IEC 62467-1 : 1.0

MEDICAL ELECTRICAL EQUIPMENT - DOSIMETRIC INSTRUMENTS AS USED IN BRACHYTHERAPY - PART 1: INSTRUMENTS BASED ON WELL-TYPE IONIZATION CHAMBERS

International Electrotechnical Committee

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FOREWORD INTRODUCTION 1 Scope and object 2 Normative references 3 Terms and definitions 4 General requirements   4.1 PERFORMANCE REQUIREMENTS   4.2 MEASURING ASSEMBLY   4.3 Source types       4.3.1 General       4.3.2 Beta particle-emitting sources       4.3.3 Low-energy-photon-emitting sources   4.4 Quantity to be measured   4.5 Reference and STANDARD TEST CONDITIONS   4.6 General test conditions       4.6.1 STANDARD TEST CONDITIONS       4.6.2 STABILIZATION TIME       4.6.3 Adjustments during test       4.6.4 Batteries   4.7 Constructional requirements as related to performance       4.7.1 General       4.7.2 Components       4.7.3 Display       4.7.4 Inserts       4.7.5 STABILIZATION TIME   4.8 Test of components 5 Limits of performance characteristics   5.1 Position of source in insert and repeatability   5.2 USABLE LENGTH   5.3 RESOLUTION OF THE DISPLAY   5.4 STABILIZATION TIME   5.5 LEAKAGE CURRENT       5.5.1 In AIR KERMA STRENGTH measuring mode       5.5.2 In charge measuring mode   5.6 Stability       5.6.1 Long term stability       5.6.2 MANUFACTURER method to check long term stability 6 LIMITS OF VARIATION for effects of influence quantities   6.1 General   6.2 IONIZATION CHAMBER - recombination losses   6.3 Operating voltage       6.3.1 Mains operated MEASURING ASSEMBLY       6.3.2 Battery operated MEASURING ASSEMBLY       6.3.3 Rechargeable MEASURING ASSEMBLY   6.4 Air pressure   6.5 Change of air pressure and EQUILIBRATION TIME       of the radiation detector       6.5.1 VENTED WELL TYPE IONIZATION CHAMBERS       6.5.2 SEALED WELL TYPE IONIZATION CHAMBERS   6.6 Temperature and humidity   6.7 Length RESPONSE   6.8 Electromagnetic immunity 7 Marking   7.1 WELL-TYPE IONIZATION CHAMBER ASSEMBLY   7.2 MEASURING ASSEMBLY 8 ACCOMPANYING DOCUMENTS   8.1 General   8.2 Use of the instrument   8.3 Documentation Bibliography Index of defined terms

Abstract

Describes the performance and some related constructional requirements of WELL-TYPE IONIZATION CHAMBERS and associated measurement apparatus, as defined in Clause 3, intended for the determination of a quantity, such as AIR KERMA STRENGTH or REFERENCE AIR KERMA RATE in photon radiation fields or ABSORBED DOSE TO WATER at a depth, in photon and beta radiation fields used in BRACHYTHERAPY, after appropriate calibration for a given type of source.