BS ISO BRITISH STANDARD 7004:2002 Photography - Industrial radiographic films Determination of ISO speed, ISO average gradient and ISO gradients G2 and G4 when exposed to X- and gamma-radiation ICS 37.040.25 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW British Standards BS IS07004:2002 National foreword This British Standard reproduces verbatim IS0 7004:2002 and implements it as the UK national standard. It supersedes BS ISO 7004:1987 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this 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 contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having Summary of pages been prepared under the This document comprises a front cover, an inside front cover, the ISO title page, direction of the Consumer pages ii to v, a blank page, pages 1 to 18, an inside back cover and a back cover. Products and Services Sector PolicyandStrategyCommittee, The BSI copyright date displayed in this document indicates when the was published under the authority of the Standards document was last issued. Policy and Strategy Committee on16October2002 Amendments issued since publication Amd. No. Date Comments BSI 16 October 2002 ISBN 0 580 40553 2 BS ISO. 7004:2002 INTERNATIONAL ISO STANDARD 7004 Second edition 2002-10-01 Photography Industrial radiographic films Determination of ISO speed, ISO average gradient and ISO gradients G2 and G4 when exposed to X- and gamma-radiation PhotographieFilms pour radiographie industrielleDetermination de la sensibilité ISO, du contraste moyen ISO et des contrastes ISO G2 et G4 apres exposition a des rayons X ou gamma Reference number ISO 7004:2002(E) ISO BS ISO 7004:2002 ii BS ISO. 7004:2002 Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Samplingandstorage 5 Method of test 5.1 Principle. 5.2 Safelights. 5.3 Exposure 5.4 Processing 5.5 Densitometry 5.6 Evaluation. 6 Product classification 6.1 Speed calculation ... 6.2 Average gradient calculation 6.3 Point gradient determination. 6.4 Uncertainty 10 7 Marking and labelling . 7.1 Isospeed.. 7.2 ISo average gradient. 7.3 ISO gradients G2 and G4. 7.4 General .... 11 Annex A (informative) Units of measured energy. 12 Annex B (informative)Scattered radiation measurement. Annex C (informative) Calibration of ionization chambers. Annex D (informative)Improvement of the reproducibility of measurement of X-radiation .. Annex E (informative) Derivation of the relationship used in the determination of G2 and G4.. Annex F (informative) Radiation quality code..... Bibliography.... ili BS ISO 7004:2002 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3 Draft International Standards adopted by