ANSI N42.43-2006 pdf download American National Standard Performance Criteria for Mobile and Transportable Radiation Monitors Used for Homeland Security
3. 3.1 Definitions The following definitions apply to ANSI/IEEE standards that have been developed at the request of the U.S. Department of Homeland Security (DHS) for instruments to be used by DHS and emergency responders. General
3.1.1 A-weighted sound level: The frequency weighting of an acoustic spectrum according to a standardized frequency response-curve based on the frequency response of the human ear.
3.1.2 acceptance test: Evaluation or measurement of performance characteristics to verify that certain stated specifications and contractual requirements are met.
3.1.3 accepted ambient photon background: The background exposure rate as measured using a high pressure ionization chamber, an energy compensated Geiger-Mueller (G-M) tube, an energy compensated proportional counter, a tissue equivalent plastic scintillator, a scintillator with spectral compensation , or any other exposure rate meter having a nearly constant energy response (±30% in the energy range from 200 keV to 1.5 MeV).
3.1.4 accredited testing laboratory: Testing laboratory that has been accredited by an authoritative body with respect to its qualifications to perform verification tests on the type of instruments covered by this standard.
3.1.5 accuracy: The degree of agreement between the observed value and the conventionally true value of the quantity being measured.
3.1.6 adjust: To alter the reading of an instrument by means of a built-in variable (hardware or software) control.
3.1.7 alarm: An audible, visual, or other signal activated when the instrument reading or response exceeds a preset value or falls outside of a preset range.
3.1.8 calibrate: To adjust and/or determine the response or reading of a device relative to a series of conventionally true values.
3.1.9 calibration: A set of operations under specified conditions that establishes the relationship between values indicated by a measuring instrument or measuring system and the conventionally true values of the quantity or variable being measured.
3.1.10 check source: A not-necessarily calibrated source that is used to confirm the continuing functionality of an instrument.
3.1.11 coefficient of variation (COV): Ratio of the standard deviation, s, to the arithmetic mean, x , of a set of n measurements, x i , given by the following formula:
ANSI N42.43-2006 pdf download
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