ANSI N42.54:2018 pdf free download – American National Standard Instrumentation and Systems for Monitoring Airborne Radioactivity
in-leakage: The amount of material mixing with a sampling system from outside the sampling pathway as a percentage of the flow rate. latching alarms: Alarms that only reset with user interaction. may: A safe harbor method by which compliance ensures adherence to that aspect of this standard (ANSI N42.54) but is not required. mass flow rate: The volumetric flow rate corrected to a reference temperature and pressure [i.e., typical units are standard liters per minute (SLPM), where the “standard” temperature and pressure is definition-dependent]. maintainability: A focus on design features that tend to reduce maintenance time and maintenance errors with the goal to reduce maintenance labor and parts obsolescence. monitoring: The real-time measurement of radioactivity or radiation levels. National Metrology Institute (NMI): National Institute of Standards and Testing (NIST) or equivalent national metrology institute. precision: A quantification of a measurements reproducibility typically defined by the standard deviation σ or coefficient of variation (CoV). Note that this metric ( σ or CoV) refers only to the measurements for which the precision is ascribed. See: coefficient of variation (CoV). performance test: Any test evaluating defined performance metrics of an instrument as a function of parametric influence quantities. purchaser: The individual, group, or institution responsible for ensuring quality requirements are met in the procurement process for products or services intended to comply with this standard, ANSI N42.54. qualification tests: Tests performed to verify that the requirements of a specification are fulfilled. These tests are subdivided into type tests and routine tests. quality: A system property that describes the amount of agreement with written expectations in performance results in an auditable configuration. NOTE—Written expectations for a technical measurement should be independently reviewed and management approved.
reproducibility: The degree of agreement between repeated measurements of the same property. response: An indication of a material property such as a specified activity level. response time: The time taken to indicate an instantaneous change from 10% to 90% of the conventionally true activity at the rated nominal flow rate. representative sampling: An air sample that meets sufficient quality requirements to enable direct use of air volume to meet specifications on assays of radioactivity air concentrations. retrospective evaluation: Laboratory analysis of a sample after removal from the sampling instrument. routine tests: Tests that each individual instrument is subjected to, during or after manufacture, to ascertain whether it complies with certain criteria. sampling: The process of collecting a sample from a volume of an atmosphere. shall: A requirement essential to compliance with this standard, ANSI N42.54. should: A recommended practice that if not implemented shall have documentation giving the reasons and justification for the same. NOTE—This intentionally means that if should is not implemented when called out in this standard, ANSI N42.54, then there shall be a technical basis document containing an explanation as to why this is acceptable standard temperature and pressure (STP) (not a universal definition): In order to use this, a reference temperature and pressure shall be specified and should be used consistently during testing, calibration, and use. surface emission rate: The rate at which particles are ejected from a radiation source. Although this typically is used only for beta sources due to backscatter off the substrate, it can also apply to alpha sources.