BS EN ISO 20785-1-2017 pdf download.Dosimetry for exposures to cosmic radiation in civilian aircraft Part 1: Conceptual basis for measurements (ISO 20785-1:2012). This part of ISO 20785 gives the conceptual basis for the determination of ambient dose equivalent for the evaluation of exposure to cosmic radiation in civilian aircraft and for the calibration of instruments used for that purpose. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 General 2.1.1 calibration operation that, under specified conditions, establishes a relation between the conventional quantity, Ho, and the indication, G Note 1 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram, calibration curve, or calibration table. In some cases, It may consist of an additive or multiplicative correction of the indication with associated measurement uncertainty. Note 2 to entry: Calibration should not he confused with adjustment of a measuring system, often mistakenly called “self-calibration, or with verification of calibration Note 3 to entry: Often, the first step alone in the above definition is perceived as being calibration. 2.1.2 calibration coefficient Ncoe quotient ofthe conventional quantity value to be measured and the corrected indication of the instrument Notel toentry:Thecalibrationcoefficientisequivalenttothecalibrationfactormultipliedbytheinstrumentconsta nt. Note 2 to entry: The reciprocal of the calibration coefficient. N0rr. is the response. Note 3 to entry: For the calibration of some instruments, e.g. ionization chambers, the instrument constant and the calibration factor are not identified separately but are applied together as the calibration coefficient. Note 4 to entry: It is necessary, in order to avoid confusion, to state the quantity to be measured, for example: the calibration coefficient with respect to fluence, N, the calibration coefficient with respect to kerma, NK, the calibration coefficient with respect to absorbed dose, N0. 2.1.3 indication C quantity value provided by a measuring instrument or a measuring system Note 1 to entry: An indication can be presented in visual or acoustic form or can be transferred to another device. An indication is often given by the position of a pointer on the display for analogue outputs, a displayed or printed number for digital outputs, a code pattern for code outputs, or an assigned quantity value for material measures. Note 2 to entry: An indication and a corresponding value of the quantity being measured are not necessarily values of quantities of the same kind.BS EN ISO 20785-1 pdf download.
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