INTERNATIONAL ISO/ASTM STANDARD 51818 Fourth edition 2020-06 Practice for dosimetry in an electron beam facility for radiation processing at energies between 80 and 300 keV Pratique de la dosimetrie dans une installation de traitement par irradiation utilisant un faisceau d'électrons d'energies comprises entre80et300keV Reference number IS0/ASTM51818:2020(E) [so INTERNATIONAL @IS0/ASTMInternational2020 IS0/ASTM 51818:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS0/ASTM International 2020 reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on or ISO's member body in the country of the requester. In the United States, such requests should be sent to ASTM International. ISO copyright office ASTM International CP401·Ch.de Blandonnet8 100 Barr Harbor Drive, PO Box C700 CH-1214 Vernier, Geneva West Conshohocken,PA19428-2959,USA Phone: +41 22 749 01 11 Phone: +610 832 9634 Fax: +610 832 9635 Email: copyright@iso.org Email: khooper@astm.org Website: www.iso.org Website: www.astm.org Published in Switzerland i ISO/ASTM International 2020-Allrights reserved ISO/ASTM51818:2020(E) Contents Page 1 1 2 Referenced documents 2 2 3 Terminology Significance and use.... 4 3 Selection and calibration of the dosimetry system, 3 5 Installation and operationalqualification. 4 6 Performance qualification.. 5 7 8 Routineprocess control. 5 Measurement uncertainty. 5 10 Documentation .... 5 Keywords 6 11 Annexes 6 Figure A1.1 speedVandbeamwidthWp.Measuredatan electronacceleratorwithbeamenergy11okeV. K = 216.57 (kGy . m) / (A · s) .......... 7 Figure A1.2 Example of beam width measurement (3 measurements and their average are shown).Beam width was measured on alow-energy accelerator installed in an electron beam tunnel foran aseptic filling line (3) 7 Figure A1.3 Exampleofbeam widthmeasurementata low-energyelectronacceleratorfacilityfor curingpurpose.. 8 Figure A1.4 Calculated depth-dose distribution in water (specific density 1 g cm 8 Figure A1.5 Calculated depth-dose distribution in water (specific density 1 g cm 6 Figure A1.6 Methods for measurement of depth-dose distribution .... 6 Figure A1.7 Examplesofmeasurementsofdepth-dosedistributionsatthesameelectronbeam facility, but at different beam energies ... 10 Figure A2.1 Apparent dose measured with three dosimeters (18 μm RCD film dosimeter (1.12 g cm*3); 50 μm RCD film dosimeter (1.15 g cm*3); 130 μm alanine film dosimeter (1.36 g cm3) all calibrated by irradiation at a 10MeV electron accelerator, and now irradiated at a116 kev electronaccelerator... 11 @ ISO/ASTM International 2020 - All rights reserved ili