ANSI N42.35-2006 pdf download American National Standard for Evaluation and Performance of Radiation Detection Portal Monitors for Use in Homeland Security
3. Definitions The following definitions apply to this standard, as well as for ANSI N42.32 [B12] 9 , ANSI N42.33 [B13], and ANSI N42.34 [B14], all of which 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.
3.1 General definitions
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 radiation as measured using a high- pressure ionization chamber, an energy compensated Geiger-Mueller (GM) tube, an energy compensated proportional counter, a tissue equivalent plastic scintillator, a scintillator with spectral compensation, or any other exposure rate instrument having a nearly constant energy response (±30% in the energy range from 60 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.
3.1.18 energy dependence: Variation in instrument response as a function of radiation energy for a constant radiation type and exposure rate referenced to air.
3.1.19 exposure rate: The measure of ionization produced in air by x-ray or gamma-ray radiation.
NOTE—The special unit of exposure rate is the Roentgen per hour, abbreviated in this standard as R/h.
NOTE—In this standard, the International System (SI) units sievert (Sv) or gray (Gy) follow in parentheses the Roentgen value R, though the two units are not physically equivalent.
ANSI N42.35-2006 pdf download
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