ISO/TS TECHNICAL SPECIFICATION 18090-1 First edition 2015-08-01 Radiological protection - Characteristics of reference pulsed radiation - Part 1: Photon radiation Radioprotection - Caractéristiques des champs de rayonnement pulsés de réference - Partie 1: Radiation de photons Reference number IS0/TS18090-1:2015(E) ISO CopyrhematioaOrganizationforStandadizatio @ IS0 2015 No reproo Not forR IS0/TS 18090-1:2015(E) COPYRIGHT PROTECTED DOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org @ IS0 2015 - All rights reserved IS0/TS 18090-1:2015(E) Contents Page Foreword ..iv Introduction. .. 1 Scope. ..1 2 Normative references 3 Terms and definitions ..2 4 Characteristics of reference pulsed radiation .5 4.1 General .5 4.2 Time-dependent air kerma rate characteristics of the radiation pulse .5 4.2.1 Requirements ..5 4.2.2 Methodoftest .6 4.2.3 Interpretation of the results 7 4.3 Time-dependent high voltage characteristics of the radiation pulse 7 4.3.1 Requirement 7 4.3.2 Method of test .7 4.3.3 Interpretation of the results 7 4.4 Space dependent air kerma characteristics of the radiation pulse. .7 4.4.1 Reguirementonfielduniformityacrossthebeamarea .7 4.4.2 Method of test 7 4.4.3 Interpretation of the results .8 4.5 Filtration. .8 4.6 Equivalence of measured radiation pulse and trapezoidal pulse .8 4.6.1 Requirements 8 4.6.2 Method of test. .8 4.6.3 Interpretation of the results .8 4.7 Constancy of air kerma rate during the pulse plateau time. 9 4.7.1 Requirement .9 4.7.2 Method of test. 9 4.7.3 Interpretation of results 9 5 Dosimetry of pulsed reference radiation 11 5.1 General requirements on the instrument 11 5.2 Air kerma rate dependence of the instrument response 11 5.2.1 General. 11 5.2.2 Requirement. 11 5.2.3 Method of test and interpretation of the results 11 5.3 Size of the sensitive volume of the instrument .12 5.4 Airkermaoftheradiationpulse .12 5.5 Dose equivalent of the radiation pulse. .12 5.6 Radiation pulse air kerma rate. .12 5.7 Radiation pulse dose equivalent rate .12 Annex A (informative) Diode-detector and associated amplifier. ..13 Annex B (informative) Determination of the equivalent trapezoid radiation pulse ..15 Bibliography ..17 ii ed without license from IHS NotforF