ANSI N42.32:2006 pdf download.Performance Criteria for Alarming Personal Radiation Detectors for Homeland Security.
3.16 effective center: For a given set of irradiation conditions, the point within a detector where the response is equivalent to that which would be produced if the entire detector was located at the point.
3.17 effective range of measurement: Range of measurements within which the requirements of this standard arc met.
3.18 energy dependence: Variation in instrument response as a function of radiation energy for a constant radiation type and exposure rate referenced to air.
3.19 exposure rate: The measure of ionitation 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 Rh.
3.20 false alarm: Alarm NOT caused by a radioactive source under the specified background conditions.
3.21 functional check: A frequently used qualitative check to determine that an instrument is operational and capable of performing its intended function.
NOTE Such checks may include, for example. buttery check, zero setting, or source response check.
3.22 indicated value: (A) A scale or decade reading. (B) The displayed value of the readout. See also:
reading
3.23 indication: Displayed signal from the instrument to the user conveying information such as scale or dccadc. status, malfunction, or other critical information.
3.24 influence quantity: Quantity that may have a bearing on the result of a measurement without being the subject of the measurement.
3.25 innocent alarm: An alarm resulting from an actual increase in radiation level, but for reasons that are not due to the detection of illicit radioactive materials.
3.26 instrument: A complete system consisting of one or more assemblies designed to quantify one or more characteristics of ionizing radiation or radioactive material.
3.27 instrument hour: That period of time that the instrument is powered on and operating.
NOTE—The number of operating instruments multiplied by the amount of time they arc operating (e.g., eight instruments operating for 3.75 h is equivalent to 30 instrument hours).
3.28 interdiction: Stopping the illicit or inadvertent movement of radioactive material that has been discovered as a result of radiation detection or measurement.
3.29 monitoring: Means provided to continuously indicate the state or condition of a system or assembly. NOTE—May also be used for the real-time measurement of radioactivity or radiation levels,
3.30 over-range response: The response of an instrument when exposed to radiation intensities greater than the upper detection limit.
3.31 performance test: An evaluation of the performance of an instrument in response to a given influence quantity.
3.32 point of measurement: Place where the conventionally true values are determined and where the reference point of the instrument is placed for test purposes.
3.41 restricted mode: An advanced opcrating mode that can be accessed by an expert user (e.g., via password) to control the parameters that can affect the result of a measurement (i.e.. radionuclide library, routine function control, calibration parameters. alarm thresholds).
NOTE May be called the “advanced” or “expert” mode.
3.42 routine test: Test that applies to each independent instrument to ascertain compliance with specified criteria
3.43 standard deslatlon: The positive square root of the variance.
3.44 standard instrument or source: (A) National standard-—a standard determined by a nationally recognized competent authority to serve as the basis for assigning values to other standards of the quantity concerned. In the U.S.. this is an instnimenl, source. or other system or device maintained and promulgated by the National Institute of Standards and Technology (NIST). (B) Primary standard—-a standard that is designated or widely acknowledged as having the highest metrological qualities and whose value is accepted without reference to other standards of the same quantity. (C) Secondary standard—a standard whose value is assigned by comparison with a primary standard of the same quantity. (D) Reference standard a standard, generally having the highest metrological quality available at a given location or in a given organization. from which measurements made there are derived. (E) Working standard—a standard that is used routinely to calibrate or check material measures, measuring insthimerns, or reference materials. A working standard is traceable to NIST (see ANSI N42.22 and ANSI N4123).
