1、Designation:C126997(Reapproved 2012)Standard Practice forAdjusting the Operational Sensitivity Setting of In-PlantWalk-Through Metal Detectors1This standard is issued under the fixed designation C1269;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase of revision,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 scre
3、enedfor concealed weapons.Additionally,in security areas containing specified quantities of specialnuclear materials,personnel exiting the facility are required to be screened for metallic nuclearshielding material.Walk-through metal detectors are widely used to implement these requirements.Nuclear
4、regulatory authorities usually specify an assortment of metal detector test objects that mustall be detected by walk-through metal detectors.This practice provides a procedure for adjusting theoperational sensitivity setting to the lowest setting necessary to detect the least likely to-be-detectedte
5、st object in its least likely to-be-detected orientation while passing through the detection zone in theweakest known detection path.All other test objects will then be detected at this sensitivity settinganywhere in the detection zone.1.Scope1.1 This practice covers a procedure for adjusting theope
6、rational sensitivity of in-plant walk-through metal detec-tors.Performance of this procedure should result with in-plantwalk-through metal detectors being adjusted to an initialoperational sensitivity setting suitable for performance testing.1.2 This practice does not set test object specifications
7、orspecify specific test objects.These should be specified by theregulatory authority.1.3 This practice uses information developed by PracticeC1270,or an equivalent procedure,which identifies the criticaltest object(from a specified set of test objects),its criticalorientation,and the critical test p
8、ath through the detectionzone.In the case of Practice C1270,the information is foundon the detection sensitivity map(s)for each in-plant walk-through metal detector.1.4 This practice is one of several developed to assistoperators of nuclear facilities with meeting the metal detectionperformance requ
9、irements of the regulatory authorities(seeAppendix).1.5 This standard practice is neither intended to set perfor-mance levels nor limit or constrain technologies.1.6 This practice does not address safety or operationalissues associated with the use of walk-through metal detectors.1.7 The values stat
10、ed in SI units are to be regarded asstandards.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2C1238 Guide for Installation of Walk-Through Metal Detec-torsC1270 Practice for Detection Sensitivity Mapping of In-Plant Walk-Through Metal DetectorsC1309
11、Practice for Performance Evaluation of In-PlantWalk-Through Metal DetectorsF1468 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 anyextrane
12、ous metallic objects that would significantly alter thesignal produced when the person carries a test object.3.1.1.1 DiscussionSmaller test objects require more com-plete elimination of metallic objects.By example but not1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel C
13、ycle and is the direct responsibility of Subcommittee C26.12 on SafeguardApplications.Current edition approved Jan.1,2012.Published January 2012.Originallyapproved in 1994.Last previous edition approved in 1997 as C1269 97(2003).DOI:10.1520/C1269-97R12.2For referenced ASTM standards,visit the ASTM w
14、ebsite,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual 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 lim
15、itation,such extraneous metallic objects may include:metallic belt buckles,metal buttons,cardiac pacemakers,coins,metal frame eyeglasses,hearing aids,jewelry,keys,mechani-cal pens and pencils,shoes with metal shanks or arch supports,metallic surgical implants,undergarment support metal,metalzippers,
16、etc.In the absence of other criteria,a clean testerpassing through a metal detector shall not cause a disturbancesignal greater than 10%of that produced when carrying thecritical test object through the detector.Test objects requiringmore complete elimination of extraneous metal to obtain lessthan 10%signal disturbance.3.1.1.2 DiscussionThe tester shall have a weight between50 to 104 kg(110 to 230 lb)and a height between 1.44 to 1.93m(57 to 75 in.).Should a given detector be sensitive to bodysiz
