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eLibrary > BS EN IEC 61674:2024 Medical electrical equipment. Dosimeters with ionization chambers and/or semiconductor detectors as used in X-ray diagnostic imaging >

BS EN IEC 61674:2024 Medical electrical equipment. Dosimeters with ionization chambers and/or semiconductor detectors as used in X-ray diagnostic imaging, 2024

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BS EN IEC 61674:2024 Medical electrical equipment. Dosimeters with ionization chambers and/or semiconductor detectors as used in X-ray diagnostic imaging, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope and object [Go to Page]
1.1 Scope
1.2 Object
2 Normative references
3 Terms and definitions
4 General requirements [Go to Page]
4.1 Performance requirements
4.2 Reference values and standard test values
Tables [Go to Page]
Table 1 – Reference and standard test conditions
4.3 General test conditions [Go to Page]
4.3.1 Standard test conditions
4.3.2 Statistical fluctuations
4.3.3 Stabilization time
Table 2 – Number of readings required to detect true differences Δ (95 % confidence level) between two sets of instrument readings [Go to Page]
4.3.4 Adjustments during test
4.3.5 Batteries
4.4 Constructional requirements as related to performance [Go to Page]
4.4.1 Components
4.4.2 Display
4.4.3 Indication of battery condition
4.4.4 Indication of polarizing voltage failure
4.4.5 Over-ranging
4.4.6 Measuring assemblies with multiple detector assemblies
4.4.7 Radioactive stability check device
4.5 Uncertainty of measurement
5 Limits of performance characteristics [Go to Page]
5.1 Linearity
5.2 Repeatability [Go to Page]
5.2.1 General
5.2.2 Repeatability in the attenuated beam
5.2.3 Repeatability in the unattenuated beam
Table 3 – Maximum values for the coefficient of variation, vmax, for measurements in the attenuated beam
Table 4 – Maximum values for the coefficient of variation, vmax, for measurements in the unattenuated beam and mammography
5.3 Resolution of reading
5.4 Stabilization time
5.5 Effect of pulsed radiation on air kerma and air kerma length product measurements
5.6 Stability [Go to Page]
5.6.1 Long term stability
5.6.2 Accumulated dose stability
5.7 Measurements with a radioactive stability check device
6 Limits of variation for effects of influence quantities [Go to Page]
6.1 General
6.2 Energy dependence of response
Table 5 – Limits of variation for the effects of influence quantities
6.3 Air kerma rate dependence of air kerma and air kerma length product measurements
6.4 Dependence of detector response on angle of incidence of radiation [Go to Page]
6.4.1 Non-CT detectors
6.4.2 CT detectors
6.5 Operating voltage [Go to Page]
6.5.1 Mains-operated dosimeters
6.5.2 Battery-operated dosimeters
6.5.3 Mains rechargeable, battery-operated dosimeters
6.6 Air pressure
6.7 Air pressure equilibration time of the radiation detector
6.8 Temperature and humidity
Table 6 – Climatic conditions
6.9 Electromagnetic compatibility [Go to Page]
6.9.1 Electrostatic discharge
6.9.2 Radiated electromagnetic fields
6.9.3 Conducted disturbances induced by bursts and radio frequencies
6.9.4 Voltage dips, short interruptions and voltage variations
6.10 Field size
6.11 Effective length and spatial uniformity of response of CT dosimeters
7 Marking [Go to Page]
7.1 Detector assembly
7.2 Measuring assembly
7.3 Radioactive stability check device
8 Accompanying documents
Annex A (informative) Combined standard uncertainty for dosimeter performance [Go to Page]
Table A.1 – Estimation of combined standard uncertainty for dosimeter performance
Bibliography
Index of defined terms [Go to Page]

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BS EN IEC 61674:2024 Medical electrical equipment. Dosimeters with ionization chambers and/or semiconductor detectors as used in X-ray diagnostic imaging, 2024

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