1、BRITISH STANDARD BS EN 61331-2:2002 Incorporating Amendment No. 1 to BS 7817-2:1995 (renumbers the BS as BS EN 61331-2:2002) and incorporating Amendment No. 1 to BS EN 61331-2:2002 Protective devices against diagnostic medical X-radiation Part 2: Specification for protective glass plates BS EN 61331
2、-2:2002 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1995 BSI 25 November 2002 The following BSI references relate to the work on this standard: Co
3、mmittee reference HCC/74 Draft announced in BSI News April 1995 ISBN 0 580 24195 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee HCC/74, Radiation protection, upon which the following bodies were represented: Associatio
4、n of X-ray Equipment Manufacturers (BEAMA Ltd.) British Dental Association British Institute of Radiology British Medical Association College of Radiographers Department of Health Flat Glass Manufacturers Association Health and Safety Executive Industrial Safety (Protective Equipment) Manufacturers
5、Association Institute of Physical Sciences in Medicine (Ipsm) Ministry of Defence National Radiological Protection Board Royal College of Radiologists Society of X-ray Technology Amendments issued since publication Amd. No. Date Comments 13969 25 November 2002 Renumbers BS 7817-2:1995 as BS EN 61331
6、-2:2002 and adds Annex ZABS EN 61331-2:2002 BSI 25 November 2002 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and object 3 2 Normative references 3 3T e r m i n o l o g y 3 4D i m e n s i o n s 4 5 Geometrical accuracy of PROTECTIVE GLASS PLATES 5 6 Optical
7、quality of material 6 7 Transmittance 6 8A TTENUATION properties 7 9M a r k i n g 7 10 ACCOMPANYING DOCUMENTS 8 11 Statement of compliance 8 Annex A (normative) Index of defined terms 9 Annex ZA (normative) Normative references to international publications with their corresponding European publicat
8、ions 10 Table 1 Thickness of PROTECTIVE GLASS PLATES 4 Table 2 PROTECTIVE GLASS PLATES Nominal plane dimensions and tolerances 5 Table 3 Minimum values of ATTENUATION EQUIVALENT 7BS EN 61331-2:2002 ii BSI 25 November 2002 National foreword This British Standard is the official English language versi
9、on of EN 61331-2:2002. It is identical with IEC 61331-2:1994. The UK participation in its preparation was entrusted to Technical Committee HCC/74, Radiation protection, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.
10、 Additional information The following print types are used in this standard: For the purposes of this British Standard, any references to IEC page numbers in the text should be ignored. Cross-references The British Standards which implement international or European publications referred to in this
11、document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contr
12、act. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals fo
13、r change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Terms defined in BS 6641: SMALL CAPITALS. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to
14、10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61331-2 April 2002 ICS 11.040.50 English version Protective devices against diagnostic medical X-radiation P
15、art 2: Protective glass plates (IEC 61331-2:1994) Dispositifs de protection radiologique contre les rayonnements X pour diagnostic mdical Partie 2: Plaques en verre de protection radiologique (CEI 61331-2:1994) Strahlenschutz in der medizinischen Rntgendiagnostik Teil 2: Bleiglasscheiben (IEC 61331-
16、2:1994) This European Standard was approved by CENELEC on 2001-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogr
17、aphical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility o
18、f a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembo
19、urg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 B
20、russels 2002 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61331-2:2002 EEN 61331-2:2002 BSI 25 November 2002 2 Foreword The text of the International Standard IEC 61331-2:1994, prepared by IEC TC 62, Electrical equipment in medic
