1、Designation:C127097(Reapproved 2012)Standard Practice forDetection Sensitivity Mapping of In-Plant Walk-ThroughMetal Detectors1This standard is issued under the fixed designation C1270;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONNuclear regulatory authorities require personnel entering designated security areas to be screenedfor conceale
3、d weapons.Additionally,in security areas containing specified quantities of specialnuclear materials,exiting personnel are required to be screened for metallic nuclear shielding material.Walk-through metal detectors are widely used to implement these requirements.A number of environmental conditions
4、,architectural and electrical arrangements near the detector,and detector characteristics affect the detection of metallic objects passing through the walk-throughmetal detector.These external effects and detector characteristics are discussed in Practices F1468 andC1269,and Guide C1238.This practic
5、e is intended to minimize the effects of these variables ondetector operation by providing the operator with baseline information on the metal detectionsensitivity within the portal aperture,particularly the location of any weak areas of detection.The datais obtained by mapping the detection zone(vo
6、lume within the portal)of each detector at its fieldlocation,under normal operating conditions,and using the target test object.The maps,when appliedto detector operation,ensure that the effects of the fixed environmental conditions,architectural andelectrical arrangements,and detector characteristi
7、cs are taken into account during operationalsensitivity adjustment,performance evaluation,and general operation of detectors.1.Scope1.1 This standard practice covers a procedure for determin-ing the weakest detection path through the portal aperture andthe worst-case orthogonal orientation of metall
8、ic test objects.Itresults in detection sensitivity maps,which model the detectionzone in terms related to detection sensitivity and identify theweakest detection paths.Detection sensitivity maps supportsensitivity adjustment and performance evaluation procedures(see Practices C1269 and C1309).NOTE1U
9、nsymmetrical metal objects possessing a primary longitu-dinal component,such as handguns and knives,usually have oneparticular orientation that produces the weakest detection signal.Theorientation and the path through the detector aperture where the weakestresponse is produced may not be the same fo
10、r all test objects,even thosewith very similar appearance.NOTE2In the case of multiple specified test objects or for test objectsthat are orientation sensitive,it may be necessary to map each objectseveral times to determine the worst-case test object or orientation,orboth.1.2 This practice is one o
11、f several developed to assistoperators of walk-through metal detectors with meeting themetal detection performance requirements of the responsibleregulatory authority.(See Appendix X2)1.3 This practice is neither intended to set performancelevels,nor limit or constrain operational technologies.1.4 T
12、his practice does not address safety or operationalissues associated with the use of walk-through metal detectors.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2C1238 Guide for Inst
13、allation of Walk-Through Metal Detec-torsC1269 Practice for Adjusting the Operational SensitivitySetting of In-Plant Walk-Through Metal Detectors1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.12 on SafeguardApp
14、lications.Current edition approved Jan.1,2012.Published January 2012.Originallyapproved in 1994.Last previous edition approved in 1997 as C1270 97(2003).DOI:10.1520/C1270-97R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For A
15、nnual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 C1309 Practice for Performance Evaluation of In-PlantWalk-Through Metal Detecto
16、rsF1468 Practice for Evaluation of Metallic Weapons Detec-tors for Controlled Access Search and Screening3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 clean-tester,na person who does not carry anyextraneous metallic objects that would significantly alter thesignal produced when the person carries a test object.3.1.1.1 DiscussionBy example but not limitation,suchextraneous metallic objects may include:metallic belt buckles,metal buttons,cardiac pacemakers,coins,metal frame
