IEC TS 63050:2019 pdf download

IEC TS 63050:2019 pdf download.Radiation protection instrumentation – Dosemeters for pulsed fields of ionizing radiation
1 Scope
This document applies to all types of dosemeters, irrespective of the type of radiation intended to be measured. Tests according to this document determine whether a single radiation pulse can be measured correctly even if the dosemeter is in the internal state relevant for measuring background or environmental radiation. The characteristics of the dosemeter for repeated pulses is expected to be better than for one single radiation pulse with the same parameters but worse than for continuous radiation, i.e., in between of the characteristics for these two extreme conditions. The pulsed radiation source is characterized by the parameters: – the maximum dose rate during the radiation pulse, max pulse, H & , occurring at the workplace, – the maximum dose per radiation pulse, H pulse,max , occurring at the workplace, – the minimum radiation pulse duration, t pulse,min , occurring at the workplace, and – the range of the pulse repetition frequency, f pulse , occurring at the workplace. Annex A gives some parameter values for typical workplaces where pulsed radiation occurs. This document considers the pulsation of the radiation field as an additional influence quantity like particle energy and direction of radiation incidence. Therefore, the tests described are additional to all the tests in the instrument specific standards. This document describes methods to determine the following characteristic parameters of the dosemeters: – the maximum measurable dose rate in the pulse, max meas, H & , – the maximum measurable dose in the pulse, max meas, H , – the minimal pulse duration, t meas,min , and – the range for the pulse repetition frequency, f meas,min to f meas,max . NOTE These parameters may be inter-related depending on the detector used. It is applicable to photon radiation but basically can be adapted to all types of radiation for which a suitable pulsed reference field is available. The term dose is used in this document in the sense of dose equivalent.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-395, International Electrotechnical Vocabulary (IEV) – Part 395: Nuclear instrumentation – Physical phenomena, basic concepts, instruments, systems, equipment and detectors IEC 61 267:2005, Medical diagnostic X-ray equipment – Radiation conditions for use in the determination of characteristics ISO 4037-3:201 9, Radiological protection – X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy – Part 3: Calibration of area and personal dosemeters and the measurement of their response as a function of energy and angle of incidence ISO TS 1 8090-1 :201 5, Radiological protection – Characteristics of reference pulsed radiation – Part 1: Photon radiation
3 Terms and definitions, abbreviated terms and symbols, quantities and units
3.1 .5 internal state soft and hardware parameters set internally (by the dosemeter) EXAMPLE: When the dosemeter is for a long time span not exposed to any artificial radiation then the sensitivity and the cycle time are set to the maximum values to indicate the dose value with the highest resolution possible and to reduce the coefficient of variation of the indication. 3.1.6 maximum measurable dose in the radiation pulse max meas, H maximum value of one radiation pulse dose which can be measured by the dosemeter without exceeding stated maximum errors 3.1.7 maximum measurable dose rate in the radiation pulse max meas, H & maximum value of one radiation pulse dose rate which can be measured by the dosemeter without exceeding stated maximum errors 3.1 .8 maximum radiation pulse dose H pulse,max maximum dose of one radiation pulse occurring at a point in the radiation field 3.1.9 maximum radiation pulse dose rate max pulse, H & maximum radiation pulse dose rate occurring at a point in the radiation field 3.1 .1 0 measurement cycle time T cycle time interval required by the counting dosemeter for one sequence of the repeated operations to determine the actual value of the indication 3.1.1 1 pulsed radiation <area and individual dosimetry> ionizing radiation which never has a constant dose rate at a given point in space for time intervals longer than 1 0 s [SOURCE: ISO TS 1 8090-1 :201 5, 3.9] 3.1.1 2 radiation pulse abrupt variation of short duration of the radiation dose rate from zero followed by a rapid return to zero [SOURCE: IEC 60050-702:1 992, 702-03-01 , modified: The term “pulse” has been replaced by “radiation pulse” and the words “a physical quantity” and “the initial value” have been replaced by “the radiation dose rate from zero” and “zero”.