21、al practice, was submitted to the CENELEC Unique Acceptance Procedure and was approved by CENELEC as EN 61331-2 on 2001-12-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENE
22、LEC. Endorsement notice The text of the International Standard IEC 61331-2:1994 was approved by CENELEC as a European Standard without modification. latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-12-01
23、 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-12-01EN 61331-2:2002 BSI 25 November 2002 3 1 Scope and object 1.1 Scope This part of International Standard IEC 61331 applies to PROTECTIVE GLASS PLATES for use in RADIOLOGICAL EQUIPMENT or in RADIO
24、LOGICAL INSTALLATIONS where an optical transmission of visual images, TYPE SC, or other kind of viewing, type VI, through PROTECTIVE SHIELDING is to be realized. It does not cover other transparent RADIATION PROTECTION materials, e.g. plastic transparent protection plates (lead acrylate plastics); l
25、eaded glasses or goggles for protection of the OPERATORS eyes (eye spectacles); leaded face shields, which cover the entire face of the OPERATOR; PATIENT eye protection; and thyroid/neck PROTECTIVE DEVICES. 1.2 Object This part 2 deals with the requirements on: geometrical accuracy; optical quality
26、of the material; spectral transmittance; radiation ATTENUATION properties; marking; statement of compliance with this standard of PROTECTIVE GLASS PLATES. In addition, for PROTECTIVE GLASS PLATES TYPE SC, it gives certain nominal sizes, dimensions and tolerances. 2 Normative references The following
27、 normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International S
28、tandard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60788:1984, Medical radiology Terminology. IEC 61331-1:1994, Protective dev
29、ices against diagnostic medical X-radiation Part 1: Determination of attenuation properties of materials. 3 Terminology 3.1 degree of requirements in this part of the International Standard, certain terms (which are not printed in SMALL CAPITALS) have particular meanings, as follows: “shall” indicat
30、es a requirement that is mandatory for compliance; “should” indicates a strong recommendation that is not mandatory for compliance; “may” indicates a permitted manner of complying with a requirement or of avoiding the need to comply; “specified” is used to indicate definitive information stated by t
31、he MANUFACTURER in ACCOMPANYING DOCUMENTS or in other documentation relating to the equipment under consideration, usually concerning its intended purposes, or the parameters or conditions associated with its use or with testing to determine compliance.EN 61331-2:2002 4 BSI 25 November 2002 3.2 use
32、of terms in this part 2, terms printed in SMALL CAPITALS are used in accordance with their definitions in IEC 60788 and in subclause 3.3 of IEC 61331-2 (present publication) (see Annex A) 3.3 Defined terms 3.3.1 PROTECTIVE GLASS PLATE PROTECTIVE DEVICE of an optical quality suitable for transmitting
33、 visual images 3.3.2 PROTECTIVE GLASS PLATE TYPE SC PROTECTIVE GLASS PLATE of high optical quality with specified ATTENUATION properties used in DIRECT RADIOSCOPY for observation of the image in the FLUORESCENT SCREEN 3.3.3 PROTECTIVE GLASS PLATE TYPE VI PROTECTIVE GLASS PLATE of low optical quality
34、 with specified ATTENUATION properties used to provide optically clear and transparent PROTECTIVE SHIELDING. 4 Dimensions 4.1 Thickness of PROTECTIVE GLASS PLATES PROTECTIVE GLASS PLATES shall have a nominal thickness according to one of the values and their tolerances permitted, as given in Table 1
35、. Table 1 Thickness of PROTECTIVE GLASS PLATES 4.2 Plane dimensions of PROTECTIVE GLASS PLATES 4.2.1 Except for nominal plane dimensions referring to IMAGE RECEPTION AREAS in imperial units (inches), nominal plane dimensions shall correspond to values of full centimetres. 4.2.2 For PROTECTIVE GLASS
36、PLATES TYPE SC nominal plane dimensions should correspond to one of the values of Table 2. Nominal thickness Maximum thickness Minimum thickness cm mm mm 0,5 5,0 3,5 0,65 6,5 5,0 0,75 7,5 6,0 0,85 8,5 7,0 1,0 10 8,5 1,2 12 10 1,45 14,5 12,5 1,8 18 16 2,5 25 23EN 61331-2:2002 BSI 25 November 2002 5 T
