1、 IEC 62467-1Edition 1.0 2009-06INTERNATIONAL STANDARD NORME INTERNATIONALEMedical electrical equipment Dosimetric instruments as used in brachytherapy Part 1: Instruments based on well-type ionization chambers Appareils lectromdicaux Instruments de dosimtrie utiliss en curiethrapie Partie 1: Instrum
2、ents conus pour les chambres dionisation puits IEC62467-1:2009 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechani
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16、n ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62467-1Edition 1.0 2009-06INTERNATIONAL STANDARD NORME INTERNATIONALEMedical electrical equipment Dosimetric instruments as used in brachytherapy Par
17、t 1: Instruments based on well-type ionization chambers Appareils lectromdicaux Instruments de dosimtrie utiliss en curiethrapie Partie 1: Instruments conus pour les chambres dionisation puits INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE TICS 11.040.50; 11.040
18、60 PRICE CODECODE PRIXISBN 2-8318-1045-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 62467-1 IEC:2009 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope and object7 2 Normative references .7 3 Terms and definitions .8
19、 4 General requirements.12 4.1 PERFORMANCE REQUIREMENTS.12 4.2 MEASURING ASSEMBLY 12 4.3 Source types .12 4.3.1 General .12 4.3.2 Beta particle-emitting sources .13 4.3.3 Low-energy-photon-emitting sources .13 4.4 Quantity to be measured .13 4.5 Reference and STANDARD TEST CONDITIONS 13 4.6 General
20、test conditions13 4.6.1 STANDARD TEST CONDITIONS13 4.6.2 STABILIZATION TIME .13 4.6.3 Adjustments during test .14 4.6.4 Batteries14 4.7 Constructional requirements as related to performance .14 4.7.1 General .14 4.7.2 Components 14 4.7.3 Display 14 4.7.4 Inserts .14 4.7.5 STABILIZATION TIME .14 4.8
21、Test of components.15 5 Limits of performance characteristics15 5.1 Position of source in insert and repeatability .15 5.2 USABLE LENGTH 15 5.3 RESOLUTION OF THE DISPLAY .15 5.4 STABILIZATION TIME.15 5.5 LEAKAGE CURRENT16 5.5.1 In AIR KERMA STRENGTH measuring mode16 5.5.2 In charge measuring mode 16
22、 5.6 Stability.16 5.6.1 Long term stability .16 5.6.2 MANUFACTURER method to check long term stability .16 6 LIMITS OF VARIATION for effects of influence quantities .16 6.1 General .16 6.2 IONIZATION CHAMBER recombination losses 17 6.3 Operating voltage17 6.3.1 Mains operated MEASURING ASSEMBLY 17 6
23、3.2 Battery operated MEASURING ASSEMBLY 17 6.3.3 Rechargeable MEASURING ASSEMBLY.18 6.4 Air pressure.18 6.5 Change of air pressure and EQUILIBRATION TIME of the radiation detector .18 62467-1 IEC:2009 3 6.5.1 VENTED WELL TYPE IONIZATION CHAMBERS 18 6.5.2 SEALED WELL TYPE IONIZATION CHAMBERS.19 6.6
24、Temperature and humidity.19 6.7 Length RESPONSE 19 6.8 Electromagnetic immunity20 7 Marking 20 7.1 WELL-TYPE IONIZATION CHAMBER ASSEMBLY20 7.2 MEASURING ASSEMBLY 20 8 ACCOMPANYING DOCUMENTS.20 8.1 General .20 8.2 Use of the instrument 20 8.3 Documentation 21 Bibliography22 Index of defined terms 23
25、Table 1 REFERENCE and STANDARD TEST CONDITIONS.13 Table 2 LIMITS OF VARIATION for the effects of INFLUENCE QUANTITIES.17 4 62467-1 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MEDICAL ELECTRICAL EQUIPMENT DOSIMETRIC INSTRUMENTS AS USED IN BRACHYTHERAPY Part 1: Instruments based on well-type
26、ionization chambers FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning st
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33、quipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees an
34、d IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) A
35、ttention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights
36、 IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62467-1 has been prepared by subcommittee 62C, Equipment for radiotherapy, nuclear medicine and radiation dosimetry, of IEC technical committee 62, Electrical equipment in medical practice.
37、The text of this standard is based on the following documents: FDIS Report on voting 62C/460/FDIS 62C/468/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the I
38、SO/IEC Directives, Part 2. 62467-1 IEC:2009 5 A list of all parts of the IEC 62467 series, published under the general title Medical electrical equipment Dosimetric instruments as used in brachytherapy, can be found on the IEC website. In this standard the following print types are used: Requirement
39、s, compliance with which can be tested, and definitions: in roman type; notes, explanations, advice, general statements and exceptions: in small roman type; test specifications: in italic type; TERMS USED THROUGHOUT THIS STANDARD THAT HAVE BEEN DEFINED IN CLAUSE 3 OR IN THE PUBLICATIONS INDICATED IN
40、 THE INDEX OF DEFINED TERMS: IN SMALL CAPITALS. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publi
41、cation will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 62467-1 IEC:2009 INTRODUCTION The wide range of WELL-TYPE IONIZATION CHAMBER instruments currently being used for BRACHYTHERAPY sources indicates the need for a standard for uniformity in measurement and test techniq
42、ues for WELL-TYPE IONIZATION CHAMBER instruments. Measurements of the output of BRACHYTHERAPY sources have distinct requirements that differ from the assay of sources used in diagnostic nuclear medicine. This translates into the requirements for the measurement devices. Many times similar instrument
43、ation is used for both applications; however, there are tighter requirements for those instruments used for BRACHYTHERAPY sources. Such devices are composite systems consisting of an IONIZATION CHAMBER, either integrally coupled or connected to appropriate electronic circuitry that converts the ioni
44、zation current to a readout, which can be converted to a quantity appropriate to the source being measured. The ionization current produced can be either read directly or as accumulated charge (current integrated over time) and then converted manually to the appropriate quantity, AIR KERMA STRENGTH
45、REFERENCE AIR KERMA RATE) or ABSORBED DOSE TO WATER. The principles of operation of the IONIZATION CHAMBER are well known and are not repeated here. In addition, the readout device many times also has application to therapy uses and is well known. Although this standard is written using the quantit
46、y AIR KERMA STRENGTH, the principles are the same for other quantities such as REFERENCE AIR KERMA RATE. In principle the quantity measured is the dose volume integral from which under specified conditions the dose quantities AIR KERMA STRENGTH, REFERENCE AIR KERMA RATE, or ABSORBED DOSE TO WATER at
47、 a depth can be deduced. The signal produced by the chamber is the electrical current or charge, which is to be measured with an electrometer meeting criteria according to IEC 60731. The current or charge is converted to the dosimetric quantity of interest by means of a source type specific CALIBRAT
48、ION FACTOR. 62467-1 IEC:2009 7 MEDICAL ELECTRICAL EQUIPMENT DOSIMETRIC INSTRUMENTS AS USED IN BRACHYTHERAPY Part 1: Instruments based on well-type ionization chambers 1 Scope and object This part of IEC 62467 specifies the performance and some related constructional requirements of WELL-TYPE IONIZAT
49、ION 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. This International Standard cove
