010-in. diameter, if optional Shim D is to be used.To verify that the various shims have the proper holes drilledinto them, a certified hole measurement report is required.8.1.11 To keep the SI intact during
29、 use, it is highly recom-mended that a dust cover be kept on the unit. One dust coverfor each SI may be prepared from aluminum shim stock,0.012-in. thick by 1.50-in.2by cutting out a 0.250-in.2fromeach corner and folding the aluminum to form a cover, 1-in.2by0.250-in. high (see Fig. 1).8.2 Assembly:
30、8.2.1 Insert Shim C into the C channel milled in 8.1.4 (seeFig. 5).8.2.2 Insert Shim B into the adjacent B channel milled in8.1.3 (see Fig. 5).8.2.3 Insert Shim A into the adjacent A channel milled in8.1.2 (see Fig. 5).8.2.4 If the D channel was milled in 8.1.5, insert the leadshim (see Fig. 5).8.2.
31、5 Insert a 0.125-in. methylmethacrylate strip (previouslyprepared in 8.1.7) into the channel so that the second strip ispositioned over Shim C. Over Channel D, insert either theoptional lead strip or a 0.125-in. methylmethacrylate strip (seeFig. 6).8.2.6 Insert the 0.010-in. thick aluminum strip nex
32、t to themethylmethacrylate strip between the B and C channels (seeFig. 6).8.2.7 Insert another 0.125-in. methylmethacrylate strip nextto the aluminum strip (see Fig. 6).8.2.8 Insert the 0.005-in. thick aluminum strip (see Fig. 6).8.2.9 Insert the last 0.125-in. methylmethacrylate strip nextto the pr
33、eviously inserted aluminum strip (see Fig. 6).8.2.10 Insert the 0.0005-in. thick aluminum strip next to thepreviously inserted methylmethacrylate strip (see Fig. 6).8.2.11 Insert a 0.060-in. thick methylmethacrylate strip nextto the previously inserted aluminum strip (see Fig. 6).Shim Thickness Hole
34、 DiameterA 0.0050 0.0050B 0.0100 0.0100C 0.0200 0.0200D 0.0100 0.0100FIG. 4 ShimsE2023 1048.2.12 Repeat the steps described in 8.2.10 and 8.2.11,alternating increasing aluminum strip thickness with 0.060-in.thick methylmethacrylate strips (see Fig. 6), that is:0.001-in. thick aluminum strip0.060-in.
35、 thick methylmethacrylate strip0.002-in. thick aluminum strip0.060-in. thick methylmethacrylate strip0.003-in. thick aluminum strip0.060-in. thick methylmethacrylate strip0.004-in. thick aluminum strip0.060-in. thick methylmethacrylate strip8.2.13 Cut and insert aluminum shims sized as required fora
36、 tight fit between the last 0.060-in. methylmethacrylate stripand the wall of the channel to wedge all the strips in place. Thisstep is important for later machining of the unit. (See Fig. 6.)8.3 Fabrication:8.3.1 Mill off a 1.0-in. long section of the stacked channelfrom the 6.5-in. length.NOTE 1Se
37、e Fig. 4.FIG. 5 Shims in ChannelsUnless otherwise specified, use the following:Dimensions are in inches.Tolerances on machined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 6 Strips in Main ChannelE2023 1058.3.2 Mill the top surface of the sectioned unit to a height of0.303 in. This height is equivalen
38、t to the first step of 0.200 in.of methylmethacrylate (see Fig. 7).8.3.3 Mill a 0.215-in. wide channel, 0.230-in. from Edge B(as shown in Fig. 7) across the full width of the stackedassembly, including the aluminum walls. The bottom of thechannel should be 0.203 in. from the bottom of the block.8.3.
39、4 Mill another 0.215-in. wide channel, 0.445-in. fromEdge B (as shown in Fig. 8) across the full width of the stackedassembly, including the aluminum walls. The bottom of thechannel should be 0.153 in. from the bottom of the block.8.3.5 Finish milling all stock between the aluminum wallsfrom the las
40、t channel to Surface C to a height of 0.153 in. fromthe bottom of the block, as shown in Fig. 7. Do not removematerial from the aluminum walls. After completion, the blockshould look as shown in Fig. 8.8.3.6 Mill the final 0.215-in. wide channel, 0.660-in. fromEdge B, including the aluminum walls. T
41、he bottom of thechannel should be 0.128 in. from the bottom of the block (seeFig. 9).8.3.7 Machine a base in the completed unit by cutting 0.015in. from all four sides. The machining should leave a 0.080-in.thick base (see Fig. 9).8.3.8 The SI is complete and should look identical to the SIshown in
42、Fig. 1.8.3.9 Slip-fit the dust cover from 8.1.11. Do not use glue.9. Certification9.1 Upon request of the purchaser by contract or purchaseorder, any fabricator of the SI described in this practice shallprovide materials certification. To verify the details of con-struction, a measurement certificat
43、ion of individual compo-nents and assembly to verify correct location and sizes and acomparison thermal neutron radiograph of the assembled SIand a reference standard SI shall be provided.9.2 All dimensions should be measured with a micrometeror an optical comparator to determine the SI dimensions.9
44、.3 The comparison thermal neutron radiograph of theassembled SI, along with a reference standard SI, shall showthe following:9.3.1 All shims and strips are in place and aluminum stripsare vertical (no blurred edges).9.3.2 A minimum of six or seven holes should be visible,identical to those in the re
45、ference SI.9.3.3 Using a magnifier with a calibrated scale, measure thesize of the gaps and visible holes. If the measured dimensionsmatch those in the reference standard SIs image, the unit(s)are acceptable and can be certified.9.4 The comparison thermal neutron radiograph of theassembled SI with t
46、he reference standard SI shall meet qualitylevel Category I, specified in the latest edition of Method E545.9.5 Any SI certified under Method E54581 or later, isassumed to be a reference SI, unless there is known to be adisqualifying deficiency.10. Records10.1 Complete records of the fabrication det
47、ails shall bemaintained by the manufacturing facility for three years or asspecified in the basis of purchase.11. Keywords11.1 direct method; image quality indicator; neutron radi-ography; sensitivity indicator (SI)Unless otherwise specified, use the following:Dimensions are in in.Tolerances on mach
48、ined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 7 First Milled StepE2023 106Unless otherwise specified, use the following:Dimensions are in inches.Tolerances on machined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 8 Second Milled StepUnless otherwise specified, use the following:Dimensions are in inc
49、hes.Tolerances on machined dimensions: .XX = 6 .01 .XXX = 6 .002.FIG. 9 Finished BlockE2023 107ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not
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