37、able 2 PROTECTIVE GLASS PLATES Nominal plane dimensions and tolerances NOTE The values of Table 2 correspond to metric nominal sizes for radiographic INTENSIFYING SCREENS (IEC 60658 1) ) table of dimensions, which sizes are foreseen to form also the basis for the choice of sizes for RADIOGRAPHIC FIL
38、MS (ISO 4090 2) ) and RADIOGRAPHIC CASSETTES (IEC 60406 3) ). 4.3 Designation of nominal sizes The nominal size shall be designated by the dimensionless value of nominal thickness in cm and the dimensionless value of width and length in centimetres, e.g.: 0,85 30 40 5 Geometrical accuracy of PROTECT
39、IVE GLASS PLATES 5.1 Squareness The perimeter of a PROTECTIVE GLASS PLATE TYPE SC shall be between the perimeters of two perfect rectangles one made to the minimum dimensional tolerance permitted and one to the maximum tolerance. 5.2 Flatness All points on the two surfaces of PROTECTIVE GLASS PLATES
40、 TYPE SC and PROTECTIVE GLASS PLATES TYPE VI shall be contained between two parallel planes separated by the specified nominal thickness. For each of the two surfaces of PROTECTIVE GLASS PLATES TYPE SC and PROTECTIVE GLASS PLATES TYPE VI all points, along any length of 100 mm, shall be contained bet
41、ween two parallel planes 0,2 mm apart. 5.3 Parallelism The surfaces of PROTECTIVE GLASS PLATES shall be parallel to each other so that the optical deviation of light incident perpendicularly to a surface will not exceed: 0,003 radians for PROTECTIVE GLASS PLATES TYPE SC; and 0,006 radians for PROTEC
42、TIVE GLASS PLATES TYPE VI. 5.4 Narrow sides Each surface at the four narrow sides of PROTECTIVE GLASS PLATES TYPE SC shall be within half the tolerance for the corresponding plane dimension (see 4.2 and Table 2) and perpendicular to the plane surfaces of the plate to within 5 . 5.5 Edges The edges o
43、f PROTECTIVE GLASS PLATES TYPE SC shall be chamfered so that the chamfer is not smaller than 1 mm 45 when it is related to half the maximum permissible plane dimension and is not greater than 1 mm 45 when it is related to half the minimum permissible. Nominal area Width Tolerances Length Tolerances
44、cm cm mm mm mm mm 24 24 235 235 24 30 235 295 30 30 295 295 30 40 295 395 35 35 351 351 40 40 395 395 1) IEC 60658:1979, Radiographic intensifying screens for medical use Dimensions 2) ISO 4090:1991, Photography Film dimensions Medical radiography 3) IEC 60406:1975, Radiographic cassettes 0 2 0 2EN
45、61331-2:2002 6 BSI 25 November 2002 6 Optical quality of material 6.1 Definition of zones for determining homogeneity Zone A: Rectangular zone in the centre of the plate having dimensions: equal to half the width and half the length of the full plate; or 150 mm over the width and 150 mm over the len
46、gth whichever is the larger area. Zone C: Margin of 15 mm inside the perimeter. Zone B: Remaining zone between zone A and zone C. 6.2 Bubbles The inhomogeneity of PROTECTIVE GLASS PLATES TYPE SC shall not exceed the following limits: In zone A: there shall be no bubble of a diameter exceeding 0,5 mm
47、; the product of the number of bubbles and the diameter of the greatest bubble shall not exceed 1,2 mm. In zone B: there shall be no bubble of a diameter exceeding 0,7 mm; the product of the number of bubbles and the diameter of the greatest bubble shall not be greater than 2,4 multiplied by the rat
48、io of the area of zone B to that of zone A. In zone C: there shall be no bubble of a diameter exceeding 1 mm; the product of the number of bubbles and the diameter of the greatest bubble shall not exceed 4 mm. 6.3 Streaks and other inhomogeneities In zones A and B of PROTECTIVE GLASS PLATES TYPE SC
49、there shall be no streaks or other inhomogeneities which can be seen when a test screen consisting of a black and white striped pattern is viewed at a distance of approximately 3 m through the PROTECTIVE GLASS PLATE which is 250 mm in front of the observer. The width of each of the black and white stripes on the test screen shall be 10 mm. The pattern shall be illuminated to appr
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