ANSI N42.43:2006 pdf download.Performance Criteria for Mobile and Transportable Radiation Monitors Used for Homeland Security.
NOTE -This and the associated uncertainty will preferably be detcnnined by a national or transkr standard. or by a reference instrument that has been calibrated against a national or transfer standard, or by a measurement quality assurance (MQA) interaction with the National Institute of Standards and Technology (NIST) or an accredited calibration laboratory. (Sec ANSI N42.22 and ANSI N42.23.)’2
3.1.13 decade: A range of values for which the upper value is a power often above the lower value.
3.1.14 detection limits: The extremes of detection or quantification for the radiation of interest.
NOTE—The lower detection limit is the minimum statistically quantifiable instrument response or reading. The upper detection limit is the maximum level at which the instrument meets the required accuracy.
3.1.15 detector: A device or component designed to produce a quantifiable response to ionizing radiation normally measured electronically.
3.1.16 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.
3.1.17 effective range of nicasurenient: Range of measurements within which the requirernctns of this standard are met.
3.l.IS encrg 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: 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 Rh.
3.1.20 false alarm: Alarm NOT caused by a radioactive source under the specified background conditions.
3.1.21 functional check: A frequently-used qualitative check to detennine that an instrument is operational and capable of perfonning its intended function,
NOTE Such checks may include, for example. battery check, zero setting, or source response check.
3.1.22 indicated salue: (A) A scale or decade reading. (B) The displayed value of the readout. See also:
reading.
3.1.23 indication: Displayed signal from the instrument to the user conveying information such as scale or decade. status, malfunction or other critical information.
3.1.24 influence quantity: Quantity that may have a bearing on the result of a measurement without being the subject of the measurement.
3.1.25 innocent alanii: An alarm resulting from an actual increase in radiation level, but for reasons that are not due to the detection of illicit radioactive materials.
NOTE—Also known as nuisance alarm.
3.1.26 instrument: A complete system consisting of onc or more assemblies designed to quantify one or more characteristics of ionizing radiation or radioactive material.
3.1.27 instrument hour: The number of operating instruments multiplied by the amount of time they arc operating (i.e., S instruments operating for 3.75 h is equivalent to 30 instrument hours).
3.1.28 interdiction: Slopping the illicit or inadvertent movement of radioactive material that has been discovered as a result of radiation detection or measurement.
3.1.29 monitorIng: Means provided to continuously indicate the state or condition of a system or assembly.
NOTE— May also bc used for the real-time measurement of radioactivity or radiation levels.
3.1.30 overload response: See: over-range response.
3.1.31 over-range response: The response of an instrument when exposed to radiation intensities greater than the upper measurement limit. Syn: overload response.
3.1.32 perforniance test: An evaluation of the performance of an instrument in rcsponse to a given influence quantity.
3.1.33 point of measurement: Place where the conventionally true values are determined and where the reference point of the instrument is placed for test purposes.
3.1.34 precision: Degree of agreement of repeated measurements of the same parameter.
3.1.35 range: All values lying between the lower and upper detection limits.
3.1.36 reading: The indicated or displayed value of the readout.
3.1.37 readout: The portion of time instrument that provides a visual display of the response of the instrument or the displayed value, with units, displayed andor recorded by the instrument as a result of the instrument’s response to some influence quantity.
3.1.38 reference point of an instrument: Physical mark, or marks, on the outside of an instrument used to position it at a point where the conventionally true value of a quantity is to be measured, unless the position is clearly identi liable from the construction of the instrument.
