The Iranian Journal of Radiation Research is published quarterly by the Novin Medical Radiation Institute. All articles published represent the opinions of the authors and do not reflect official policy of the Journal. All rights are reserved to the Iranian Journal of Radiation Research. No parts of the journal may be reproduced or transmitted in any form or any means, electronic or mechanical, including photocopying, recording, or via any storage or retrieval system, without written permission from the journal. All correspondence and subscription information requests should be addressed to the Senior Editor, Publication Office.