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Description of ASTM-E2426 2010ASTM E2426 - 10Standard Practice for Pulse Counting System Dead Time Determination by Measuring Isotopic Ratios with SIMSActive Standard ASTM E2426 | Developed by Subcommittee: E42.06 Book of Standards Volume: 03.06 ASTM E2426Significance and Use Electron multipliers are commonly used in pulse-counting mode to detect ions from magnetic sector mass spectrometers. The electronics used to amplify, detect and count pulses from the electron multipliers always have a characteristic time interval after the detection of a pulse, during which no other pulses can be counted. This characteristic time interval is known as the dead time. The dead time has the effect of reducing the measured count rate compared with the true count rate. In order to measure count rates accurately over the entire dynamic range of a pulse counting detector, such as an electron multiplier, the dead time of the entire pulse counting system must be well known. Accurate count rate measurement forms the basis of isotopic ratio measurements as well as elemental abundance determinations. The procedure described herein has been successfully used to determine the dead time of counting systems on SIMS instruments. The accurate determination of the dead time by this method has been a key component of precision isotopic ratio measurements made by SIMS. 1. Scope 1.1 This practice provides the Secondary Ion Mass Spectrometry (SIMS) analyst with a method for determining the dead time of the pulse-counting detection systems on the instrument. This practice also allows the analyst to determine whether the apparent dead time is independent of count rate. 1.2 This practice is applicable to most types of mass spectrometers that have pulse-counting detectors. 1.3 This practice does not describe methods for precise or accurate isotopic ratio measurements. 1.4 This practice does not describe methods for the proper operation of pulse counting systems and detectors for mass spectrometry. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ISO Standards ISO 21270 Surface Chemical Analysis--X-ray photoelectron and Auger electron spectrometers--Linearity of intensity scale; and references 1, 2, 10, 13 and 14 therein.ASTM Standards E673 Terminology Relating to Surface Analysis Keywords dead time; isotopic ratios; pulse counting; SIMS; Isotopic analysis; Pulse testing; SIMS (secondary ion mass spectrometry); Surface analysis; ICS Code ICS Number Code 71.040.50 (Physicochemical methods of analysis) DOI: 10.1520/E2426-10 ASTM International is a member of CrossRef. ASTM E2426The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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