ASTM_C_1238_-_97_2012.pdf

Designation:C123897(Reapproved 2012)Standard Guide forInstallation of Walk-Through Metal Detectors1This standard is issued under the fixed designation C1238;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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.1.Scope1.1 Some facilities require that personnel entering desig-nated areas be screened for concealed weapons and othermetallic materials.Also,personnel exiting designated areas areoften screened for metallic shielding material and other typesof metallic contraband.Walk-through metal detectors arewidely used to implement these requirements.This guidedescribes various elements to be considered when planning toinstall walk-through metal detectors.1.2 This guide is not intended to set performance levels,noris it intended to limit or constrain operational technologies.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 standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 NRC Document:NUREG-1329 Entry/Exit Control At Fuel Fabrication Fa-cilities Using or Possessing Formula Quantities of Strate-gic Special Nuclear Material22.2 U.S.Government Documents:DOE 5632.2A Physical Protection of Special Nuclear Mate-rials and Vital Equipment,February 9,19883DOE 5633.3 Control and Accountability of Nuclear Materi-als,February 3,198832.3 National Fire Protection Associations(NPA)Life SafetyCode Handbook:NFPA-101-1988,Chapter 28,Industrial Occupancy42.4 ANSI Standard:Z41.1-PT-1983Class 50 and 75For Non-ferrous andFerrous Safety Footwear52.5 National Institute of Law Enforcement and CriminalJustice(NILECJ)Standard:0601.00 For Design,Performance,and Allowable MagneticField Strength33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 continuous-wave-type metal detectora system gen-erally employing one or more pairs of closely coupled coils.One coil is electrically energized to establish an electromag-netic field;the other detects disturbances in that field.Inoperation,the coils are configured so that the person or objectbeing screened passes through the field.When metal passesthrough the field,the field is modified by the magnetic andelectrical properties of the metal.Any change in the field issensed by measuring one or more of many possible parameters,including mutual inductance,power loss,phase shift,fre-quency shift,permeability,etc.3.1.2 nuisance alarman alarm not caused by a weapon orshielding material but by other causes such as outside interfer-ence or other operationally or environmentally induced stimu-lus.In practice,these alarms are a nuisance because they arenot obvious and must be investigated and the cause eliminated.3.1.3 pulse-wave-type metal detectorsa system in whichbrief current pulses are generated in transmitter coils when theyare switched on.The electromagnetic field generated by thesepulses induces eddy currents in metallic objects in the field.The eddy currents decay when the transmitter coils are shut off.The decay of the eddy currents produces secondary voltages inthe receiver coils,which are switched on only when thetransmitter coils are switched off.The voltages induced in thereceiver coils are processed and compared against a bias orbackground level.3.1.4 shieldinga metallic material configured as a crediblegamma-radiation shield for special nuclear materials(SNM).3.1.5 throughputthe actual rate at which a metal detectorand system can screen personnel for a given application.1This guide is under the jurisdiction of ASTM Committee C26 on Nuclear FuelCycle and is the direct responsibility of Subcommittee C26.12 on SafeguardApplications.Current edition approved Jan.1,2012.Published January 2012.Originallyapproved in 1993.Last previous edition approved in 1997 as C1238-97(2003).DOI:10.1520/C1238-97R12.2Available from the U.S.Nuclear Regulatory Commission,Washington,DC20555.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.4Available from National Fire Protection Association(NFPA),1 BatterymarchPark,Quincy,MA 02169-7471,http:/www.nfpa.org.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6 walk-through metal detectora free-standing screen-ing device having an electromagnetic field within its portalstructure(aperture)for detecting metallic objects,includingsome nuclear shielding materials,carried by persons walkingthrough the aperture.3.1.7 weapona device intende